[Intel-gfx] [PATCH 2/2] drm/i915: Don't reprobe on resume

[Daniel Vetter]

On Thu, Jul 16, 2015 at 04:32:44PM +0100, Chris Wilson wrote:
> On Thu, Jul 16, 2015 at 04:47:51PM +0200, Daniel Vetter wrote:
> > If we don't force the connector state to unknown there's no reason any
> > more to force a reprobe. Also no other driver bothers with this, so
> > probably it's not required - userspace handles lid/resume events
> > through other channels already.
> 
> No, we don't. We don't synthesize any events at all for changing
> connectors whilst suspended and userspace doesn't know about being
> suspended.

The problem is that since 

commit 816da85a0990c2b52cfffa77637d1c770d6790e9
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Oct 23 18:23:33 2012 +0000

    drm: handle HPD and polled connectors separately

this has partially been broken (we only checked hpd connectors and not all
of them), and apparently no one noticed or complained. Also none of the
other drivers check this either. If we really need this then we need to
fix it correctly, but right now I don't see much evidence for this really.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch