Don' boot with kernel 2.6.31

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http://forums.fedoraforum.org – Hi... I have installed fedora rawhide on a test partition, and after the update (I have disable all F11 repo and enable rawhide repo + rpm-fusion free and nonfree rawhide) when I want to boot on a 2.6.31 kernel, I see the progression bar, but after nothing appear... I test with 2.6.31-0.76.rc3.git4.fc12.x86_64 and 2.6.31-0.81.rc3.git4.fc12.x86_64 kernel for same result. After reboot my laptop, I boot on my F11, mount ./ of rawhide to see the log, but there are no log in /var/log for time when I want booting on 2.6.31 kernel... On /boot partition of rawhide I see a strange thing: config- is a "type Document texte brut" , and i can boot on this but config-2.6.31-0.76.rc3.git4.fc12.x86_64 and config-2.6.31-0.81.rc3.git4.fc12.x86_64 are noted as Type: sous-titre MPSub and I am not able to change that... Do you know what's happen? (HowTos)