Devuan logs - #617, boring messages

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Subject: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Reply-To: Martin Steigerwald <[email protected]>, [email protected]
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From: Martin Steigerwald <[email protected]>
To: Devuan Bug Tracking System <[email protected]>
Message-ID: <[email protected]>
Date: Mon, 11 Oct 2021 18:19:24 +0200

Package: initscripts
Version: 2.96-7+devuan1
Severity: normal
X-Debbugs-Cc: [email protected]

Just updated Devuan Ceres today and found the display being blanked during
the boot process. I was able to recover over SSH using

% brightnessctl
Device 'intel_backlight' of class 'backlight':
        Current brightness: 0 (0%)
        Max brightness: 512

% brightnessctl set 100%
Updated device 'intel_backlight':
Device 'intel_backlight' of class 'backlight':
        Current brightness: 512 (100%)
        Max brightness: 512

Yet running '/etc/init.d/brightness start' blanked the display again. This
is due to:

% cat /var/lib/initscripts/brightness.intel
0

I have no idea how this value got into this file. The display was certainly
not at 0% brightness as I rebooted after the update.

Expected result:

Never ever blank the display on boot even in case
'/var/lib/initscripts/brightness.intel' contains the value zero.

Just don't.

Expected result 2:

Safe the right value to '/var/lib/initscripts/brightness.intel'. Zero is
definitly not it.

If I run:

% echo 512 > /var/lib/initscripts/brightness.intel
% /etc/init.d/brightness start

After sending this bug report I will reboot and see whether it will remember
this value. Otherwise I will 'chattr +i' this file for now.

This is on a ThinkPax X260 with Intel on board graphics from
Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz CPU.

Thanks,
Martin

-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 4 (daedalus/ceres)
Release:	5
Codename:	daedalus/ceres
Architecture: x86_64

Kernel: Linux 5.14.0-2-amd64 (SMP w/4 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: runit (via /run/runit.stopit)
LSM: AppArmor: enabled

Versions of packages initscripts depends on:
ii  lsb-base  11.1.0
ii  sysv-rc   2.96-7+devuan1

Versions of packages initscripts recommends:
ii  e2fsprogs  1.46.4-1
ii  psmisc     23.4-2

initscripts suggests no packages.

-- no debconf information

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X-Loop: [email protected]
From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617: Acknowledgement (initscripts: brightness init script
 sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack 617
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Reply-To: [email protected]
Date: Mon, 11 Oct 2021 16:22:06 +0000

Thank you for filing a new bug report with Devuan.

You can follow progress on this bug here: 617: https://bugs.devuan.org/cgi/=
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Subject: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Reply-To: Mark Hindley <[email protected]>, [email protected]
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Date: Mon, 11 Oct 2021 18:06:44 +0100
From: Mark Hindley <[email protected]>
To: Martin Steigerwald <[email protected]>, [email protected]
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Martin,

Thanks for this.

The brightness initscript seems to save
/sys/class/backlight/intel_backlight/brightness to
/var/lib/initscripts/brightness when it is stopped.

On your system, what does the /sys/class/backlight/intel_backlight/brightness
contain?

Mark

Message sent to [email protected], Devuan Developers <[email protected]>:

Subject: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Reply-To: Martin Steigerwald <[email protected]>, [email protected]
Resent-From: Martin Steigerwald <[email protected]>
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References: <[email protected]> <[email protected]> <[email protected]>
From: Martin Steigerwald <[email protected]>
To: [email protected], Mark Hindley <[email protected]>
Date: Mon, 11 Oct 2021 22:19:22 +0200
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Dear Mark.

Mark Hindley - 11.10.21, 19:06:44 CEST:
> The brightness initscript seems to save
> /sys/class/backlight/intel_backlight/brightness to
> /var/lib/initscripts/brightness when it is stopped.
>=20
> On your system, what does the
> /sys/class/backlight/intel_backlight/brightness contain?

I can check tomorrow again. However=E2=80=A6 after I wrote "512" to the
"/var/lib/initscripts/brightness" file, brightness is set correctly after=20
reboot. So I am not sure I can reproduce the original condition after=20
the update anymore.

So or so, I think it would be good to ensure a minimum brightness level,=20
as a completely blank display can only be fixed with a live Linux, SSH=20
access or some other out of band management access.

Best,
=2D-=20
Martin

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From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <1706830.h0UYPgaZyk@ananda>
X-Devuan-PR-Message: ack-info 617
X-Devuan-PR-Package: initscripts
Reply-To: [email protected]
Date: Mon, 11 Oct 2021 20:22:05 +0000

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From: Martin Steigerwald <[email protected]>
To: [email protected], Mark Hindley <[email protected]>
Date: Tue, 12 Oct 2021 09:36:24 +0200
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Dear Mark.

Mark Hindley - 11.10.21, 19:06:44 CEST:
> Thanks for this.
>=20
> The brightness initscript seems to save
> /sys/class/backlight/intel_backlight/brightness to
> /var/lib/initscripts/brightness when it is stopped.
>=20
> On your system, what does the
> /sys/class/backlight/intel_backlight/brightness contain?

I think I know what happened.

After booting the laptop I get:

% cat /sys/class/backlight/intel_backlight/brightness
512

However after KDE Plasma blanked the screen due to inactivity I got:

% cat /sys/class/backlight/intel_backlight/brightness
0

Now when I shutdown the system regularly using the GUI, Plasma would=20
raise the brightness again as I move the mouse pointer. However, when I=20
reboot from SSH as I did yesterday after the update, it won't.

The script takes writes zero into its state file and that it is.

Due to that I think the whole assumption that it is a sane idea to=20
restore the backlight state to what has been set at the time of=20
rebooting is fundamentally broken.

Actually it was one of the reasons why I switched from systemd to runit.=20
Cause at one point Systemd in Debian was configured to do something=20
similar and it causes some of my machines to boot up with blank and at a=20
later at least very dark display.

Of course you may argue not to reboot a desktop machine via SSH. But why=20
wouldn't I do so for my music player laptop?

I do not have a good idea on how to fix this issue at the moment. A work-
around would be to ensure a minimum brightness of at least 10% or 20%.=20
Another idea would be to tell the desktop environment to unblank the=20
screen before logging off or ask the desktop environment developers to do=20
so in all cases. Or you'd just use say 80% of brightness as a default=20
value and put a file into /etc to let the user manually configure it.

The best solution would be to somehow grab the *intended* brightness=20
value during operation and not ever take the one during inactivity where=20
the screen is blanked. But also this depends on the desktop environment.=20
So=E2=80=A6 it is likely to become messy and complex.

My personal work-around for now will likely be to disable the stop=20
operation of that script.

Best,
=2D-=20
Martin

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From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <3683879.6dGg56flLl@ananda>
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Date: Tue, 12 Oct 2021 07:42:03 +0000

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Martin,

Thanks for your analysis. At least that makes sense, even if a clean solution is
not immediately obvious.

Creating and artificial minimum seems rather arbitrary and would a minimum of,
say, 20% of the maximum value even be sane and suitable on all hardware? I don't
have any suitable hardware for real testing, so would have to rely on reports
from you and others.

Getting all DEs to cooperate in unblanking seems a tall order.

I agree the script seems suboptimal in many ways.

Maybe we could support configuring a minimum in /etc/default/brightness?

At least you have a workaround that will avoid the issue for you again. If you
get any other ideas about clean fixes, do say.

Mark

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Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
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Hi,

Martin Steigerwald writes:

> Dear Mark.
>
> Mark Hindley - 11.10.21, 19:06:44 CEST:
>> The brightness initscript seems to save
>> /sys/class/backlight/intel_backlight/brightness to
>> /var/lib/initscripts/brightness when it is stopped.
>>
>> On your system, what does the
>> /sys/class/backlight/intel_backlight/brightness contain?
>
> I can check tomorrow again. However$B!D(B after I wrote "512" to the
> "/var/lib/initscripts/brightness" file, brightness is set correctly after
> reboot. So I am not sure I can reproduce the original condition after
> the update anymore.
>
> So or so, I think it would be good to ensure a minimum brightness level,
> as a completely blank display can only be fixed with a live Linux, SSH
> access or some other out of band management access.

Does this mean that even switching to the console (Ctrl-Alt-F1, etc)
doesn't give you a screen where can see what you're doing?

