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SubjectX unusable rebooting with kexec
For the first time I used kexec, and decided to test it to reboot from 
3.0.0 to 3.0.1-rc1. Apparently, all went well until startx. As soon as
my window manager appeared, the graphics were so corrupt and didn't show
any text, that the only solution was to reboot, after retrying startx a
few times. I also tried kexec a second time, rebooting the same
3.0.1-rc1 kernel, with no luck.

Doing a diff against both dmesg, I noticed the following changes:

MTRR variable ranges enabled:
...
- 2 disabled
+ 2 base 00D0000000 mask FFF0000000 write-combining
pci 0000:01:00.0: Boot video device
-PCI: CLS 4 bytes, default 64
+PCI: CLS mismatch (4 != 32), using 64 bytes
What can I do, if anything, to find the cause of this corruption and
make kexec work as expected ?

The video card is a Radeon HD 5450.


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