[Bug 71977] New: Modesetting on Dell Venue 8 Pro (Bay Trail) produces garbled output (3.11, 3.12) or blank screen (3.13)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71977

          Priority: medium
            Bug ID: 71977
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Modesetting on Dell Venue 8 Pro (Bay Trail) produces
                    garbled output (3.11, 3.12) or blank screen (3.13)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: blocker
    Classification: Unclassified
                OS: Linux (All)
          Reporter: awilliam at redhat.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

I just bought a Dell Venue 8 Pro - an 8" tablet based on the Bay Trail platform
- to try and get Fedora running on it.

After hacking things up to produce a bootable 32-bit UEFI image, next come the
kernel bugs :)

If I boot an image with a 3.11 or 3.12 kernel and default boot arguments, the
display becomes badly garbled as soon as modesetting kicks in; it looks like it
selects the wrong mode. If I boot an image with kernel 3.13.0-0.rc1.git0.1 ,
the screen just goes blank (backlight still working) when modesetting kicks in.

For now I have no further details, as I don't have a USB hub to hand so there's
no way I can get any out. I'm going to pick up a USB hub tomorrow so I can have
both the boot media and a keyboard connected, and I should be able to get some
more useful info at that point.

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