[Bug 81548] New: [HSW] suspend/resume sometimes leaves DRI crippled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81548

          Priority: medium
            Bug ID: 81548
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW] suspend/resume sometimes leaves DRI crippled
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: liquid.acid at gmx.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Hello,

got a new laptop system, which is still dealing with some "teething problems".
After some suspend/resume cycles the DRI support gets crippled, in the
following sense:
E.g. glxgears just displays are black screen and doesn't provide any status
output. So it's not like it is rendering something which is not shown on the
screen then. Something is blocking here. Investigating dmesg and the Xorg log
didn't provide anything useful. No GPU hang detected or anything out of the
ordinary. I'm going to check again though when it happens again.

I should be using DRI3 here. Also using PRIME (a dedicated Radeon R9 M265X)
shows the same results, no rendering.

Software stack:
xorg-server-1.16.0
mesa git tip
libdrm git tip
vanilla 3.15.6

CPU is a i7-4700HQ, which should make the GPU a hsw/gen7.5 (?)

Uploading dmesg and Xorg log later.

Any ideas how to debug this, should it happen again? I thought about just
attaching gdb to glxgears and checking where it's looping for starters.


With best wishes,
Tobias

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