[Bug 100677] New: [SNB] igt at kms_frontbuffer_tracking@fbc-suspend fails fbc_wait_for_compression() assertion

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100677

            Bug ID: 100677
           Summary: [SNB] igt at kms_frontbuffer_tracking@fbc-suspend fails
                    fbc_wait_for_compression() assertion
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: krisman at collabora.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130837
  --> https://bugs.freedesktop.org/attachment.cgi?id=130837&action=edit
test ran with IGT_LOG_LEVEL=debug

When running igt at kms_frontbuffer_tracking@fbc-suspend on a i5-2450M with
today's drm-intel-nightly kernel, it fails at the following assertion:

(kms_frontbuffer_tracking:2392) CRITICAL: Failed assertion:
fbc_wait_for_compression()
Subtest fbc-suspend: FAIL (3.775s)

It is 100% reproducible on that machine, but on another another i7-2620M it
never triggers. 

I am already running with the patch from Bug 100020 but it didn't make a
difference.

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