[Bug 62771] New: Screen turns to coloured snowstorm (or blanks) when KMS kicks in

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62771

          Priority: medium
            Bug ID: 62771
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Screen turns to coloured snowstorm (or blanks) when
                    KMS kicks in
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mrdemeanour at jackpot.uk.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 77065
  --> https://bugs.freedesktop.org/attachment.cgi?id=77065&action=edit
dmesg with drm.debug=0xe

Linux boots, but display 'fails' when i915 KMS kicks in. Console input is
possible, and system is useable via ssh; X can be launched from console.

'Fails': on tested 2.6 and 3.2 kernels, the entire screen is taken over by a
colourful snowstorm. On 3.8.4, the snowstorm flashes briefly then the screen
blanks; disconnecting and reconnecting the display again yields a colourful
snowstorm. Launching X will also transform the black screen into a snowstorm.

I've tried with built-in i915 (fails on transition from initrd), loadable
module (fails when i915 loads), and with i915 in initrd (fails immediately).

The system is a Acer Revo RL80, which has only DVI-I output. The display is a
projector with native resolution 1024x576.

With KMS disabled in the kernel, the failure doesn't occur; but i915 cannot be
used for X.

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