[Bug 94825] New: LVDS blank screen on GM45

[bugzilla-daemon at freedesktop.org]

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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