[Bug 58181] New: Maximum sscreen brightness capped at 80 under gma500

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=58181

           Summary: Maximum sscreen brightness capped at 80 under gma500
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.9.2
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: intel-gfx-bugs at lists.freedesktop.org
        ReportedBy: bruno.r.dias at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No


As of the 3.9 kernel, the gma500 driver now properly supports setting the
screen brightness, and the brightness keys work as intended, with one
exception: The brightness is maxed out at 80.

I can set the brightness to 100 (The actual maximum) by writing to
sys/class/backlight/psb-bl/brightness, as normal, but the actual brightness+
key won't raise it over 80. In a possibly unrelated issue, disconnecting or
connecting the AC adapter causes the brightness level to reset to 80, if it is
higher than 80.

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