I have upgraded to ubuntu 12.10 recently and found some issues.
- Mouse keeps disappearing randomly. It appears when we move the mouse.
- Brightness control not available in brightness&lock in system settings.
I tried some fixes but was not successfull. For the brightness issue tried changing to
GRUB_CMDLINE_LINUX="" into GRUB_CMDLINE_LINUX="acpi_osi=Linux".
3. But its not working.