Intel graphics card brightness control issue
Ethan W. House
graphics card. The acpi values change but no effect takes place.
ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.brightness=50
hw.acpi.video.lcd0.brightness: 100 -> 50
ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.active=1
hw.acpi.video.lcd0.active: 0 -> 0
I also have an issue were upon resume by machine reboots. I believe the two
might be related but I am not sure.
I found a couple of other email chains with similar issues but most of them
have been inactive for more then a year.
---
Ethan House
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Matthias Petermann
Zitat von "Ethan W. House" <eho...@csh.rit.edu>:
> What could be causing my brightness control to not work on my Intel
> graphics card. The acpi values change but no effect takes place.
>
> ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.brightness=50
> hw.acpi.video.lcd0.brightness: 100 -> 50
> ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.active=1
> hw.acpi.video.lcd0.active: 0 -> 0
>
> I also have an issue were upon resume by machine reboots. I believe the two
> might be related but I am not sure.
>
> I found a couple of other email chains with similar issues but most of them
> have been inactive for more then a year.
Which Laptop model do you have? This issue appears a bit familiar to
me[1] - I have the same on my Thinkpad. As a workaround you could try
to change the brightness by direct ACPI calls.
Preparation:
* install sysutils/acpi_call
* kldload acpi_call
Change brightness:
* acpi_call -p '\VBRU' (Brightness Up)
* acpi_call -p '\VBRD' (Brightness Down)
It might be that these calls are specific to Thinkpads, not sure if
they work with others. You can try to find out with acpidump[1].
Kind regards,
Matthias
[1] http://www.freebsd.org/cgi/query-pr.cgi?pr=amd64/181357
[2] http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
--
Matthias Petermann <matt...@petermann-it.de>
Ihr Partner für anspruchsvolle IT-Lösungen
www.petermann-it.de - lösungsorientiert, innovativ und erfolgreich
Ethan W. House
similar to the error I get when I use xbacklight "No outputs have backlight
property".
I have a Lenovo Thinkpad x230.
I will start playing around with acpidump after work.
Ethan House
On Wed, Sep 4, 2013 at 1:30 AM, Matthias Petermann <matt...@petermann-it.de
> wrote:
> Hi Ethan,
>
> Zitat von "Ethan W. House" <eho...@csh.rit.edu>:
>
>
> What could be causing my brightness control to not work on my Intel
>> graphics card. The acpi values change but no effect takes place.
>>
>> ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.active=1
>> hw.acpi.video.lcd0.active: 0 -> 0
>>
>> I also have an issue were upon resume by machine reboots. I believe the
>> two
>> might be related but I am not sure.
>>
>> I found a couple of other email chains with similar issues but most of
>> them
>> have been inactive for more then a year.
>>
>
> Which Laptop model do you have? This issue appears a bit familiar to me[1]
> - I have the same on my Thinkpad. As a workaround you could try to change
> the brightness by direct ACPI calls.
>
> Preparation:
>
> * install sysutils/acpi_call
> * kldload acpi_call
>
> Change brightness:
>
> * acpi_call -p '\VBRU' (Brightness Up)
> * acpi_call -p '\VBRD' (Brightness Down)
>
> It might be that these calls are specific to Thinkpads, not sure if they
> work with others. You can try to find out with acpidump[1].
>
> Kind regards,
> Matthias
>
> [2] http://www.freebsd.org/doc/en_**US.ISO8859-1/books/handbook/**
> acpi-debug.html<http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html>
> Matthias Petermann <matt...@petermann-it.de>
> Ihr Partner für anspruchsvolle IT-Lösungen
> www.petermann-it.de - lösungsorientiert, innovativ und erfolgreich
>
> freebsd-...@freebsd.org mailing list
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