problem with radeonhd driving DVI?

[Gary Jennejohn]

This question may not be appropriate for this ML, but I figured I'd
give it shot anyway.

I have a RADEONHD (HD 2400 Pro) based card which I normally use with
the DVI-I port on my TFT.  Of course I'm using the radeonhd driver.

BTW it's a PCIe card which I can't test in any other machine.  And it's
the only DVI card which I have.

However sometimes, for no apparent reason, the screen blanks for about
one second and then comes right back.  Sometimes this happens 3 or 4
times in a row and then stops for an indefinite period to then start
happening again.

Then there are days where I never see the problem at all.

I doubt that it's a thermal problem because I've also seen this in winter
when the room was cool.

It drives me crazy and makes it almost impossible to do any work.

If I use the VGA port I don't see this, but the display isn't nearly as
crisp and I can see the screen refreshing.

I'm wondering whether anyone else has seen this phenomenon?  I'm trying
to determine whether a) the TFT has a problem on the DVI input b) the card
has a problem on the DVI output c) radeonhd still has problems reliably
driving the output over DVI or d) the Xorg server gets a twist in its
panties and thinks that it has to blank the screen because it saw a
timeout (seems unlikely).

---
Gary Jennejohn