I have a Radeon 9200SE running with two monitors in MergedFB mode. Monitor0 is a DVI @1600x1200 and Monitor1 is VGA @1024x768. Everything works fine, glxinfo reports that direct rendering is on, until I run a GL application such as glxgears. When that happens Monitor 0 goes blank. Monitor1 stays on. It doesn't matter which monitor the glxgears window appears in, Monitor 0 always goes blank. When I close glxgears, monitor0 comes back. Its not that the monitor goes into powersaving mode, since the monitor powerlight stays green and not amber. It just goes black. I am using xorg 6.8.2. While glxgears is running it gets good framerates (624 FPS) so the dri is somewhat working.
This is a known problem with SE cards. I believe there is a bandwidth limitation when running the DVI port at high resolutions. try messing with the displaypriority option (see the radeon man page) and you may also want to try running your panel at 50 or 55Hz rather than 60Hz or whatever it's currently at.
Did Alex suggestions help?
you might also want to try the xorg from cvs as the handling of the tmds has been improved. Also, using modes with reduced blanking intervals help.
I'm having trouble convincing X that it should run at 55 Hz. I've tried things like: VertRefresh 55.0 And Option "DDCMode" "no" but it still insists on driving the monitor at 60 Hz, even though this should be an out of range mode, according to the VertRefresh. If you have any suggestions on how to get X to run at a different refresh rate, I'll be happy to try it.
(In reply to comment #4) > I'm having trouble convincing X that it should run at 55 Hz. I've tried things like: > > VertRefresh 55.0 > > And > > Option "DDCMode" "no" > > but it still insists on driving the monitor at 60 Hz, even though this should be > an out of range mode, according to the VertRefresh. If you have any suggestions > on how to get X to run at a different refresh rate, I'll be happy to try it. Currently, digital outputs do not accept user defined modelines on radeon.
(In reply to comment #5) > Currently, digital outputs do not accept user defined modelines on radeon. So does that mean it is impossible to try your suggestion from comment #1 ?
(In reply to comment #6) > (In reply to comment #5) > > Currently, digital outputs do not accept user defined modelines on radeon. > > So does that mean it is impossible to try your suggestion from comment #1 ? > not with out the patch from #2859 *** This bug has been marked as a duplicate of 2859 ***
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