[Bug 91697] New: [SKL, BIOS upgrade regression] distorted display after resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91697

            Bug ID: 91697
           Summary: [SKL, BIOS upgrade regression] distorted display after
                    resume from suspend
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: tjaalton at ubuntu.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

A Skylake machine with BIOS upgraded now gets a distorted display after resume
from suspend, and the logs show:

[   52.754334] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A
[   52.754334] : 0x00000000
[   52.754343] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A
[   52.754343] : 0x00000000[drm:gen8_irq_handler [i915]] *ERROR* Fault errors
on pipe A
[   52.755689] : 0x00000000
[   52.755696] [drm:gen8_irq_handler [i915]] *ERROR* Fault errors on pipe A
[   52.755696] : 0x00000000[drm:gen8_irq_handler [i915]] *ERROR* Fault errors
on pipe A
[   52.756626] : 0x00000000

repeated ad infinitum.

happens with current drm-intel-nightly too.

Apparently the new BIOS has "Intel RC code 1.4.0", whatever that means.. Old
working one had 1.3.0.

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