Created attachment 122360 [details] Intelreg dump It happens mostly while tampering with window - to reproduce I open chromium-browser with ~30 tabs, then enter/exit full screen few times on YouTube(HTML5) wideo. On drm-intel-nightly it happens even faster - often while starting the browser or opening any window. Started debugging with Ubuntu 4.2 kernel, then Ubuntu mainline 4.5 kernel, then drm-intel-nightly. Issuing: echo 1 > /sys/devices/pci0000:00/0000:00:02.0/rom cat /sys/devices/pci0000:00/0000:00:02.0/rom > vbios.dump gives input/output error at second step cat /sys/class/drm/card0/error no error state collected Intel reg dump attached. Above are relevant to drm-intel-nightly as requested , but stacktrace present in launchpadbug from ubuntu 4.2 kernel may also be relevant: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1545320
Do you need any further info or help with debuging new kernel?
Zogala - I'm really sorry about this long time until getting back to you. Do you still have this problem with the latest kernel(s), preferable generated from drm-tip? And with the new data please provide also full dmesg (add drm.debug=0x1e log_buf_len=1M to your kernel command line).
Timeout - assuming resolved+fixed. If problem still persists with the latest kernels (preferable drm-tip from git://anongit.freedesktop.org/git/drm-tip), please reopen this with the latest data as attachments (see https://01.org/linuxgraphics/documentation/how-report-bugs).
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