Date: Wed, 04 Sep 2013 09:14:35 -0700 From: "Ethan W. House" <ehouse@csh.rit.edu> To: Matthias Petermann <matthias@petermann-it.de> Cc: freebsd-questions@freebsd.org Subject: Re: Intel graphics card brightness control issue Message-ID: <CAFRryZhoE1prB%2Btzfu6LkBzkHwfC7Tsw5wkJw456EoT%2B3kP4Xw@mail.gmail.com> In-Reply-To: <20130904103044.Horde.cIfa0FIz0Yk1WO9-khv0NQ1@d2ux.org> References: <CAFRryZiFY0Pxh8oomzPPikn7hZ34F8N6smw-3BCDnDGHvas_Bw@mail.gmail.com> <20130904103044.Horde.cIfa0FIz0Yk1WO9-khv0NQ1@d2ux.org>
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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 <matthias@petermann-it.d= e > wrote: > Hi Ethan, > > Zitat von "Ethan W. House" <ehouse@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=3D**50 >> hw.acpi.video.lcd0.brightness: 100 -> 50 >> ehouse@derpy ~ $ sudo sysctl hw.acpi.video.lcd0.active=3D1 >> 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=3Damd64/181357<http://ww= w.freebsd.org/cgi/query-pr.cgi?pr=3Damd64/181357> > [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 <matthias@petermann-it.de> > Ihr Partner f=FCr anspruchsvolle IT-L=F6sungen > www.petermann-it.de - l=F6sungsorientiert, innovativ und erfolgreich > > ______________________________**_________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-**questions<http://li= sts.freebsd.org/mailman/listinfo/freebsd-questions> > To unsubscribe, send any mail to "freebsd-questions-** > unsubscribe@freebsd.org <freebsd-questions-unsubscribe@freebsd.org>"
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