[Bug 63609] New: drm/i915 composite TV-OUT shows vertical flickering with kernel >= 3.6.11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63609

          Priority: medium
            Bug ID: 63609
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: drm/i915 composite TV-OUT shows vertical flickering
                    with kernel >= 3.6.11
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: pierre.assal at verint.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 78092
  --> https://bugs.freedesktop.org/attachment.cgi?id=78092&action=edit
dmesg with drm.debug=0xe

Hi

I have a custom PC with a custom motherboard from Advantech which has a E2160 @
1.80GHz intel CPU and the i915 intel chipset.

I have recently updated the kernel that I use from version 2.6.39 to 3.6.11 and
I have a problem with the i915 composite TV-OUT. This video output shows
vertical flickering with the new kernel. Also I have noticed that the TV-OUT is
no more enabled at kernel boot (it was enabled with kernel 2.6.39). 

Then I have tried with the latest kernels 3.8.7 & 3.9-rc7 from krnel.org. With
these kernels, the TV-OUT is now enabled at kernel boot but is still flickering
vertically.

Then I have tried with kernels 3.0.73, 3.2.43 and finally 3.4.40. And I have
found that the TV-OUT seems to have been broken in kernel 3.4.40.

Can anyone help me in fixing this issue with kernel 3.6.11?

Attached you will find dmesg logs with drm.debug=0xe.

Regards,
Pierre Assal

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