https://bugzilla.kernel.org/show_bug.cgi?id=60677
Bug ID: 60677
Summary: Backlight regression in ASUS Zenbok Prime UX31A
Product: ACPI
Version: 2.5
Kernel Version: 3.11-rc3
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 107075
--> https://bugzilla.kernel.org/attachment.cgi?id=107075&action=edit
acpidump
Commit efaa14c (ACPI / video: no automatic brightness changes by
win8-compatible firmware) fixed the backlight controls when in win8 OSI mode,
but introduced multiple issues.
1. The first boot afterwards happens with level 0 (the old level is not used)
2. Level 0 now turns the screen off, which didn't happen before (v3.6; the last
time the backlight driver worked correctly)
3. Each time the backlight level is changed through X, a flash happens (level
100%, level 0%, and then the desired level). It works fine through sysfs
though.
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