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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: Re: Fixing X220 Video The Right Way (and trying to apply the same fix
 to X121e)
Date: Tue, 9 Jul 2013 11:56:43 -0400
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Cc: Matthias Petermann <matthias@d2ux.net>
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On Monday, July 08, 2013 4:41:28 am Matthias Petermann wrote:
> 
> Hello,
> 
> I applied the patch, trying to get brightness controls for my X121e.
> 
> But it looks like I need a different loader.conf setting.
> 
>      hw.pci0.0.2.0.handle="\\\\_SB_.PCI0.PEG.VID"
> 
> doesn't work. In my ASl there is only one device providing DOD / DOS:
> 
> Scope (_SB.PCI0)
>       {
>       Device (GFX0)
>           {
>               Name (_ADR, 0x00020000)  // _ADR: Address
>               Method (_DOS, 1, NotSerialized)  // _DOS: Disable Output  
> Switching
>               {
>                   Store (And (Arg0, 0x07), DSEN)
>                   If (LEqual (And (Arg0, 0x03), Zero))
>                   {
>                       If (CondRefOf (HDOS))
>                       {
>                           HDOS ()
>                       }
>                   }
>               }
> 
>               Method (_DOD, 0, NotSerialized)  // _DOD: Display Output 
Devices
>               {
>                   If (CondRefOf (IDAB))
>                   {
>                       IDAB ()
>                   }
>                   Else
>                   {

So this is the \_SB_.PCI0.GFX0 device.  However, you should kldload acpi_video
and see if it already attaches to this device (devinfo -v can be helpful here 
as it will show the ACPI handle of the parent of the acpi_video device).  If 
it does, then this patch can't help you.

-- 
John Baldwin