ubuntu-x-swat team mailing list archive

["Ap. Syvertsen" <727620@xxxxxxxxxxxxxxxxxx>]

I have a Dell Aspire Timeline X 4820TG with Radeon HD5650 and integrated
intel graphics.

This bug used to bugger me about every second boot, but after installing
tons of different kernels it's actually been more sporadic. I don't know
whether that is because I spend more time in the GRUB-menu, clicking to
Previous versions and then choosing 2.6.38-8.

Anyways, I added the drm.debug=0x0e for all kernels and kept booting
till I got some good and bad boots. Chronologically I had 1 good, 3 bad
and 1 good boot, but in the attached kern.log it only shows 1 good, 1
bad, 1 good. In all the bad boots it stopped with a completely black
screen (no backlight) but I was able to switch xserver (or something) by
pressing Alt+F1, Alt+F2 and Alt+F7. The system did not respond to Ctrl-
Alt-Del but printed some SAK line when pressing AltGr+SysRq+K without
doing anything.

The last line in one terminal on all bad boots was this:
[drm:intel_prepare_page_flip], preparing flip with no unpin work?

The last thing in the other terminal was the call trace  ending with this:
[   27.218815] RIP  [<ffffffffa0569b16>] evergreen_cp_start+0x56/0xc80 [radeon]

Hope this helps, let me know if you need more info.

** Attachment added: "kern.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/727620/+attachment/2134808/+files/kern.log

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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)