[Bugme-new] [Bug 32592] New: Asus UL30VT backlight control only works with acpi_osi="Linux" acpi_osi="!Windows 2009"
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Sun Apr 3 20:16:53 PDT 2011
https://bugzilla.kernel.org/show_bug.cgi?id=32592
Summary: Asus UL30VT backlight control only works with
acpi_osi="Linux" acpi_osi="!Windows 2009"
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: acpi_other at kernel-bugs.osdl.org
ReportedBy: alex.williamson at redhat.com
Regression: No
Created an attachment (id=53362)
--> (https://bugzilla.kernel.org/attachment.cgi?id=53362)
Asus UL30VT Bios 211 DSDT
Asus UL30VT backlight control only works with acpi_osi="Linux"
acpi_osi="!Windows 2009". Without these options, I get a desktop notification
for the brightness when using the Fn brightness up/down keys, but no change in
display brightness. Likewise the sysfs brightness control thinks it's doing
it's job when I read and write the file, but there's no change in the display
state. Either method causes the display brightness to change when the system
is rebooted, as if Linux setup the change, but didn't actually flush it out to
hardware.
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