Created attachment 134384 [details] syslog from recorded session I am experiencing some violent graphical glitches in situations when the screen is turned back on after it went to sleep or after it was turned off with "xset dpms force off". The glitches continue even after exiting the X into the console. hardware: Lenovo ThinkPad X250 cpu: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz kernel: 4.13.3 vanilla xorg-server: 1.19.3 Video of the glitches: https://www.youtube.com/watch?v=yvv0cHL4UyM On the video glitches start only after sixth attempt to do "xset dpms force off" while the debugging options "drm.debug=0xe log_bug_len=2M" are on. Without these options glitches appear much more frequently (nearly every time). At the end of the video I do exit the X server to reboot the system from console and the glitches still continue in the console. System log from the session on the video with "drm.debug=0xe log_bug_len=2M" attached. During the activation of the glitches the error line "[drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun" does appear. As far as I remember this regression was introduced in kernel 4.12 (4.11 was fine). I can test both, if needed. Also, is this the right place for this bug report or should I create one on kernel bugzilla? Also might be related to https://bugs.freedesktop.org/show_bug.cgi?id=102587
Created attachment 134385 [details] kernel config
Also with i915.enable_rc6=0 the problem seems to be gone. But not with i915.enable_rc6=1 or a default value.
(In reply to Aleksey Rybalkin from comment #0) > Video of the glitches: https://www.youtube.com/watch?v=yvv0cHL4UyM Cutting to the chase https://youtu.be/yvv0cHL4UyM?t=1m9s > Also, is this the right place for this bug report or should I create one on > kernel bugzilla? This is the place. All drm/i915 bugs at kernel bugzilla will be resolved invalid and reporters redirected here.
I have the same exact hardware. It also happens to me. Possible duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=102587 4.12 kernel messed up a whole bunch of things for my thinkpad x250.
*** This bug has been marked as a duplicate of bug 102587 ***
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