https://bugzilla.kernel.org/show_bug.cgi?id=85051
Bug ID: 85051
Summary: Asus X53SM: Brightness control does not work anymore
[regression]
Product: ACPI
Version: 2.5
Kernel Version: 3.16.3
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
With Linux 3.16.3, controlling the brightness of my laptop screen does not work
anymore. It's working fine with the 3.15.10 kernel (both vanilla).
Previous behavior (3.15):
* When I drag the brightness slider in KDE, the OSD appears and the
brightness changes.
* After some minutes of inactivity with no AC (as configured in the
KDE power-saving options), the screen is dimmed.
* When I press the brightness keys on the keyboard, the brightness
changes *but* KDE does not notice, no OSD appears, and the brightness
slider in the battery applet does not move.
Current behavior (3.16):
* Dragging the brightness slider does nothing except for showing the OSD.
* No dimming on inactivity happens.
* Pressing the brightness ekys on the keyboard results in the KDE brightness
OSD appearing, without the brightness changing.
So the power system (KDE, presumably through upower?) now notices that
I press the power keys. However, the keys don't work anymore. Overall, this
is clearly a regression as I can now no longer control the brightness.
I bootet the current system with the old kernel to verify that the kernel
is the only part that changed.
I can do a bisect, but I'd appreciate a pointer which directory to restrict the
bisect to.
I reported this bug against Debian as well at
<https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=762285>. That report
contains a whole lot of information about by hardware. Please let me know if
you need further information.
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