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Summary: OpenGL applications with Radeon MergedFB causes one
monitor to blank
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.
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