Update : the second way is using i2c to control backlight.
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https://bugs.launchpad.net/bugs/818826
Title:
backlight brightness control won't work in 2011
ACPI DSDT has actually two paths for changing backlight.
One is simple to understand and is using SMI Command Port B2, but only works
when booting with BIOS.
The other is quite complicated (for me acpi noob) and is using a ressource
called smbus-ddcblc.
I don't know if the backlight acpi is
Update : linux 3.2-rc7 boots that imac 12,2 in EFI mode without any patch or
trick.
radeon drm is working. Brightness is not.
I dualboot on osx to change the backlight, which is saved and restored upon
reboot (or halt).
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/sys/class/backlight/acpi_video0/brightness
is present, but does not have any effect when imac is booted in EFI mode.
It does work when booted in legacy BIOS mode.
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xdg-mime default chromium-browser.desktop x-scheme-handler/http
xdg-mime default chromium-browser.desktop x-scheme-handler/https
instant effect.
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Probably a duplicate of #621507
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Schema org.gnome.Empathy not installed
https://bugs.launchpad.net/bugs/674374
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