The following in-tree (latest linux-2.6 git tree) drivers are desktop/laptop
devices and likely do not want the "dim and power off backlight on
backlight_device_unregister" behavior:
drivers/video/aty/*
drivers/video/riva/fbdev.c
drivers/video/nvidia/nv_backlight.c
drivers/misc/msi-laptop.c
...
I have CC'ed the relevant people (please forgive me any ommissions) for the
drivers listed above, so they can chime in if their driver should retain the
"dim and power off backlight on backlight_device_unregister" behaviour.
Hm. In the case of some drivers the hardware state on x86 is set back to
text mode in some cases. So do we in that case dim the backlight?