[Bug 87171] 3.18: i855GM KMS regression

[bugzilla-daemon at freedesktop.org]

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

--- Comment #5 from Bruno <bonbons67 at internet.lu> ---
Better description of the output with 3.18:

About top half of framebuffer is visible though pixel lines are not wrapped as
one would expect, they are wrapped somewhere around the middle (but not
exactly) so each pixel line from framebuffer fills two lines on monitor.

>From looking at difference between reg_dumper outputs under 3.17 and 3.18, the
major difference is:
3.17:
  DSPASTRIDE: 0x00002000 (8192 bytes)
3.18:
  DSPASTRIDE: 0x00001600 (5632 bytes)

Full difference:
3.17:
  DSPASTRIDE: 0x00002000 (8192 bytes)
  DSPABASE: 0x01000000
  DSPBCNTR: 0x58000000 (disabled, pipe A)
  DSPBBASE: 0x00020000
  VGACNTRL: 0x80000000 (disabled)
3.18
  DSPASTRIDE: 0x00001600 (5632 bytes)
  DSPABASE: 0x00020000
  DSPBCNTR: 0x00000000 (disabled, pipe A)
  DSPBBASE: 0x00000000
  VGACNTRL: 0xe104008e (disabled)

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