[Intel-gfx] Issues with Atomic Modesetting on Sandybridge

[Daniel Vetter]

On Tue, Mar 24, 2015 at 06:39:03PM +0000, Mike Lothian wrote:
> Hi
> 
> Since [31c946e85ce6b48ce0f25e3cdca8362e4fe8b300] drm: If available use
> atomic state in getcrtc ioctl, X doesn't start correctly on my
> Sandybridge machine
> 
> I've tried reverting this commit and my X session still starts up blank
> 
> It only works again when I pass i915.nuclear_pageflip=0 - I realise
> this is pretty new stuff but I thought I'd let you know I've been
> testing it and it's stopped working on Sandybridge

nuclear_pageflip=0 is the default. If you use this then you get to keep
all the pieces since we atm now that it doesn't fully work.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch