Bug 87990

Summary: [HSW/BDW] *ERROR* CPU pipe A FIFO underrun
Product: DRI Reporter: Neven Sajko <nsajko>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: minor    
Priority: medium CC: intel-gfx-bugs, myfoolishgames, nsajko
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
kernel log none

Description Neven Sajko 2015-01-03 10:17:21 UTC 
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.
Comment 1 Rodrigo Vivi 2015-01-22 21:56:57 UTC 
*** Bug 88714 has been marked as a duplicate of this bug. ***
Comment 2 Rodrigo Vivi 2015-01-22 22:00:14 UTC 
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.
Comment 3 Rodrigo Vivi 2015-01-22 22:20:19 UTC 

*** This bug has been marked as a duplicate of bug 86478 ***
Comment 4 Jari Tahvanainen 2016-10-06 07:41:49 UTC 
Closing as a duplicate for closed+fixed

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.