install all the needed packages acording to your architectures i386 or amd64, for example for amd64:
dkpg -i
linux-headers-3.5.0-030500rc4-generic_3.5.0-030500rc4.201206241635_amd64.deb
linux-headers-3.5.0-030500rc4_3.5.0-030500rc4.201206241635_all.deb
linux-image-3.5.0-030500rc4-generic_3.5.0-030500rc4.201206241635_amd64.deb
linux-image-extra-3.5.0-030500rc4-generic_3.5.0-030500rc4.201206241635_amd64.deb
then you have to add to kernel boot parameters:
acpi_backlight=vendor
i915.invert_brightness=1
you can make them permant by editing /etc/default/grub , editing this line:
Has been 2 years, but now i found a solution....for my emachines e725
here is kernel 3.5 rc 4 with all the i915 patches (i think):
http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v3.5-rc4- quantal/
install all the needed packages acording to your architectures i386 or amd64, for example for amd64: headers- 3.5.0-030500rc4 -generic_ 3.5.0-030500rc4 .201206241635_ amd64.deb headers- 3.5.0-030500rc4 _3.5.0- 030500rc4. 201206241635_ all.deb image-3. 5.0-030500rc4- generic_ 3.5.0-030500rc4 .201206241635_ amd64.deb image-extra- 3.5.0-030500rc4 -generic_ 3.5.0-030500rc4 .201206241635_ amd64.deb
dkpg -i
linux-
linux-
linux-
linux-
then you have to add to kernel boot parameters:
acpi_backlight= vendor brightness= 1
i915.invert_
you can make them permant by editing /etc/default/grub , editing this line:
GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash acpi_backlight= vendor i915.invert_ brightness= 1"
then run:
update-grub2
now you have your brightness working as on kernel 2.6-idontrememb er...
this patches has been liying around for a couple of months is a shame that no one from the canonical team, test them and create a ppa...