I have an Acer Aspire One netbook, which I'm using with Ubutu Netboox Remix 9.04. With a clean install, suspend seemed to be working fine. However, now that I've installed quite a lot of extra packages and done some configuring (bluetooth dialup, and such), I seem to have lost the suspend functionality.
When I try to go to suspend, the screen only shows a blinking text-mode cursor at the top left corner, and the computer never gets suspended. The only way out is a hard restart.
How can I troubleshoot the issue? For example, are there some specific log files I should be looking at, or such? Since the suspend was working on the clean install (and on the original linpus linux installation that came with the computer) I know this is not an unsolveable hardware compatibility problem. Removing/installing packages one by one would, of course, be an option - but this would be awfully time-consuming, since I have a lot of extra packages and no idea when the problem appeared. As far as I understand, I didn't install anything too weird that might be expected to cause such issues.
EDIT: The new release, Ubuntu Netbook Remix 9.10, fixed this. I can now suspend the netbook even with the memory extension mounted. This, however, does not work exactly how I'd hope... More information in new thread: Force unmount in Ubuntu, to fix problems after netbook sleep mode
Answer
Suspend is known not to work with SD cards inserted. Remove SD cards and other peripherals you may have attached before suspend. There's a good explanation on the Gentoo wiki as to why suspend is problematic with an SD card present: SD Cards and Suspend
If the problem persists, check the logs in /var/log, specifically syslog, messages and Xorg.0.log. There's a handy GUI tool to view the system logs that you can use: System > Administration > Log File Viewer (or something similar).
You should also look at the Ubuntu Community documentation on Acer Aspire One here and here.
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