[Bug 70406] Can't turn on laptop screen without changing its resolution first

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70406

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

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

--- Comment #28 from Chris Wilson <chris at chris-wilson.co.uk> ---
The bug with bare X should be fixed by

commit 41b6b792d8e9c84c0a71a4bd7600e1c42e86b5bd
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Oct 15 11:23:19 2013 +0100

    sna: Preserve the user backlight value for get_property calls

    When querying the current backlight value, be sure not to overwrite the
    last user set value by the call to RRChangeOutputProperty.
    RRChangeOutputProperty calls into set_backlight_property, tricking us
    into believing that the user has set a new backlight value. The result
    is that we end up believing that the user chooses a 0 backlight if she
    should happen to query the property whilst the output is disabled.

    Reported-by: reztho at archlinux.us
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=70406
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

and it is credible that this also fixes the rogue zero backlight with desktop
environments as well.

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