Hi Henning Moll !
can you help me (again ;) ) ?
 I added your boot parameters to "quiet splash " but they don't work...
 that is what i have done in /etc/default/grub :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=legacy"
is it correct?
i had also tried the procedure that worked on karmic 
(https://wiki.ubuntu.com/LaptopTestingTeam/Old/AcerExtensa5635Z)  
and the brightness work perfectly but my cursor disappear and the splash screen 
appear with a bad resolution

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lucid extensa 5635z backlight dimming not working at all
https://bugs.launchpad.net/bugs/518002
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