[Bug 82880] New: Black screen on modesetting with Dell Venue 8 Pro (older firmware) on 3.16.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82880

          Priority: medium
            Bug ID: 82880
          Assignee: chris at chris-wilson.co.uk
           Summary: Black screen on modesetting with Dell Venue 8 Pro
                    (older firmware) on 3.16.x
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: adamw at happyassassin.net
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/intel
           Product: xorg

Created attachment 104995
  --> https://bugs.freedesktop.org/attachment.cgi?id=104995&action=edit
boot log with drm.debug=15

This is kind of a follow-up to
https://bugzilla.kernel.org/show_bug.cgi?id=68451 . As of kernel 3.16 support
for the problematic Baytrail tablets with DSI displays is supposed to be
present in the kernel, and some people have reported success. However, I don't
get a working display on my test system, a Dell Venue 8 Pro. The behaviour is
clearly different to how it was, but I get a black screen when modesetting
kicks in.

I am running an older firmware on my V8P - A04 - as updating requires Windows,
and I wiped the Windows install. This may be related to the bug, or not (it's
not entirely clear).

I'm attaching a boot log from kernel 3.16.1 with drm.debug=15 set in the kernel
parameters. The tablet was booting with no external display attached, only the
internal DSI-connected 800x1280 8" panel. The correct resolution seems to be
detected, but the screen blanks as soon as KMS kicks in (very early boot
messages are visible).

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