[Intel-gfx] [Intel HD 4400] strongly irritating artefacts on 2560x1440 laptop display

[Martin Wilck]

On 01/28/2015 10:45 AM, Chris Wilson wrote:

> From watching the video, and your comments here, it is clear this is not
> a driver bug (neither in the ddx nor opengl compositor). That leaves us
> with hardware misconfiguration, aka kernel bug. Some of the artefacts
> could be a display underrun. It would be good to check a drm.debug=0xe
> dmesg for any warnings (and the info itself will be useful). Another
> thing worth playing with is i915.enable_fbc=1 (though that is really
> just swapping one problem with another).

i915.enable_fbc=1 had no effect.

I agree with you that this is probably a low-level problem, although the
fact that the artefacts strongly depend on Window content doesn't fit
that theory.

Martin

PS: I have just done a thing I thought I'd never do - I am downloading
an evaluation copy of Windows in order to check whether my HW is faulty.