Just wondering,
--
Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
 GnuPG key: F84A2DD9/B3C0 2F47 EA19 64F4 9F13  F43E B8A4 A88A F84A 2DD9
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From: "Devuan bug Tracking System" <[email protected]>
To: Olaf Meeuwissen <[email protected]>
Subject: bug#617: Info received ([devuan-dev] bug#617: initscripts:
 brightness init script sets brightness to zero, thus blanking laptop
 display)
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From: Martin Steigerwald <[email protected]>
To: [email protected], devuan developers internal list <[email protected]>, Olaf Meeuwissen <[email protected]>
Cc: Mark Hindley <[email protected]>
Date: Tue, 12 Oct 2021 16:52:32 +0200
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Olaf Meeuwissen - 12.10.21, 13:14:17 CEST:
> Hi,
>=20
> Martin Steigerwald writes:
> > Dear Mark.
> >=20
> > Mark Hindley - 11.10.21, 19:06:44 CEST:
> >> The brightness initscript seems to save
> >> /sys/class/backlight/intel_backlight/brightness to
> >> /var/lib/initscripts/brightness when it is stopped.
> >>=20
> >> On your system, what does the
> >> /sys/class/backlight/intel_backlight/brightness contain?
> >=20
> > I can check tomorrow again. However=E2=80=A6 after I wrote "512" to the
> > "/var/lib/initscripts/brightness" file, brightness is set correctly
> > after reboot. So I am not sure I can reproduce the original
> > condition after the update anymore.
> >=20
> > So or so, I think it would be good to ensure a minimum brightness
> > level, as a completely blank display can only be fixed with a live
> > Linux, SSH access or some other out of band management access.
>=20
> Does this mean that even switching to the console (Ctrl-Alt-F1, etc)
> doesn't give you a screen where can see what you're doing?

Yes. I tried via Ctrl-Alt-F1 on the laptop and via SSH with "chvt 1".=20
Nothing.

Ciao,
=2D-=20
Martin

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 brightness init script sets brightness to zero, thus blanking laptop
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On Tue, Oct 12, 2021 at 11:07:53AM +0100, Mark Hindley wrote:
> At least you have a workaround that will avoid the issue for you again. If you
> get any other ideas about clean fixes, do say.

Why not just refuse to *update* to 0 at shutdown.  It seems like 0 is a 
special case the user is fairly unlikely to have set it to themself (but 
if they do want 0 they are probably technical enough to update the 
setting file on their own).

-Jacob

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 brightness init script sets brightness to zero, thus blanking laptop
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Dear Mark, dear Jacob

Jacob Lundberg - 12.10.21, 19:19:50 CET:
> On Tue, Oct 12, 2021 at 11:07:53AM +0100, Mark Hindley wrote:
> > At least you have a workaround that will avoid the issue for you
> > again. If you get any other ideas about clean fixes, do say.
> 
> Why not just refuse to *update* to 0 at shutdown.  It seems like 0 is
> a special case the user is fairly unlikely to have set it to themself
> (but if they do want 0 they are probably technical enough to update
> the setting file on their own).

I think that would be a good idea.

I'd really welcome this after I "bricked" another device due to exactly 
this bug. I needed to put GRML to an USB stick and boot from there in 
order to recover.

Have a relaxing, quiet and peaceful time, a merry Christmas!

Best,
-- 
Martin

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 initscripts: brightness init script sets brightness to zero, thus blanking
 laptop display)
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Martin,

On Wed, Dec 22, 2021 at 11:19:17AM +0100, Martin Steigerwald wrote:
> I'd really welcome this after I "bricked" another device due to exactly 
> this bug. I needed to put GRML to an USB stick and boot from there in 
> order to recover.

How does the attached patch look? Are you able to test?

Thanks.

Mark

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	filename="0001-brightness-initscript-don-t-save-value-of-0-when-sto.patch"

From 0bbb9d27a673826a2fa2611c62913107a7809f88 Mon Sep 17 00:00:00 2001
From: Mark Hindley <[email protected]>
Date: Wed, 22 Dec 2021 11:42:29 +0000
Subject: [PATCH] brightness initscript: don't save value of 0 when stopping
 (Closes: #617).

Fix for Devuan #617.

