i really think that this is no xorg bug... my apologies
how can i be so sure ?
well the trick with setpci was cool
but when i modified the grub configuration to disable KMS with "nomodeset" guess what ....
all the brightness worked again
fn+ brightness
xbacklight
....
so i'm pretty sure its not an xorg bug :( sorry
i'll search for a know KMS bug, or open one if it does not exist
i really think that this is no xorg bug... my apologies
how can i be so sure ?
well the trick with setpci was cool
but when i modified the grub configuration to disable KMS with "nomodeset" guess what ....
all the brightness worked again
fn+ brightness
xbacklight
....
so i'm pretty sure its not an xorg bug :( sorry
i'll search for a know KMS bug, or open one if it does not exist