Date: Wed, 14 Mar 2012 19:15:46 -0400 From: Hannes Mehnert <hannes@mehnert.org> To: matt <sendtomatt@gmail.com> Cc: Vrachnis Ilias-Dimitrios <vrachil@gmail.com>, freebsd-current@freebsd.org, Ganael LAPLANCHE <ganael.laplanche@martymac.org> Subject: Re: x220 notes Message-ID: <4F6126A2.7050301@mehnert.org> In-Reply-To: <4F6020C0.60405@gmail.com> References: <4E836C06.9070405@gmail.com> <CAGH67wS1YR6V-DPAGtYN4RfrHSbgCrN=Ey2ngTVe6yBiBO1SZw@mail.gmail.com> <4E8374A7.90105@gmail.com> <CAGH67wT8ReUnDGXdxxOwd7x7CmRP7sDAzyFbSKrwT79tM=nZ5A@mail.gmail.com> <CAN6yY1vqNJhtxE2SVqawWxW6Jo-6M7SHwiL-Xo%2BhH-8_d8BHnQ@mail.gmail.com> <4E9BDF13.4040006@gmail.com> <4F38211D.4070305@mehnert.org> <4F40A2D4.6000000@gmail.com> <CAHi1Jsf%2BGVN6YNH_GcsECKdcDLsMQz9yQP-WNEKU8rC%2B%2B%2Biz_Q@mail.gmail.com> <4F57A8FC.8090106@gmail.com> <20120308092234.M18590@martymac.org> <4F5AC96A.3050600@gmail.com> <CAN6yY1vb7G=DOeqUoREgO8hEtmRhpJznoci5ZoHbae4qP9xQKA@mail.gmail.com> <4F5FE9C1.7010901@gmail.com> <4F6020C0.60405@gmail.com>
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Ciao, On 03/14/2012 00:38, matt wrote: > I have brightness control through raw acpi..."\_BCL" and friends seem to > do nothing. > > Most of the video methods differentiate between \VIGD (which seems to be > a check for integrated graphics vs optimus, but that's still a guess) > If \VIGD is true, brightness commands are sent to the EC, where they > don't seem to do much yet. This is probably where we could enable > something via EC/ibm-acpi? > If \VIGD is false, brightness commands are handled in ACPI, although > coarsely, via \VBRC. > > \VBRC seems to allow control over the backlight, at least, so those of > you with sore eyes or the 3-cell battery may have some success using the > acpi_call port (Danger!) > kldload acpi_call > acpi_call -p '\VBRC' -i n (where n is 0-10) Great news! Works for me. n is actually 0-16 (plus any other value which turns the backlight off (-1 or 17 eg). Thanks, Hannes
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