blank external DVI on Thinkpad T40

Gilad Arnold arnold at
Wed Feb 25 12:11:53 PST 2009

Alex, thanks for the quick reply.

On Wed, Feb 25, 2009 at 02:55:49PM -0500, Alex Deucher wrote:
> Sounds like display underflow.

I wonder what that is and what causes it?

> Try disabling the LVDS if you aren't using it.

I tried adding this to xorg.conf:

Section "Monitor"
  Identifier   "LVDS"
  Option       "DPMS"
  Option       "Ignore" "true"

Xorg fails to initialize with the "no screens" error (monitors were
found but none has a usable configuration). I also tried 'xrandr
--output LVDS --off', but the DVI-0 output remains blank. Any other way
I can disable LVDS?

> Another option is to increase the priority of the display controllers:
> Option "DisplayPriority" "HIGH"

Added this option under the device section of the radeon driver. Same

Any idea?

Thanks again.


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