Some DEs switch off the backlight when idle. If the box is rebooted remotely in
this state, 0 is copied to /var/lib/initscripts/brightness which causes a blank
display on reboot.
---
 debian/src/initscripts/etc/init.d/brightness | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/debian/src/initscripts/etc/init.d/brightness b/debian/src/initscripts/etc/init.d/brightness
index 2b4921f7..c1a5f1fd 100755
--- a/debian/src/initscripts/etc/init.d/brightness
+++ b/debian/src/initscripts/etc/init.d/brightness
@@ -67,6 +67,10 @@ do_stop() {
 	local label=$1 knob=$2 max=$3 file=$SAVEFILE_PREFIX${1:+.$1}
 	test -e "$knob" || return 0
 
+	# If the backlight is off, don't save to avoid blank display after
+	# reboot. See Devuan #617.
+	test "$(cat $knob)" -eq 0 && return 0
+
 	test x"$VERBOSE" = x"no" || \
 	    log_action_begin_msg Saving $label brightness level
 	cat "$knob" >"$file"
-- 
2.20.1


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Hi Mark.

Mark Hindley - 22.12.21, 12:47:55 CET:
> On Wed, Dec 22, 2021 at 11:19:17AM +0100, Martin Steigerwald wrote:
> > I'd really welcome this after I "bricked" another device due to
> > exactly this bug. I needed to put GRML to an USB stick and boot
> > from there in order to recover.
> 
> How does the attached patch look? Are you able to test?

The patch looks good to me. I think I am able to test it on one machine. 
May take some time though.

Best,
-- 
Martin

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From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <5898639.G1yRvuxQDs@ananda>
X-Devuan-PR-Message: ack-info 617
X-Devuan-PR-Package: initscripts
Reply-To: [email protected]
Date: Wed, 22 Dec 2021 15:44:05 +0000

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From: Martin Steigerwald <[email protected]>
To: Mark Hindley <[email protected]>
Cc: [email protected], Jacob Lundberg <[email protected]>
Date: Thu, 23 Dec 2021 14:47:19 +0100
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Mark,

Mark Hindley - 22.12.21, 12:47:55 CET:
> On Wed, Dec 22, 2021 at 11:19:17AM +0100, Martin Steigerwald wrote:
> > I'd really welcome this after I "bricked" another device due to
> > exactly this bug. I needed to put GRML to an USB stick and boot
> > from there in order to recover.
> 
> How does the attached patch look? Are you able to test?

I tested on a ThinkPad laptop with Intel graphics:

Without patch:

root@somehost:/var/lib/initscripts# cat brightness.intel 
512
root@somehost:/var/lib/initscripts# /etc/init.d/brightness stop
root@somehost:/var/lib/initscripts# cat brightness.intel 
0

With patch:

root@somehost:/var/lib/initscripts# echo 512 > brightness.intel 
root@somehost:/var/lib/initscripts# cat brightness.intel 
512

root@somehost:/var/lib/initscripts# /etc/init.d/brightness stop
root@somehost:/var/lib/initscripts# cat brightness.intel 
512

I think it should work.

Thanks,
-- 
Martin

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From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <4705134.hTFNdjQnqM@ananda>
X-Devuan-PR-Message: ack-info 617
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Date: Thu, 23 Dec 2021 13:50:05 +0000

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Martin,

On Thu, Dec 23, 2021 at 02:47:19PM +0100, Martin Steigerwald wrote:
> I think it should work.

Thanks.  I will build a new version over the next few days.

Mark

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From: "Devuan bug Tracking System" <[email protected]>
To: Mark Hindley <[email protected]>
Subject: bug#617: Info received (bug#617: initscripts: brightness init
 script sets brightness to zero, thus blanking laptop display)
Message-ID: <[email protected]>
References: <[email protected]>
X-Devuan-PR-Message: ack-info 617
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Date: Mon, 27 Dec 2021 11:22:04 +0000

Thank you for the additional information you have supplied regarding
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Control: tags -1 pending patch

Martin,

On Sun, Dec 26, 2021 at 09:56:07AM +0000, Mark Hindley wrote:
> Martin,
> 
> On Thu, Dec 23, 2021 at 02:47:19PM +0100, Martin Steigerwald wrote:
> > I think it should work.
> 
> Thanks.  I will build a new version over the next few days.

My apologies, this completely slipped my mind.

I have merged it for the next upload.

