Sudden blank black screen

[DarkKnight BrightWarrior]

Hello all,

I am using kernel 2.6.38 with X Server 1.9.4 with radeon open source driver.

I am facing a strange issue. I am using DVI Monitor. Sometimes while doing
logout and login the display is lost. Monitor shows a blank black screen and
monitor power led blinks on and off continuously.
And after sometime, on the top left corner of monitor I can see message
"digital" and "analog" alternately displayed.
Any clicks and keyboard shortcuts are not bringing the display back. I can
able to ssh to the system. I checked ps command output and xorg log but I
could not find any differences from a normal logged in system. From ssh
session I can see Xorg and all other process running fine. But srangely,
from ssh session If I run  chvt 2 and chvt 7 the display comes back. I mean
switch to other terminal and coming back to graphics terminal makes the
display on. What could be the reason for this?


Thanks
Praveen
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