on 11/07/2011 19:08 Vitaly Magerya said the following:
Andriy Gapon a...@freebsd.org wrote:
From what I heard this isn't a problem with FreeBSD ACPI code, it's
a problem with Samsung firmware. AFAIK to get brightness controls
working on Windows you need to setup Samsung software that uses
undocument BIOS interface for it's function.
Linux has what appears to be a reverse-engineered driver [1] that
does the same. Someone (probably me) needs to port it.
Maybe, maybe not... Can you please verify which driver Linux actually uses
on
your system?
Nothing but generic ACPI; samsung-laptop dirver is not used because
it doesn't white-list my laptop model (and for some reason fails
to attach when I load it with force=1, even though my BIOS definitely
has the signatures it is looking for).
At any rate, brightness controls don't work under Linux.
I officially give up on this case then :-)
Maybe you'd want to report this problem to Linux folks too.
If they come up with a fix we may borrow it from them.
So I can see how this behavior can easily confuse our acpi_video driver.
I see that Linux acpi video driver has some quirks in it, but not sure if it
is
able to handle this kind of issues. I would doubt that.
Maybe you would feel adventurous enough to experiment with hacking your DSDT
some
more. For a start I would just try to remove that level % 10 == 0 check.
Sure. I removed those checks, but there isn't much difference.
Here's a sample transcript:
# sysctl hw.acpi.video
hw.acpi.video.crt0.active: 0
hw.acpi.video.lcd0.active: 0
hw.acpi.video.lcd0.brightness: 5
hw.acpi.video.lcd0.fullpower: 100
hw.acpi.video.lcd0.ecoomy: 5
hw.acpi.video.lcd0.levels: 100 5 15 24 30 45 60 80
hw.acpi.video.ext0.active: 0
hw.acpi.video.out0.active: 0
# sysctl hw.acpi.video.lcd0.brightness=45
hw.acpi.video.lcd0.brightness: 5 - 45
# sysctl hw.acpi.video.lcd0.brightness=100
hw.acpi.video.lcd0.brightness: 45 - 100
No brightness changes actually occur during this.
--
Andriy Gapon
___
freebsd-acpi@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-acpi
To unsubscribe, send any mail to freebsd-acpi-unsubscr...@freebsd.org
