Bug 89848

Summary: i915: framebuffer corruption when switching tty or quitting x-server with kernel >=4.0
Product: DRI Reporter: Dominic Lindsay <dcrl94>
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: normal    
Priority: medium CC: intel-gfx-bugs
Version: XOrg git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg output after framebuffer corruption occurs. none

Description Dominic Lindsay 2015-03-31 17:36:44 UTC 
Using any of the 4.0 kernels I get framebuffer corruption when switching tty or quitting X.
my dmesg output gives:

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Some people running 3.19 are getting corruption when running multiple displays, with 'pipe B FIFO underrun'.
Comment 1 Jesse Barnes 2015-03-31 18:13:57 UTC 
What does the corruption look like?  Can you attach a picture?  Also, I assume you didn't get this corruption on the last kernel, would it be possible to bisect to the failing commit?
Comment 2 Chris Wilson 2015-03-31 20:07:29 UTC 
Please attach your dmesg so we know what hardware you have? Preferably with drm.debug=0x6 set on the kernel command line.
Comment 3 Dominic Lindsay 2015-04-01 12:11:59 UTC 
Created attachment 114808 [details]
dmesg output after framebuffer corruption occurs.
Comment 4 Dominic Lindsay 2015-04-01 12:12:37 UTC 
The corruption makes the writing 'spin' across the screen, from left to right. 
Sometimes I dont seem to be able to switch tty.

Its hard to get a pic since I cant screen cap. 

If you guys dont mind a phone picture I can upload that. I have attacked a .txt with my dmesg output plus the kernel params set.

I cant do a bisect today, as I would have to learn to do it, I simply don't have time to do it today.

When speaking to some people in IRC they say they get some corruption on their second display on kernel 3.19.
Comment 5 Chris Wilson 2015-04-01 12:15:36 UTC 

*** This bug has been marked as a duplicate of bug 85583 ***
Comment 6 Jari Tahvanainen 2016-10-10 11:39:14 UTC 
Closing as duplicate of closed+fixed.

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