[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

--- Comment #30 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit ad5b6a303b44ba0ae9f8df075a7efec92a2e41ff
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Oct 15 12:48:27 2013 +0100

    Revert "sna: Preserve the user backlight value for get_property calls"

    This reverts commit 41b6b792d8e9c84c0a71a4bd7600e1c42e86b5bd in favour
    of the better fix to not ask RRChangeOutputProperty to reset the known
    hardware values.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

commit e76b08cad2770015346fd4cd757de3bb3b6ff37c
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Oct 15 12:46:09 2013 +0100

    sna: Disable updating properties upon reading their values

    When we assign the hardware values to the output properties, we do not
    need to process the set_property callback to write those values back to
    hardware. This callback is triggered by the pending update flag passed
    to RRChangeOutputProperty.

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

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