[Bug 90179] dpms/blanking does not work with current git on HD 5500

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90179

--- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
Sorry for the delay, I tweaked the initial patch until I was able to start up
and blank/restore the outputs with DPMS on/off. That patch is

commit 7d9a74622e5a936e4860fcef8358619bf59adae8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jun 15 14:16:34 2015 +0100

    sna: Be robust in handling DPMS failures

    If we fail to turn off an output via DPMS, disable the entire CRTC in
    order to blank the output and save the screeen/power.

    Reported-by: Lukas Hejtmanek  <xhejtman at fi.muni.cz>
    References: https://bugs.freedesktop.org/show_bug.cgi?id=90179
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

I still haven't worked out where the EINVAL is coming from that's triggering
the failure in the first place, but now it should be behaving itself even if we
cannot set the DPMS mode on individual outputs.

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