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_ot...@kernel-bugs.osdl.org
        ReportedBy: alex.william...@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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