[Bug 594885] [NEW] Maverick kernel breaks video on resume from suspend

[Phillip Susi]

Public bug reported:

When resuming from suspend, my display never comes back out of power
save mode with the Maverick 2.6.35 kernel.  I first noticed this with
2.6.35-2, and today updated to 2.6.35-3 with the same results.  I have
installed today's daily mainline build from the kernel PPA,
2.6.35-999-061510, and this kernel does not have the issue.  Standard
Karmic and Lucid also work fine, so this is an Ubuntu specific
regression.

When the system does resume, it appears to be functioning other than the
display not being initialized correctly.  The lock keys on the keyboard
toggle the LEDs and I can hit ctrl-shift-alt-F1 to switch to a tty, and
then ctrl-alt-del and the system reboots.  I also tried booting in text
only mode and manually doing echo mem > /sys/power/state, and still no
video on resume.  If I then blindly type vbetool post, the display comes
on, but is all messed up since it is in the default VGA Text mode rather
than the graphics mode that the console driver expects it to be in.
This is all with the amd64 build using an ATI Radeon HD 4850.  I can see
nothing out of the ordinary when reviewing the syslog either; as far as
the kernel is concerned, it thinks it resumed just fine.

Any pointers for further debugging are welcome.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: regression-potential

** Tags added: regression-potential

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Maverick kernel breaks video on resume from suspend
https://bugs.launchpad.net/bugs/594885
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