[Bisected] Output to external monitor is broken (Re: Linux2.6.31-rc9)

From: Carlos R. Mafra
Date: Sun Sep 06 2009 - 10:23:25 EST

On Sat 5.Sep'09 at 16:54:27 -0700, Linus Torvalds wrote:
> Go wild, and please give this a final round of testing.

The output from my Vaio laptop to the external monitor (LG Flatron M228WD)
is broken now. The screen is all messed-up once the boot messages from the
kernel appear on it (see the picture at the link below).

I bisected it down to f8aed700c6ec46ddade6570004ce25332283b306 ("drm/i915:
Set crtc/clone mask in different output devices"). I doubled checked
that reverting this commit from 2.6.31-rc9 fixes the problem.

The picture of the bad output is here:

as well as my config:

and dmesg (with the above commit reverted):

(the vga=0x0364 in the command line does not work since I
enabled KMS, so I get a prompt in the beginning from which I
choose vga=0. But the above regression is not affected by this
choice because the command line was always the same during

If there is anything else I can do, just let me know.

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