Xen devel - May 2006 - dom0 issues with switching from X to console or starting X

We are seeing a number of machines that (simply running dom0) either fail to
start X (for reasons other than the machine
in native mode only working via the frame buffer driver) or fail to switch from
(or back to) X to one of the consoles.
This normally looks like a hang, though at least in some cases it''s
only X apparently sitting in an endless loop. From
looking at data so far obtained from these systems this appears to be an issue
with accessing the video BIOS, in either
not being to properly run this in vm86 mode (on 32 bits) or under emulation (on
64 bits). Has anyone seen similar
behavior and possibly knows more about this?

Thanks, Jan

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