https://bugzilla.kernel.org/show_bug.cgi?id=70631
Bug ID: 70631
Summary: Thinkpad x240s: Brightness hotkeys not working
Product: ACPI
Version: 2.5
Kernel Version: 3.13.3
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: Yes
Created attachment 126231
--> https://bugzilla.kernel.org/attachment.cgi?id=126231&action=edit
acpi acpidump.txt dmidecode.log fwts lslabacklight results.log version
The brightness hotkeys used to work fine with kernel 12.x after adding
acpi_backlight=vendor to the kernel parameters.
I upgraded to 13.3 today and the hotkeys stopped working.
I can still control the brightness using:
echo 700 > /sys/class/backlight/intel_backlight/brightness
Combinations of Kernel parameters I have tried:
- No parameters at all
- Only acpi_backlight=vendor
- Only video.use_native_backlight=1 (using this now)
- acpi_backlight=vendor video.use_native_backlight=1
thinkpad-acpi.brightness_enable=1
The hotkeys show up fine in xev.
I've attached some logs, if you need more information, I'll be happy to provide
it.
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