I upgraded to (64 bit) Karmic (alpha 3 I believe) the other day on my 5810T in hopes of solving some (relatively minor) problems, including some of the above. Very smooth upgrade, no difficulties. I've experienced no lockups. As for the problems:
Originally Posted by TwiceOver
Hibernation and suspension now work, though about half the time I have to restart compiz after the wake up. (I simply stuck a custom application launcher on the panel so can do that with a single click.)
The brightness hotkey now works, although this required adding "nomodeset" to the boot parameters. The hotkey often ceases to work after waking up from hibernation or suspension but can be resurrected from a terminal with the command
which I've simply aliased to "br".
xrandr --output LVDS --set BACKLIGHT_CONTROL native
The touchpad on/off key still does not work properly for me; it successfully deactivates the touchpad but pushing it again does not reactivate it. As with brightness, it can be reactivated from the command line:
And again I've added an appropriate alias.
sudo modprobe -r psmouse && sudo modprobe psmouse
I am still unable to get the cd/dvd drive to read a cd/dvd that I put into the drive. I have to say: How hard can this be? Evidently harder than I think.
Anyway, overall some reasonably good improvements for the Acer line with Karmic, esp considering it is still alpha. Hopefully we can look forward to more in the release version.