Comment 2 for bug 443120

I have a similar though not quite identical issue.

On an Acer Aspire 3050, I did a fresh install of Mint 8 then updated all packages first with the graphical, then also updated the kernel and xorg with aptitude.

Telling the system to sleep seems to work until I wake it up. The screen remains blank and I can't interact with it at all. I've tried Jace's trick of adjusting the brightness with the Fn+[key] combo. I've also tried to blindly open a terminal, run 'sudo reboot' and enter my password. Pressing and holding the power button doesn't shutdown. The Caps/Num Lock keys don't turn on their respective LEDs. The only way I can get back is to disconnect the power and remove the battery.

I will add the output of 'inxi -F' shortly.