[Bugme-new] [Bug 40862] New: Cannot change brightness on laptop with ATI Radeon 6470M

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=40862

           Summary: Cannot change brightness on laptop with ATI Radeon
                    6470M
           Product: ACPI
           Version: 2.5
    Kernel Version: 3.0.0, 3.0.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Video
        AssignedTo: acpi_power-video at kernel-bugs.osdl.org
        ReportedBy: bugzilla at lourdas.name
        Regression: No


When I press Fn+F9 or F10 which are the keyboard buttons to decrease/increase
the screen brightness of my HP Probook 6560b laptop, nothing happens.

acpi_listen reports:

video/brightnessdown BRTDN 00000087 00000000
video/brightnessdown BRTDN 00000087 00000000
video/brightnessup BRTUP 00000086 00000000
video/brightnessup BRTUP 00000086 00000000

/var/log/messages shows:

Aug 10 16:41:04 localhost dbus[2038]: [system] Successfully activated service
'org.kde.powerdevil.backlighthelper'
Aug 10 16:41:06 localhost logger: ACPI event unhandled: video/brightnessdown
BRTDN 00000087 00000000
Aug 10 16:41:09 localhost logger: ACPI event unhandled: video/brightnessup
BRTUP 00000086 00000000
Aug 10 16:41:10 localhost logger: ACPI event unhandled: video/brightnessup
BRTUP 00000086 00000000
Aug 10 16:41:18 localhost logger: ACPI event unhandled: battery PNP0C0A:00
00000080 00000001
Aug 10 16:42:23 localhost logger: ACPI event unhandled: battery PNP0C0A:00
00000080 00000001

I'm using x86_64 kernel from Gentoo packages (gentoo-sources). The issue
persists both in kernels 3.0.0 and 3.0.1.

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