[Bug 94825] New: LVDS blank screen on GM45
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Tue Apr 5 03:27:26 UTC 2016
https://bugs.freedesktop.org/show_bug.cgi?id=94825
Bug ID: 94825
Summary: LVDS blank screen on GM45
Product: DRI
Version: unspecified
Hardware: x86 (IA32)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: rob at solution-space.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 122709
--> https://bugs.freedesktop.org/attachment.cgi?id=122709&action=edit
Boot log #1
[This is extracted the from the mailing list thead here:
https://lists.freedesktop.org/archives/dri-devel/2016-April/104142.html]
My setup is an embedded GM45 based board with a screen connected via 24
bit LVDS. After boot to console (no X), the screen is blank. Initially tested
on kernel 3.14.57, but the same happens on 4.5. This report uses kernel 4.5.0.
Older, pre-KMS versions of the kernel worked fine.
In the BIOS, the panel type is configured as "1920x1080 at 148.5M".
Attached boot log #1 includes Ville's patch "drm/i915: Read timings from the
correct transcoder in intel_crtc_mode_get()" but this code is not touched here
because the driver chooses to use the VBT mode.
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