Date: Tue, 15 May 2012 16:10:15 +0300 From: Ievgen Krapyva <ykrapiva@gmail.com> To: Lawrence Stewart <lstewart@freebsd.org> Cc: freebsd-desktop@freebsd.org Subject: Re: How is monitor brightness is controlled ? Message-ID: <201205151610.15817.ykrapiva@gmail.com> In-Reply-To: <4FB223BD.3070208@freebsd.org> References: <CADGKei7u5EOEZd2vsMTKK14Fnmyo2N2xfGfo2ZMu_2yC6fgbRQ@mail.gmail.com> <4FB223BD.3070208@freebsd.org>
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Thank you, Stewart, I've already got some knowledge and looked throught the variables, there is nothing similar in there. devel-pc# sysctl -a | grep lcd devel-pc# sysctl -a | grep brightness I've also tried loading acpi_video.ko, that also does not work. In fact none of the Fn+ combintations work on my laptop, except of Fn+F2 (turns on/off Wireless devices). I feel it's not under control of FreeBSD rather BIOS is doing it (correct me if I'm wrong). Pressing this combination just turns off Wi-Fi on a hardware level, in FreeBSD I can see the effect by examining the contents of dmesg: wlan0: link state changed to DOWN I assume I should move in the direction of ACPI, right ? Best regards, Ievgen On Tuesday 15 May 2012 12:37:01 you wrote: > On 05/13/12 17:55, Yevgen Krapiva wrote: > > Hi everyone. > > > > Could somebody tell me what thing in FreeBSD is managing the monitor > > brightess ? > > Given that the function keys don't work, check if you have any relevant > sysctl options to play with. Most likely to find them under hw.acpi, but > try grepping "sysctl -a" output for bright or lcd to see if anything > comes up. > > > I've got Dell Inspiron laptop, FreeBSD 9.0 RELEASE and KDE4. > > Pressing the functional combintation of Fn+F4/F5 does not have any > > effect. In order to understand what's wrong I need to know in what > > direction I should move. > > Getting the fn keys working requires some ACPI voodoo I'm not familiar > with, so I'll have to defer to someone else to advise on that. The info > at [1] might be a good starting point. The fn keys on my Toshiba R600 > laptop started working only after I loaded the acpi_toshiba.ko kernel > module. I note there's no similar module for Dell's so getting them > working will probably require some fiddling. > > Cheers, > Lawrence > > [1] > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-debug.html
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