Comment 3 for bug 1168967
Revision history for this message
| Greg Ward (gward) wrote Re: regression: no video after upgrading kernel, mesa, libc, and several other packages (ThinkPad T500) | #3 |
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7020100
(Get the code!)
Workaround #1:
> I guess I'll repartition and try installing raring in the new partition.
success! the bug has been fixed in Ubuntu 13.04. This is still an update regression with 12.10; my ThinkPad T500 worked just fine on March 31 and video stopped working on April 13. But at least the next version of Ubuntu is not affected.
Workaround #2: boot Ubuntu 12.10 with kernel parameter "nosetmode". Success! I also removed "quiet" and "splash" from the kernel command line, so I see a nice noisy boot process. X starts fine, and performance is just fine. Text consoles appear to be plain old-fashioned text mode, just like back in the old days before KMS. There is a tiny flicker switching between text consoles and X, again just like in the old days.
Workaround #3: boot Ubuntu 12.10 with kernel parameter "vga=0x0f00" (standard 80x25 text). Fails. I get the same noisy boot process as before (again I have removed "quiet" and "splash"), in glorious black-and-white 80x25 text. But the screen goes black after a while -- presumably when starting X?
Anyways, the evidence points to this being a bug in kernel mode setting, so I'm changing the affected package.