[Bug 78200] [regression] Backlight too dim to use from kernel 3.14 and systemd error

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed May 7 09:54:08 PDT 2014


https://bugs.freedesktop.org/show_bug.cgi?id=78200

Mike C <mike.cloaked at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #18 from Mike C <mike.cloaked at gmail.com> ---
This bug is resolved and was indeed due to the script that I had executing
during KDE login that set the screen brightness. After changing my kde script
and rebooting an appropriate brightness value was stored, and then used at next
login.

After making the change to my script and rebooting the brightness no longer
exhibited a problem.

Therefore there is no kernel or systemd bug, and I will close this report as
resolved.

The problem that led to my confusion was that at some point a kernel update
changed the max_brightness value from the driver for my system, but my original
script set the brightness at login numerically and this value became
inappropriate after the kernel change.  However using the Fn + Up Arrow keys
did not reset the value in /sys/class/backlight/intel_backlight/brightness
despite the screen becoming normal brightness, and so this low value persisted
when systemd saved the current value and restored it at next boot.

Sorry it took me so long to recognise that it was my kde script that was
causing the symptoms.

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