[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 #11 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 115338
  --> https://bugs.freedesktop.org/attachment.cgi?id=115338&action=edit
Disable CRTC if DPMS fails

Ok, that looks consistent with the kernel failing to disable the output (and
not the following SaveScreen(unblank)).

Can you please test the following patch? Having a debug log (like the last with
just X + xterm) in any case would be very useful, thanks.

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