On Tue, Jan 27, 2015 at 10:49:43PM +0100, Martin Wilck wrote: > Dear list members, > > I suffer from highly disturbing artefacts with the Intel HD 4400 chip > set on thw 2560x1440 display (Sharp LQ133T1JW19) of my Fujitsu Lifebook > S904. The effects are hard to describe, therefore I have uploaded a > video to > https://www.dropbox.com/sh/9wh0nzvp0w1phxz/AAAsvAqHN8ApXzor58FmGbwLa?dl=0. > I can distinguish 2 effects that are possibly related to each other: [snip] > 1.) is observed only under GNOME, but I see 2.) on KDE and LXDE, too. I > also tried various distributions. Most of my experiments have been done > on OpenSUSE 13.2, kernel-vanilla-3.19.rc5, xorg 7.6_1.16.1-5.1, intel > 2.99.916, libdrm_intel1-2.4.58-1.1, Mesa 10.3.0-91.3.2. But I see the > artefacts also on Fedora 21 and Ubuntu 14.04. > > As a matter of fact, I tried the modesetting driver and even fbdev and > observed similar effects, too. Thus i915 may actually not be the culprit > here, but could I figure no other place to ask for help than this > mailing list. >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). -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
