[ubuntu] Unresponsive Laptop After Monitor Goes to Sleep

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http://ubuntuforums.org – Karmic 9.10 I have a Toshiba laptop that I use an external monitor (laptop lid stays closed) with most of the time. I have the screensaver set to go on after 5 minutes. I also have the monitor (just the monitor) set to sleep after 10 minutes. With Karmic, if I come back to my machine after the monitor has gone to sleep and click the keyboard or mouse to wake the monitor up, I get nothing. The screen is blank. I've tried ctrl+alt+backspace (which I enabled) and ctrlt+alt+f1to get some kind of response, but nothing happens. I can take another computer on my network and ssh into my laptop and it appears to be functioning. To recover from this problem, I reboot from the ssh session. How do I fix this? (Hardware)