[Bug 34155] Re: sleep and hibernate don't work on Dell C640 (regression from breezy)

[Ripper]

Dell Latitude C640, Ubuntu Edgy.

In default configuration, I could not suspend nor hibernate. After
resuming suspend, there were a few lines and a box (mouse cursor) on the
screen, could not restore image in any way. Trying to hibernate simply
shut down the computer like power off.

After adding "vga=0" to boot parametres, the suspend works. At least a few tries worked. Will see in the future.
The hibernation does nothing, but there's a message in console that it couldn't find swap partition or something. I don't have swap partition, so that's maybe my fault. Cannot try hibernation hence.

I also tried follow this thread
http://www.ubuntuforums.org/showthread.php?t=187655
and commented
# SAVE_VBE_STATE=true
# POST_VIDEO=true
lines in /etc/default/acpi-support. This works too, I don't have to add the "vga=0" line. Which is better solution? Are there any drawbacks in either of them?

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sleep and hibernate don't work on Dell C640 (regression from breezy)
https://launchpad.net/bugs/34155