After upgrading to Hardy, I noticed that the bug 157691 has not been fixed.

If you experience a crash when you close the lid cover of your HP 6510b business notebook, try this:

echo 1 | sudo tee /proc/acpi/video/C098/DOS > /dev/null

If this works, add the command

echo 1 > /proc/acpi/video/C098/DOS

to /etc/rc.local.