Comment 60 for bug 34155

I'm attempting to get standby/resume to work on my c640 running Ubuntu 10.04.
I'm pretty sure that it had been working in past releases, but isn't working reliably now...

I tried modifying /etc/X11/xorg.conf with the instructions on the quirks page here
https://wiki.ubuntu.com/X/Quirks#ATI%20Radeon%20Driver%20Quirks

resulting in

Section "Device"
    ...
    Option "AGPMode" "x"
EndSection

where x is some number 1, 2, 4 or 8.

I found that when using AGPMode 4:

I can suspend and resume with the power plugged in selecting standby from the shutdown menu and resume by pressing the power button.

If I select suspend from the menu, and then close the lid, the computer will turn back on, and the backlight will turn on, but the screen remains blank and black. There is no response to keyboard or mouse input, no ctrl+alt+F#. The only option that works is to hold down the power button, and reboot.

When I shut the lid, the laptop goes into standby, and when the lid is opened again the laptop resumes, but the video is all garbled into various colors and strips. The area where the mouse pointer is occasionally has a blotchy square where it should be. I can switch to a terminal and that works fine, no graphical issues there. But the only way to get back to X11 is to use ctr+alt+backspace or run "sudo service gdm restart" from a terminal.

I can't think of anything else to tell...

I've tried attaching the xorg.conf file that I'm using.