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Patch allows the backlight to be manipulated under gnome on apple powerpc
based NV30 machines. It works fine on my powerbook, and should also work
for older NV17/NV18 machines.
Note that older powerpc specific tools (pbbuttonsd) have some problems with
this implementation (because the device is not yet there at the start time
of the daemon, and the code makes incorrect assumptions about the max
brightness values). However, IMHO these things can and should be addressed
in the daemon.
Some style/warning fixes applied by Stuart Bennett <stuart@freedesktop.org>
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Avoid failure to build on old kernels with CONFIG_BACKLIGHT_CLASS_DEVICE set
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Loading nouveau.ko would fail with unknown symbols, if the backlight
class device support is not provided in the kernel. Let's make the
backlight support dependant on the kernel configuration.
This is a bit ugly, the proper way would be to check for the config in
Makefile.kernel whether to build nouveau_backlight.o at all, and if not,
nouveau_drv.h should provide the stubs.
Signed-off-by: Pekka Paalanen <pq@iki.fi>
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Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Pekka Paalanen <pq@iki.fi>
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Several nvidia-based systems don't support backlight control via the
standard ACPI control mechanisms. Instead, it's necessary for the driver
to modify the backlight control registers directly. This patch adds
support for determining whether the registers appear to be in use, and
if so registers a kernel backlight device to control them. The backlight
can then be controlled via existing userspace tools.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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