I isolated the problem.
I have both kubuntu and ubuntu 12.04b2 installed. Whenever one of them
update the kernel, it replaces the grub2 configuration. Anyway, the
other (k)ubuntu is detected by /etc/grub.d/30_os-prober and its entries
are added to grub menu.
If I select the entry generated by os-prober, there is no problem with
VGA. If I use the main entry, I got the problem. The difference from the
default entry (generated by /etc/grub.d/10_linux) and os-prober are:
recordfail
gfxmode $linux_gfx_mode
insmod gzio
I guess the gfxmode present only in 10_linux entries that causes the
problem. Maybe it is related to the fact that my two monitor support
different max resolutions.
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https://bugs.launchpad.net/bugs/973866
Title:
VGA and second monitor on ATI HD 6670 (Dell XPS 8300) is broken
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