[Bug 92251] New: Video blanks out after KMS switch

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=92251

            Bug ID: 92251
           Summary: Video blanks out after KMS switch
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.4
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: joshas at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 165081
  --> https://bugzilla.kernel.org/attachment.cgi?id=165081&action=edit
failed boot up log

Lenovo Miix 2 8 tablet with Intel Atom Z3740 CPU (Bay Trail). During boot
screen blinks and stays blank. Last seen message on screen is: "fb: switching
to inteldrmfb from EFI VGA". In very rare cases display comes back and boots up
successfully, but I was not able to find what causes successful boot. Looks
like it happens at random, as booting second time with same conditions doesn't
result in successful boot.
With nomodeset kernel parameter device boots up correctly, but without hardware
acceleration.
I've attached dmesg log generated with drm.debug=14 parameter of failed boot.

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