[Intel-gfx] [PATCH 3/4] drm/i915: enable VT switchless resume v3

[Chris Wilson]

On Wed, Apr 03, 2013 at 11:15:40AM +0200, Daniel Vetter wrote:
> On Tue, Mar 26, 2013 at 09:25:45AM -0700, Jesse Barnes wrote:
> > With the other bits in place, we can do this safely.
> > 
> > v2: disable backlight on suspend to prevent premature enablement on resume
> > v3: disable CRTCs on suspend to allow RTD3 (Kristen)
> > 
> > Signed-off-by: Jesse Barnes <jbarnes at virtuousgeek.org>
> 
> Something seems to be race with this, occasionally when resuming my vt is
> on the X session (at least nothing happens when I try to switch to it),
> the cursor is enabled, but I see the kernel console window.
> 
> Doing a vt switch to a non-X console and back to X fixes things. I haven't
> looked exactly where we could race ...

This might be a DRM_MASTER race, if X fails to gain DRM_MASTER its
takeover is postponed indefinitely. Any clues in Xorg.0.log?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre