Devuan bug report logs - #617
initscripts: brightness init script sets brightness to zero, thus blanking laptop display

Package: initscripts; Reported by: Martin Steigerwald <martin@lichtvoll.de>; dated Mon, 11 Oct 2021 16:22:02 UTC; Maintainer for initscripts is Devuan Developers <devuan-dev@lists.dyne.org>.

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To: Martin Steigerwald <martin@lichtvoll.de>
Cc: 617@bugs.devuan.org, Jacob Lundberg <jacob@gnifty.net>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to
 zero, thus blanking laptop display
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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

Acknowledgement sent to Mark Hindley <mark@hindley.org.uk>:
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bug#617; Package initscripts. Full text available.

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From: Martin Steigerwald <martin@lichtvoll.de>
To: Mark Hindley <mark@hindley.org.uk>
Cc: 617@bugs.devuan.org, Jacob Lundberg <jacob@gnifty.net>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

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From: Martin Steigerwald <martin@lichtvoll.de>
To: Mark Hindley <mark@hindley.org.uk>
Cc: 617@bugs.devuan.org, Jacob Lundberg <jacob@gnifty.net>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Date: Wed, 22 Dec 2021 16:42:54 +0100
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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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

Message received at 617@bugs.devuan.org:


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Subject: Re: bug#617: 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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From 0bbb9d27a673826a2fa2611c62913107a7809f88 Mon Sep 17 00:00:00 2001
From: Mark Hindley <mark@hindley.org.uk>
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


--meERfjFuLIGHDu0h--

Acknowledgement sent to Mark Hindley <mark@hindley.org.uk>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

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From: Martin Steigerwald <martin@lichtvoll.de>
To: Mark Hindley <mark@hindley.org.uk>, 617@bugs.devuan.org, devuan developers internal list <devuan-dev@lists.dyne.org>
Cc: Jacob Lundberg <jacob@gnifty.net>
Subject: Re: [devuan-dev] bug#617: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
Date: Wed, 22 Dec 2021 11:19:17 +0100
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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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

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Subject: Re: [devuan-dev] bug#617: initscripts: brightness init script sets
 brightness to zero, thus blanking laptop display
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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

Acknowledgement sent to Jacob Lundberg <jacob@gnifty.net>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

Message received at 617@bugs.devuan.org:


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From: Martin Steigerwald <martin@lichtvoll.de>
To: 617@bugs.devuan.org, devuan developers internal list <devuan-dev@lists.dyne.org>, Olaf Meeuwissen <paddy-hack@member.fsf.org>
Cc: Mark Hindley <mark@hindley.org.uk>
Subject: Re: [devuan-dev] bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
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Subject: Re: [devuan-dev] 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… 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
 Support Free Software                        https://my.fsf.org/donate
 Join the Free Software Foundation              https://my.fsf.org/join

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From: Mark Hindley <mark@hindley.org.uk>
To: Martin Steigerwald <martin@lichtvoll.de>
Cc: 617@bugs.devuan.org
Subject: Re: bug#617: initscripts: brightness init script sets brightness to
 zero, thus blanking laptop display
Message-ID: <YWVeefuljC4B7F0C@hindley.org.uk>
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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

Acknowledgement sent to Mark Hindley <mark@hindley.org.uk>:
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From: Martin Steigerwald <martin@lichtvoll.de>
To: 617@bugs.devuan.org, Mark Hindley <mark@hindley.org.uk>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
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bug#617; Package initscripts. Full text available.

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From: Martin Steigerwald <martin@lichtvoll.de>
To: 617@bugs.devuan.org, Mark Hindley <mark@hindley.org.uk>
Subject: Re: bug#617: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
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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



Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
Extra info received and forwarded to list. Copy sent to Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

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From: Mark Hindley <mark@hindley.org.uk>
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Subject: Re: bug#617: initscripts: brightness init script sets brightness to
 zero, thus blanking laptop display
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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

Information forwarded to devuan-bugs@lists.dyne.org, Devuan Developers <devuan-dev@lists.dyne.org>:
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Subject: initscripts: brightness init script sets brightness to zero, thus blanking laptop display
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Package: initscripts
Version: 2.96-7+devuan1
Severity: normal
X-Debbugs-Cc: martin@lichtvoll.de

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

Acknowledgement sent to Martin Steigerwald <martin@lichtvoll.de>:
New bug report received and forwarded. Copy sent to martin@lichtvoll.de, Devuan Developers <devuan-dev@lists.dyne.org>. Full text available.
Report forwarded to devuan-bugs@lists.dyne.org, martin@lichtvoll.de, Devuan Developers <devuan-dev@lists.dyne.org>:
bug#617; Package initscripts. Full text available.

Devuan BTS -- Powered by Debian bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.

Devuan Bugs Owner <owner@bugs.devuan.org>.
Last modified: Sun, 16 Jan 2022 18:39:01 UTC