Bug 96899

Summary: gen7 regression [bisected]: GPU hangs when attempting to bring up gdm login screen
Product: Mesa Reporter: Aaron Watry <awatry>
Component: Drivers/DRI/i965Assignee: Ian Romanick <idr>
Status: RESOLVED DUPLICATE QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: major    
Priority: medium    
Version: git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: dmesg output with hangs
DRM errors from GDM-induced gpu hang

Description Aaron Watry 2016-07-12 14:13:15 UTC 
Created attachment 125028 [details]
dmesg output with hangs

A week or so ago I had to reboot my laptop at work, and when it came back up, all I saw was a cursor on a black screen, instead of my login prompt.

Hardware: Haswell i7 mobile (Core i7-4810MQ), 16GB RAM
OS: Ubuntu 16.04, x86-64, mesa/libdrm from git, kernel 4.6.3 from mainline kernel ppa

I knew that this had been working as of my last reboot, and also with 11.2 installed, so I spent a bit of time last night bisecting down to:

39fdee6b2df3cb297c0d2aba285f6991824867b9 is the first bad commit
commit 39fdee6b2df3cb297c0d2aba285f6991824867b9
Author: Topi Pohjolainen <topi.pohjolainen@intel.com>
Date:   Wed May 18 22:07:05 2016 +0300

    i965/blorp/gen7+: Do not trigger push constant space reconfig

    Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
    Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>


During bisecting steps, I did a full power-cycle and cold boot, as warm reboots did NOT necessarily reproduce the issue reliably. This is still an issue in mesa git as of July 11.

dmesg is attached
Comment 1 Aaron Watry 2016-07-12 14:55:29 UTC 
Created attachment 125029 [details]
DRM errors from GDM-induced gpu hang
Comment 2 Aaron Watry 2016-07-12 15:13:36 UTC 

*** This bug has been marked as a duplicate of bug 96878 ***

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