https://bugzilla.kernel.org/show_bug.cgi?id=101851
Bug ID: 101851
Summary: Thinkpad X240 brightness keys broken
Product: ACPI
Version: 2.5
Kernel Version: 4.2.0-rc3
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: acpi_power-vi...@kernel-bugs.osdl.org
Reporter: m.othac...@gmail.com
Regression: No
Created attachment 183321
--> https://bugzilla.kernel.org/attachment.cgi?id=183321&action=edit
dmesg output
Hi !
I found myself in case described by bug
https://bugzilla.kernel.org/show_bug.cgi?id=81691 but with a different laptop.
My Thinkpad X240 has a working acpi_video backlight control, but due to bios
claiming win8 support, the native backlight interface (i915) is loaded.
The native interface works as intended, brightness events are sent to userspace
but I have nothing set up to handle them (kde, gnome or acpid ...).
Forcing acpi_video to load and handle backlight control, using the quirk
described in bug 81691 solves my problem (see patch attached).
Thanks,
Mathieu
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