From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Steinert Subject: Re: lcd backlight Date: Sat, 12 Jul 2003 23:11:09 -0500 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <3F10DBDD.20607@kuiki.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org I'm in a jam, I've got an Nvidia Geforce 4 440 Go, and /every/ time I see a backlight control it is for a radeon. Does anyone have one for nvidia chipsets? or does anyone have hints on how to build one? I'm not much of a C programmer, but I might be able to fiddle my way though it. Now, the reasoning why I posted this to the ACPI list? Because when I enable ACPI (with a patched DSDT) on my Dell Inspiron 8200, and create any events (S1, close lid, etc.) the display is off (both the LCD and the backlight turn off) until I reboot. If you have any hints on how to fix this instead, that would be much appreciated. Thanks much, Jonathan Steinert James H. Cloos Jr. wrote: >A bios setting causes a regular screen blank, but w/ acpi the lcd's >backlight is left on. > >The following function (based on 's radeontools) controls the >backlight perfectly: > >void radeon_cmd_light(int param) >{ > unsigned long dac_cntl; > > dac_cntl = radeon_get(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL"); > if(param != 0) { > dac_cntl |= RADEON_LVDS_ON; > } else { > dac_cntl &= ~ RADEON_LVDS_ON; > } > radeon_set(RADEON_LVDS_GEN_CNTL,"RADEON_LVDS_GEN_CNTL",dac_cntl); >} > > >What needs to be done, given this info on how to control the >backlight and the bios's dsdt, to convince the kernel to toggle >the backlight when the screen blanks? > >-JimC > > > >------------------------------------------------------- >This SF.Net email sponsored by: Parasoft >Error proof Web apps, automate testing & more. >Download & eval WebKing and get a free book. >www.parasoft.com/bulletproofapps1 >_______________________________________________ >Acpi-devel mailing list >Acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org >https://lists.sourceforge.net/lists/listinfo/acpi-devel > > > ------------------------------------------------------- This SF.Net email sponsored by: Parasoft Error proof Web apps, automate testing & more. Download & eval WebKing and get a free book. www.parasoft.com/bulletproofapps1