[Bug 76770] New: [I830M] KMS sets garbage video mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76770

          Priority: medium
            Bug ID: 76770
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [I830M] KMS sets garbage video mode
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mroos at linux.ee
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 96579
  --> https://bugs.freedesktop.org/attachment.cgi?id=96579&action=edit
dmesg

Somewhere after 3.12, KMS has started to set garbage video mode with too large
letters and vertical offset on Thinkpad X30 with Intel 830M graphics. 3.14-rc8
is still problematic.

Bisecting is tricky - it seems the bug only happens with some kernels but not
others from the buggy range. I did 2 bisections, one from 3.13 to 3.12 and one
from first known-bad commits to 3.12 with lastest gcc 4.8 from Debian unstable.
These lead me to differnet results that both reside in lustre commits, but
lustre is not compiled for this laptop at all.

Same kernel that exhibits the bug seems to exhibit it always.

When X starts, it sets normal graphics mode and works with no problems.

Attached are dmesg with drm.debug=0x0e, lspci -vvv, config and 2 bisection
logs.

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