[Bug 87171] New: 3.18: i855GM KMS regression

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87171

            Bug ID: 87171
           Summary: 3.18: i855GM KMS regression
           Product: xorg
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Keywords: regression
          Severity: critical
          Priority: medium
         Component: Driver/intel
          Assignee: ville.syrjala at linux.intel.com
          Reporter: bonbons67 at internet.lu
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: daniel at ffwll.ch

Created attachment 110648
  --> https://bugs.freedesktop.org/attachment.cgi?id=110648&action=edit
Displayed result with 3.18

On Acer TravelMate 66x with i855GM switching from 3.17 to 3.18 kernel scanout
to LVDS becomes mis-configured.

It looks like pixels are being displayed "interlaced" both horizontally and
vertically so that first pixel is at its expected location, pixel right of it
is two pixes further to the right, pixel at half screen (or is it 1/4 of
screen) is located right below first pixel.

See screenshots for visual representation. Further debug details will follow
with some delay, as well as bisection.

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