Hello hate_bugs_89
There's a new kernel available, can you please install it:

1 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-rc2-oneiric
/linux-headers-3.0.0-0300rc2_3.0.0-0300rc2.201106081532_all.deb

2 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-rc2-oneiric
/linux-headers-3.0.0-0300rc2-generic_3.0.0-0300rc2.201106081532_i386.deb

3 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-rc2-oneiric
/linux-image-3.0.0-0300rc2-generic_3.0.0-0300rc2.201106081532_i386.deb

reboot, and if not working add the acpi_backlight=vendor to the boot 
parameters, if not fix again, please attach here using the button below 'Add 
attachment or patch' the files:
/var/log/kern.log
/var/log/dmesg

Thanks
Fabio

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https://bugs.launchpad.net/bugs/790435

Title:
  Adjusting brightness is impossible

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