Bug 90062

Summary: Video sync problems after quitting X on Broadwell
Product: xorg Reporter: Nick Bowler <nbowler>
Component: Driver/intelAssignee: Chris Wilson <chris>
Status: RESOLVED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
i915 platform: i915 features:
Description Flags
Xorg log
kernel log none

Description Nick Bowler 2015-04-17 03:48:35 UTC
Created attachment 115142 [details]
Xorg log

On my shiny new Thinkpad X250, when the X server is terminated on the intel
driver, the display becomes completely unstable (video just all messed up,
looks like complete loss of both horizontal and vertical sync).  Starting the
X server again does not correct the issue; the display remains messed up until
reboot.  The final line in the kernel log seems relevant:

[   90.454275] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

To reproduce, I just do startx, then press ctrl+alt+bksp.  Happens every time.

The modesetting driver does not have this problem.

Linux 4.0
X server 1.17.1
xf86-video-intel git
libdrm 2.4.60
Comment 1 Nick Bowler 2015-04-17 03:49:28 UTC
Created attachment 115143 [details]
kernel log
Comment 2 Nick Bowler 2015-04-17 03:53:36 UTC
Forgot to mention... the issue also occurs with the last release of xf86-video-intel 2.99.917
Comment 3 Chris Wilson 2015-04-17 08:06:49 UTC

*** This bug has been marked as a duplicate of bug 85583 ***

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