https://bugzilla.kernel.org/show_bug.cgi?id=70241
Bug ID: 70241
Summary: Asus UX302LA: Backlight hotkays need acpi_osi=NULL
workaround
Product: ACPI
Version: 2.5
Kernel Version: 3.14
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 125091
--> https://bugzilla.kernel.org/attachment.cgi?id=125091&action=edit
acpidump
Backlit hotkays do not work on Asus UX302LA until "acpi_osi=" (acpi_osi without
arguments). Probably it affects more then just backlight, for example blank
screen issue.
according to this part:
Method (_INI, 0, NotSerialized) // _INI: Initialize
{
Store (0x07DC, OSYS)
If (CondRefOf (\_OSI, Local0))
{
If (_OSI ("Linux"))
...
If (_OSI ("Windows 2012"))
{
Store (0x07DC, OSYS)
}
If (_OSI ("Windows 2013"))
{
Store (0x07DD, OSYS)
}
... setting osi to NULL should be same as setting it to "Windows 2012", but for
some reasons acpi_osi="Windows 2012" didn't worked for me.
In both cases ACPI video driver doing the job, so i assume. this driver has
some windows_8 check which is not triggered by osi=NULL.
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