*** This bug is a duplicate of bug 89853 ***
https://bugs.launchpad.net/bugs/89853
One root cause of inability to find a proper X resolution is a flaky
EDID transfer from the BIOS. This is due to code added to vm86.c to try
and resolve noisy error messages from the auditing subsystem. This is
not an issue on non-x86 systems which use the x86emu code instead of
vm86 to talk to the BIOS of the ATI card.
The definitive symptom here is if the EDID hex output in Xorg.0.log is
missing, or mostly zeros.
The definitive work-around until the vm86.c kernel bug is fixed, or a
more clever approach to getting the EDID data is added to the X server,
is to add the line:
Option "Int10Backend" "x86emu"
to the ServerLayout section of xorg.conf.
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Xorg does not detect Ati Radeon mobility x1300 during Ubuntu i386 7.04 install
https://bugs.launchpad.net/bugs/107711
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