prboom (SDL) uses a mutex, waiting for Xorg to release the framebuffer. I got it working before by commenting out that framebuffer mutex wait in the SDL code... You still get little glitches now and then on the top menu bar, when the desktop writes there, but it "mostly works"... It would be better to tell Xorg to let go of the framebuffer, but we need to take what we can get.
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