Created attachment 111683 [details] kernel log uname -rm 3.17.6-1-ARCH x86_64 xf86-video-intel 2.99.917 i7-3632QM CPU - Intel® HD Graphics 4000 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA con troller]) The errors are: [ 2.888279] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A [ 2.888281] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun , and the rest of the kernel log is attached. I saw at https://01.org/linuxgraphics/documentation/how-report-bugs that I should pass the drm.debug=0x06 option to the kernel.
*** Bug 88714 has been marked as a duplicate of this bug. ***
Reported twice on HSW but I also see on BDW when alternating to fbcon and back to X. I believe there is an error in the enable/disable enable/old logic somewhere but I couldn't find. If this is the case it should affect many other platforms not just BDW and HSW. Another theory is something wrong with WM size as pointed out on dup of this.
*** This bug has been marked as a duplicate of bug 86478 ***
Closing as a duplicate for closed+fixed
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