[Bug 59750] New: [GM45 regression] system hang while booting up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59750

          Priority: medium
            Bug ID: 59750
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [GM45 regression] system hang while booting up
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: All
          Reporter: cancan.feng at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

branch name: drm-kms-locking


Description:
----------------------------------------
We tested nightly, found machine hang while booting after grub.Then the screen
turned into black. I can't login by ssh. We found this issue caused by "branch
drm-kms-locking". The commit I listed below is first bad.

Bisect result:
------------------------------------------
commit 7b24056be6db7ce907baffdd4cf142ab774ea60c 
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Wed Dec 12 00:35:33 2012 +0100

    drm: don't hold crtc mutexes for connector ->detect callbacks

    The coup de grace of the entire journey. No more dropped frames every
    10s on my testbox!

    I've tried to audit all ->detect and ->get_modes callbacks, but things
    became a bit fuzzy after trying to piece together the umpteenth
    implemenation. Afaict most drivers just have bog-standard output
    register frobbing with a notch of i2c edid reading, nothing which
    could potentially race with the newly concurrent pageflip/set_cursor
    code. The big exception is load-detection code which requires a
    running pipe, but radeon/nouveau seem to to this without touching any
    state which can be observed from page_flip (e.g. disabled crtcs
    temporarily getting enabled and so a pageflip succeeding).

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