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Bug#868884: linux-source: Kernels 4.x no boot on Dells with no Kbd Backlight

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  Bug#868884: linux-source: Kernels 4.x no boot on Dells with no Kbd Backlight b17 <bwtnguy@yahoo.com> - 2017-07-19 15:30 +0200
    Bug#868884: src:linux: dell::kbd_backlight Causes Powerdevil Lockup on Resume bw <bwtnguy@yahoo.com> - 2017-11-15 19:20 +0100

#58457 — Bug#868884: linux-source: Kernels 4.x no boot on Dells with no Kbd Backlight

Package: linux-source
Version: 4.1 and up
Severity: normal

Dear Maintainer,

Kernels 4.x backports on jessie, and current 4.9 in stretch won't boot 
on this machine without a tweak.  Hard lockup shortly after boot when
systemd tries to restore a kbd backlight that doesn't exist.

Affects at least two other dell laptop models around 8-10 years old.

The workaround is:
# systemctl mask systemd-backlight@leds\:dell\:\:kbd_backlight.service
 -or- 
kernel parameter 
systemd.restore_state=0

references:
https://github.com/systemd/systemd/issues/1792
https://bugzilla.kernel.org/show_bug.cgi?id=107651

Earlier reports here, I have not seen a similar debian bug reported.
https://bugzilla.redhat.com/show_bug.cgi?id=1253523
https://bugs.archlinux.org/task/47509
https://bbs.archlinux.org/viewtopic.php?id=201523&p=2

Thanks for all the hard work on stretch, it's pretty far out man.

L8r,
bw

-- System Information:
Debian Release: 9.0
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-source depends on:
pn  linux-source-4.9  <none>

linux-source recommends no packages.

linux-source suggests no packages.

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#59406 — Bug#868884: src:linux: dell::kbd_backlight Causes Powerdevil Lockup on Resume

Package: src:linux
Followup-For: Bug #868884

This file shouldn't exist, as the machine has no kbd backlight:

/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight

Kde power management thinks it needs to restore it on resume.  The
only workaround I could find is remove powerdevil packages.

Nothing can be removed, added or edited.  I read a little about sysfs,
but I think I'll leave it alone.  I thought maybe it could be a bad BIOS,
maybe an ACPI issue, not really sure how it can get solved.

/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight# ls -l
total 0
-rw-r--r-- 1 root root 4096 Nov 14 18:26 brightness
lrwxrwxrwx 1 root root    0 Nov 15 13:02 device -> ../../../dell-laptop
-r--r--r-- 1 root root 4096 Nov 14 18:26 max_brightness
drwxr-xr-x 2 root root    0 Nov 15 13:02 power
-rw-r--r-- 1 root root 4096 Nov 15 13:02 start_triggers
-rw-r--r-- 1 root root 4096 Nov 15 13:02 stop_timeout
lrwxrwxrwx 1 root root    0 Nov 14 18:26 subsystem -> ../../../../../class/leds
-rw-r--r-- 1 root root 4096 Nov 15 13:02 trigger
-rw-r--r-- 1 root root 4096 Nov 14 18:26 uevent

-- System Information:
Debian Release: 9.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE= (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

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