Discussion:
[Powerdevil] [Bug 391811] New: Keyboard backlight is always off when laptop is resumed
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Petr Nehez
2018-03-13 14:03:38 UTC
Permalink
https://bugs.kde.org/show_bug.cgi?id=391811

Bug ID: 391811
Summary: Keyboard backlight is always off when laptop is
resumed
Product: Powerdevil
Version: 5.12.2
Platform: Manjaro
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-***@kde.org
Reporter: ***@gmail.com
Target Milestone: ---

It seems that power management is broken.
Whenever I resume my laptop keyboard backlight is off eventhough it was ON
before.

All 3 modes (AC/bat/lowbat) has not been changed for at least a month and it
has no value set in all 3 modes for keyboard backlight.

I am having other issue with recent Plasma -
https://bugs.kde.org/show_bug.cgi?id=391558, probably related?

----------------------------

This is part of journal after resuming:

bře 13 14:50:17 NEHEZ-DELL org_kde_powerdevil[1067]: [14::50:17.102] unknown:
Kbd backlight brightness value: 0
bře 13 14:50:17 NEHEZ-DELL org_kde_powerdevil[1067]: [14::50:17.102] unknown:
set kbd backlight value: 0
bře 13 14:50:17 NEHEZ-DELL org_kde_powerdevil[1067]: [14::50:17.114] unknown:
Keyboard brightness changed!!
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Petr Nehez
2018-03-13 14:06:57 UTC
Permalink
https://bugs.kde.org/show_bug.cgi?id=391811

--- Comment #1 from Petr Nehez <***@gmail.com> ---
Kernel: 4.15.7-1-MANJARO x86_64
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Nate Graham
2018-03-13 16:28:26 UTC
Permalink
https://bugs.kde.org/show_bug.cgi?id=391811

Nate Graham <***@kde.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEEDSINFO
CC| |***@kde.org
Resolution|--- |WAITINGFORINFO

--- Comment #2 from Nate Graham <***@kde.org> ---
Does rolling back to an earlier kernel help?
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Nate Graham
2018-03-13 16:34:18 UTC
Permalink
https://bugs.kde.org/show_bug.cgi?id=391811

Nate Graham <***@kde.org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Resolution|WAITINGFORINFO |DOWNSTREAM
Status|NEEDSINFO |RESOLVED

--- Comment #3 from Nate Graham <***@kde.org> ---
I ask because Manjaro is a rolling distro that gets kernel updates pretty
frequently, and you indicated that yo didn't change any powerdevil settings. In
the discussion linked to from Bug 391558, you also indicated that there were no
updates to powerdevil, but there was a kernel update. Therefore, it seems very
likely that this was caused by a kernel regression. If indeed it's a kernel
regression, the issue should be reported on https://bugzilla.kernel.org/.

If the problem persists after you roll back the kernel to an earlier version,
then please re-open the bug.
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Petr Nehez
2018-03-14 18:15:20 UTC
Permalink
https://bugs.kde.org/show_bug.cgi?id=391811

Petr Nehez <***@gmail.com> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |CLOSED

--- Comment #4 from Petr Nehez <***@gmail.com> ---
I went back to kernel 4.14, even 6 steps back, nothing has changed.
Then I upgraded to the latest 4.14 again and voila - backlight works as
expected.

That's a magic - I don't like these bugs ;)
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