I get a "Unknown object type '0'" error. Which interestingly enough is very 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 <matth...@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.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<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<http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html> > -- > Matthias Petermann <matth...@petermann-it.de> > Ihr Partner für anspruchsvolle IT-Lösungen > www.petermann-it.de - lösungsorientiert, innovativ und erfolgreich > > ______________________________**_________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-**questions<http://lists.freebsd.org/mailman/listinfo/freebsd-questions> > To unsubscribe, send any mail to "freebsd-questions-** > unsubscr...@freebsd.org <freebsd-questions-unsubscr...@freebsd.org>" _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"