[Bug 76770] New: [I830M] KMS sets garbage video mode
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sat Mar 29 01:18:38 PDT 2014
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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