Mark

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From: Mark Hindley <[email protected]>
To: [email protected]
Cc: Martin Steigerwald <[email protected]>, Jacob Lundberg <[email protected]>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to
 zero, thus blanking laptop display
Message-ID: <[email protected]>
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Control: tags -1 pending patch

Martin,

On Sun, Dec 26, 2021 at 09:56:07AM +0000, Mark Hindley wrote:
> Martin,
> 
> On Thu, Dec 23, 2021 at 02:47:19PM +0100, Martin Steigerwald wrote:
> > I think it should work.
> 
> Thanks.  I will build a new version over the next few days.

My apologies, this completely slipped my mind.

I have merged it for the next upload.

Mark

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Your message dated Mon, 17 Apr 2023 10:21:13 +0000
with message-id <[email protected]>
and subject line #617: fixed in src:sysvinit version 3.06-4devuan3
has caused the Devuan bug report #617,
regarding initscripts: brightness init script sets brightness to zero, thus=
 blanking laptop display
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
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From: Martin Steigerwald <[email protected]>
To: Devuan Bug Tracking System <[email protected]>
Subject: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Message-ID: <[email protected]>
Date: Mon, 11 Oct 2021 18:19:24 +0200
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Package: initscripts
Version: 2.96-7+devuan1
Severity: normal
X-Debbugs-Cc: [email protected]

Just updated Devuan Ceres today and found the display being blanked during
the boot process. I was able to recover over SSH using

% brightnessctl
Device 'intel_backlight' of class 'backlight':
        Current brightness: 0 (0%)
        Max brightness: 512

% brightnessctl set 100%
Updated device 'intel_backlight':
Device 'intel_backlight' of class 'backlight':
        Current brightness: 512 (100%)
        Max brightness: 512

Yet running '/etc/init.d/brightness start' blanked the display again. This
is due to:

% cat /var/lib/initscripts/brightness.intel
0

I have no idea how this value got into this file. The display was certainly
not at 0% brightness as I rebooted after the update.

Expected result:

Never ever blank the display on boot even in case
'/var/lib/initscripts/brightness.intel' contains the value zero.

Just don't.

Expected result 2:

Safe the right value to '/var/lib/initscripts/brightness.intel'. Zero is
definitly not it.

If I run:

% echo 512 > /var/lib/initscripts/brightness.intel
% /etc/init.d/brightness start

After sending this bug report I will reboot and see whether it will remember
this value. Otherwise I will 'chattr +i' this file for now.

This is on a ThinkPax X260 with Intel on board graphics from
Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz CPU.

Thanks,
Martin

-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 4 (daedalus/ceres)
Release:	5
Codename:	daedalus/ceres
Architecture: x86_64

Kernel: Linux 5.14.0-2-amd64 (SMP w/4 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: runit (via /run/runit.stopit)
LSM: AppArmor: enabled

Versions of packages initscripts depends on:
ii  lsb-base  11.1.0
ii  sysv-rc   2.96-7+devuan1

Versions of packages initscripts recommends:
ii  e2fsprogs  1.46.4-1
ii  psmisc     23.4-2

initscripts suggests no packages.

-- no debconf information

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Date: Mon, 17 Apr 2023 10:21:13 +0000
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Version: 3.06-4devuan3

Source package sysvinit (3.06-4devuan3) added to Devuan suite unstable.

This closes bug report 617.

Thanks

DAK managing the Devuan archive

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Format: 1.8
Date: Mon, 17 Apr 2023 10:59:34 +0100
Source: sysvinit
Architecture: source
Version: 3.06-4devuan3
Distribution: unstable
Urgency: medium
Maintainer: Devuan Developers <[email protected]>
Changed-By: Mark Hindley <[email protected]>
Closes: 617
Changes:
 sysvinit (3.06-4devuan3) unstable; urgency=medium
 .
   * brightness initscript: don't save value of 0 when stopping (Closes: #617).
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Message sent:

MIME-Version: 1.0
X-Mailer: MIME-tools 5.509 (Entity 5.509)
X-Loop: [email protected]
From: "Devuan bug Tracking System" <[email protected]>
To: Martin Steigerwald <[email protected]>
Subject: bug#617 closed by [email protected] (#617: fixed in src:sysvinit
 version 3.06-4devuan3)
Message-ID: <[email protected]>
References: <[email protected]>
 <[email protected]>
X-Devuan-PR-Message: they-closed 617
X-Devuan-PR-Package: initscripts
X-Devuan-PR-Keywords: patch
X-Devuan-PR-Source: sysvinit
Reply-To: [email protected]
Date: Mon, 17 Apr 2023 10:24:07 +0000
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This is an automatic notification regarding your bug report
which was filed against the initscripts package:

#617: initscripts: brightness init script sets brightness to zero, thus bla=
nking laptop display

It has been closed by [email protected].

