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Making X11 work reliably on a Xen 4.1 dom0, with some caveats

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http://www.linuxquestions.org – I currently have a workstation set up with Debian Wheezy as a dom0 on top of Xen 4.1 (from the Wheezy repository). I need to have X11 running and stable on the dom0, on this workstation. X11 has been very unstable with the video card, a Radeon HD 4200; switching VTs tends to corrupt the screen, and X sometimes segfaults on start. Caveat 1: I can't use the Wheezy nonfree repo, which means X has to work without the proprietary Radeon firmware. Caveat 2: I'm stuck with a 1680x1050 monitor, and I don't know if the video BIOS supports widescreen resolutions. If it doesn't, using the vesa driver w (HowTos)