https://bugzilla.kernel.org/show_bug.cgi?id=60682
Bug ID: 60682
Summary: Backlight regression since v3.7, when Windows 2012 OSI
began being reported
Product: ACPI
Version: 2.5
Kernel Version: 3.10
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 107084
--> https://bugzilla.kernel.org/attachment.cgi?id=107084&action=edit
Proposed blacklist patch
This bug is meant to track regressions since v3.7 that caused backlight to stop
working on several machines (e.g bug 52951, bug 51231). The simple solution is
to blacklist these machines until a proper solution is working correctly, which
as of v3.11-rc3, that's not the case.
If your machine works correctly with acpi_osi="!Windows 2012", and doesn't
otherwise, comment with the name of the laptop, plus the output of this
command:
% dmesg | grep DMI
---
Since v3.7 the acpi backlight driver doesn't work correctly in several
machines because ACPI code has different code for Windows 8, and the
rest.
The commit ea45ea7 (in v3.11-rc2) tried to fix this problem by using the
intel backlight driver, however it introduced several other issues in
different machines.
This patch fixes both regressions by blacklisting the win8 OSI, so we
are back to v3.6 behavior, and it should remain that way until the intel
backlight driver is fixed.
Since v3.7, users have been forced to fix the initial regression by
modifying the boot arguments (acpi_osi="!Windows 2012").
https://wiki.archlinux.org/index.php/ASUS_Zenbook_Prime_UX31A
https://bugzilla.kernel.org/show_bug.cgi?id=52951
https://bugzilla.kernel.org/show_bug.cgi?id=51231
TODO:
* Toshiba Portege R930
* Lenovo G560a
* Asus UX21A
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