ubuntu-x-swat team mailing list archive

[josejuan05 <727620@xxxxxxxxxxxxxxxxxx>]

@harry
I don't know if it means anything, but in newer kernels you may be unable to use that command, since /sys/kernel/debug may not be owned by you. A quick and dirty (if dangerous) solution would be to change the first line to 
chown "username(:group)" /sys/kernel/debug/ -R
where username is again your username and :group is the optional argument for the group ownership of the folder

Back to the bug, though, I did note one related oops in 50 boots
(looking through my logs). I did note when it happened - it did cause a
boot failure, but I did not give the evergreen error. Rather I got the
gart_set_page error. However, it didn't cause a kernel dump like in the
bisects. I only believe that the gart_set_page error to be related
because it does not show up in kernels which were susceptible to the
evergreen_cp_start oops. This still does not explain the race condition.

FWIW I did some plotting out of the bisects on paper and found that if
there was a commit that fixed the gart_set error it was between bisects
014 and 017.

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https://bugs.launchpad.net/bugs/727620

Title:
  [Radeon HD 5650 and 5470] Kernel BUG during recovery boot and in
  normal boot (Hybrid graphics)

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