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact [email protected] by
replying to this email.


--=20
617: https://bugs.devuan.org/cgi/bugreport.cgi?bug=3D617
Devuan Bug Tracking System
Contact [email protected] with problems

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From: [email protected]
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Subject: #617: fixed in src:sysvinit version 3.06-4devuan3
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Date: Mon, 17 Apr 2023 10:21:13 +0000
Message-Id: <[email protected]>


Version: 3.06-4devuan3

Source package sysvinit (3.06-4devuan3) added to Devuan suite unstable.

This closes bug report 617.

Thanks

DAK managing the Devuan archive

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Mon, 17 Apr 2023 10:59:34 +0100
Source: sysvinit
Architecture: source
Version: 3.06-4devuan3
Distribution: unstable
Urgency: medium
Maintainer: Devuan Developers <[email protected]>
Changed-By: Mark Hindley <[email protected]>
Closes: 617
Changes:
 sysvinit (3.06-4devuan3) unstable; urgency=medium
 .
   * brightness initscript: don't save value of 0 when stopping (Closes: #617).
Checksums-Sha1:
 f91bac2caac34718b879f266ee583a3b5ab76f60 2008 sysvinit_3.06-4devuan3.dsc
 ccb9ab39513f07db02c9f292ae3e5d14d38ed4dd 135856 sysvinit_3.06-4devuan3.debian.tar.xz
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Files:
 1442d1b067dd85e06b9945b17de88c63 2008 admin required sysvinit_3.06-4devuan3.dsc
 be0b36355bf802c32b969cb897666a3f 135856 admin required sysvinit_3.06-4devuan3.debian.tar.xz
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From: Martin Steigerwald <[email protected]>
To: Devuan Bug Tracking System <[email protected]>
Subject: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Message-ID: <[email protected]>
Date: Mon, 11 Oct 2021 18:19:24 +0200
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Package: initscripts
Version: 2.96-7+devuan1
Severity: normal
X-Debbugs-Cc: [email protected]

Just updated Devuan Ceres today and found the display being blanked during
the boot process. I was able to recover over SSH using

% brightnessctl
Device 'intel_backlight' of class 'backlight':
        Current brightness: 0 (0%)
        Max brightness: 512

% brightnessctl set 100%
Updated device 'intel_backlight':
Device 'intel_backlight' of class 'backlight':
        Current brightness: 512 (100%)
        Max brightness: 512

Yet running '/etc/init.d/brightness start' blanked the display again. This
is due to:

% cat /var/lib/initscripts/brightness.intel
0

I have no idea how this value got into this file. The display was certainly
not at 0% brightness as I rebooted after the update.

Expected result:

Never ever blank the display on boot even in case
'/var/lib/initscripts/brightness.intel' contains the value zero.

Just don't.

Expected result 2:

Safe the right value to '/var/lib/initscripts/brightness.intel'. Zero is
definitly not it.

If I run:

% echo 512 > /var/lib/initscripts/brightness.intel
% /etc/init.d/brightness start

After sending this bug report I will reboot and see whether it will remember
this value. Otherwise I will 'chattr +i' this file for now.

This is on a ThinkPax X260 with Intel on board graphics from
Intel(R) Core(TM) i7-6600U CPU @ 2.60GHz CPU.

Thanks,
Martin

-- System Information:
Distributor ID:	Devuan
Description:	Devuan GNU/Linux 4 (daedalus/ceres)
Release:	5
Codename:	daedalus/ceres
Architecture: x86_64

Kernel: Linux 5.14.0-2-amd64 (SMP w/4 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: runit (via /run/runit.stopit)
LSM: AppArmor: enabled

Versions of packages initscripts depends on:
ii  lsb-base  11.1.0
ii  sysv-rc   2.96-7+devuan1

Versions of packages initscripts recommends:
ii  e2fsprogs  1.46.4-1
ii  psmisc     23.4-2

initscripts suggests no packages.

-- no debconf information

------------=_1681727047-10792-1--