Date: Wed, 04 Sep 2013 10:30:44 +0200 From: Matthias Petermann <matthias@petermann-it.de> To: freebsd-questions@freebsd.org Subject: Re: Intel graphics card brightness control issue Message-ID: <20130904103044.Horde.cIfa0FIz0Yk1WO9-khv0NQ1@d2ux.org> In-Reply-To: <CAFRryZiFY0Pxh8oomzPPikn7hZ34F8N6smw-3BCDnDGHvas_Bw@mail.gmail.com> References: <CAFRryZiFY0Pxh8oomzPPikn7hZ34F8N6smw-3BCDnDGHvas_Bw@mail.gmail.com>
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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=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 <matthias@petermann-it.de> Ihr Partner für anspruchsvolle IT-Lösungen www.petermann-it.de - lösungsorientiert, innovativ und erfolgreich
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