@duncand: NickA comment #23 gives the workaround. To sum it up, you need
to create a file (/etc/modprobe.d/radeon-kms.conf) with a single command
in it. This will tell your video driver not to load the kms module (kms
stands for kernel messaging service). This fixes the suspend problem but
it does degrade the video quality. I think the trade-off is worth it to
be able to close the lid to my laptop and have it go into suspend, then
open the lid to my laptop and have it come back perfectly every time.
OK, now here's how to implement the fix.
$ echo "echo options radeon modeset=0 > /etc/modprobe.d/radeon-kms.conf" >
suspend.sh
$ chmod ugo+x suspend.sh
$ sudo ./suspend.sh
The first command creates a shell script called "suspend.sh" that will
create the file "/etc/modprobe.d/radeon-kms.conf" with the command "echo
options radeon modeset=0" in it.
The second command make "suspend.sh" executable.
The third command executes "suspend.sh" as the superuser. You need to be
the superuser to edit files in the "/etc/modprobe.d/" directory.
That's it! You should now shutdown and restart your laptop and you will
be able to suspend without any problems. As I said, the video will look
pretty bad and your desktop icons will be ugly but I've found the system
to be very usable this way. If you ever want to go back, just delete
"/etc/modprobe.d/radeon-kms.conf" as the superuser and your system is
back the way it started.
HTH,
Andy
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[Dell Computer Corporation Inspiron 600m] suspend/resume failure
https://bugs.launchpad.net/bugs/471872
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