https://bugzilla.kernel.org/show_bug.cgi?id=52951
Summary: ASUS N56VZ screen brightness keys not working
Product: ACPI
Version: 2.5
Kernel Version: 3.8 git
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: BIOS
AssignedTo: acpi_b...@kernel-bugs.osdl.org
ReportedBy: kam1k...@gmail.com
Regression: No
Screen brightness keys don't do anything on my Asus N56VZ notebook.
I tried the various "acpi_osi" and "acpi_backlight" options and the only thing
that kind of works is passing "acpi_osi=" (empty) as a kernel option, but all
this does is letting the BIOS handle the brightness itself. Therefore I don't
get the "pretty" notifications of screen brightness changes.
The key command never seems to reach linux. I have tried "xev", cat
/dev/input/eventX and even modifying the asus-wmi module to print messages of
the commands it receives, and it doesn't receive the screen brightness key
commands. It does receive all others though.
I have yet to notice any weird behaviour resulting from "acpi_osi=" argument,
but it could be a problem later.
I have tried to use a modified DSDT table to remove OS checks on the screen
brightness key methods and try several tricks like emitting a specific
brightness code (just like the other simpler Fn keys do) to no avail. To make
sure the methods are being called I tried to make the brightness keys change
the volume instead, and it works.
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