[Bug 79699] XRandr backlight notifications are lost

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79699

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit c6cd10f536e099277cdc46643725a5a50ea8b525
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Jun 5 22:43:37 2014 +0100

    sna: Hook up a backlight udev monitor for external changes

    Changes to the backlights are notified through uevents. Hooking up a
    udev monitor to listen out for external changes to the backlight (e.g.
    through ACPI function keys, or by the user writing to
    /sys/class/backlight directly) is easier than enabling polling on the
    backlight sysfs file using X's select() mechanism.

    Since we listen to backlight changes, we have to be careful not to
    confuse the side-effects of disabling connectors (which may cause either
    ourselves or the kernel to turn off the backlight) with the user value.

    Many thanks to Alexander Mezin for the suggestion to use udev for
    tracking the notifications for external changes to the backlight.

    Reported-by: Alexander Mezin <mezin.alexander at gmail.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=79699
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

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