Created attachment 91419 [details]
- Chipset: HM65
- System architecture: x86-64
- xf86-video-intel version: 2.21.15
- xserver version: 1.14.5
- mesa version: 9.2.2
- libdrm version: 2.4.50
- kernel version: 3.11-2-amd64
- linux distribution: Debian (testing)
- machine: HP Folio 13 - 2000
- display connector: HDMI
Most of the time (~70%) I get rendering issues in gnome-shell immediately after logging in (see attached video). It makes no difference if I have my external display connected or not. Normally logging out and back in (one or two times) solves the problem.
After logging in I change into gnome-shell activities view. If I see rendering issues I log out and in again until I get a normal view – then the problem is solved for the whole session (the problem won't occur after some time).
Created attachment 91420 [details]
dmesg output with boot option "drm.debug=0x06"
Created attachment 91421 [details]
video showing rendering issues
Sorry, I forgot to mention that this is a regression, I didn't have this problem in Debian stable. I'm not sure but as far as I remember I first encountered these rendering issues right after gnome 3.8 arrived in Debian testing.
The described visual artifacts seem to be caused by a bug in gnome-shell, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=743810
Since this bug was confirmed on many different systems it seems proven to me that this is no hardware specific bug but a gnome-shell bug. So I'm closing this bug.