On 06/17/12 11:07, Mitsuru IWASAKI wrote:
Hi,
Brightness can be adjusted using "acpi_call -p '\VBRC' -i n" (where n
is 0-15). acpi_call must be installed from ports. But this command
sets absolute brightness, so it can't raise or lower the brightness
unless you have the current value and I don't know how to get that.
This is the case on my T520.
X61 has the same problem. There are 2 video device object in ACPI
namespace, \_SB.PCI0.VID (vgapci attached but brightness control
doesn't work) and \_SB.PCI0.AGP.VID (has VBRC method but no driver
attached because of wrong _ADR).
The custom DSDT with the following patches and acpi_video(4) now
can adjust brightness level :)
http://people.freebsd.org/~iwasaki/acpi/tpx61.asl.diff
If you want to make the custom DSDT, I can help you.
Thanks!
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Would you be interested in seeing the X220 DSDT? It does sound similar,
and you sound like you can make sense of the Lenovo/IBM ACPI
branches...I think X220 has hooks for Nvidia optimus that are getting in
the way, or some trapdoor function needs to be called to tell ACPI we're
using the onboard intel (There is no Nvidia X220, but it looks like ACPI
thinks there is).
Matt
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