* Chris Wilson -- Thursday 12 May 2011:
So we think that enabling the plane at this point is masking a bug in our modeset, or that some side-effect of writing those registers or waiting for that vblank has a vital latching or delay that we have not accounted for.
Attached are the requested register dumps:
intel_reg_dump__nomodeset.gz ___no kms -- no corruption
intel_reg_dump__bad.gz ___with kms -- corrupted screen contents with staircase shaped and horizontally stretched scan lines. Unreadable.
intel_reg_dump__lid.gz ___after closing and reopening lid. The text is now readable, but horizontally stretched. It looks like there's a dark pixel between any pair of legitimate font pixels.
intel_reg_dump__x11.gz ___after starting x11. Now both the x11 screen and virtual terminals look right.
(BTW: there's also still the problem that the backlight remains off until I press the "screen darker" key. Maybe this problem is related? https://bugzilla.kernel.org/show_bug.cgi?id=31522).
m.