Bug#567034: [xserver-xorg-video-intel] when using KMS, X puts the monitor directly into power saving mode upon startup[945G]

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Joe!

Joe Neal wrote:

> When X starts the monitor immediately flashes that it is going into power 
> saving mode, before a display manager has a chance to start.   It wakes upon 
> entering ctl-alt-F1 through ctl-alt-F6 but returns to power saving mode with 
> control-alt-F7.
>
> Top, etc indicates that X is in fact running. 
>
> Disabling KMS solves the problem
>
> Attached is a log from one of the failed X startup attempts rather than the 
> most recent successful one without KMS.

So if I understand correctly, when you switch to vt7, the screen goes
black and the little orange "I'm saving power" LED turns on.  Sounds
like fun.  I assume this happens every time, right?

I'm also guessing "xset dpms force on" does not help.

I did not find a change that would obviously fix this, although
v2.6.37-rc1~77^2~31^2~1 (drm/i915: mark display port DPMS state as
'ON' when enabling output, 2010-10-03) seems vaguely relevant.  Does
this still happen with the kernel from sid?  If it does, we should
report this upstream; otherwise, we can start searching for a fix in
earnest to backport to squeeze.

Thanks for a nice report, and sorry for the slow response.
Jonathan