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Date: Mon, 08 Jul 2013 13:55:30 +0200
Message-ID: <20130708135530.Horde.FnPwsSps0y86gQYFaIK_tw2@d2ux.org>
From: Matthias Petermann <matthias@d2ux.net>
To: freebsd-current@freebsd.org
Subject: Re: Fixing X220 Video The Right Way (and trying to apply the same
 fix to X121e)
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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
                   {
            [truncated]

Unfortunately I'm far away from understanding the ASL, so I can only  
guess this is the part where my graphics device is described. Also,  
because I don't have a PEG device with DOD / DOS, I fear the described  
patch for the X220 will not solve the problem for me?

My ASL is located here:  
https://d2ux.org/owncloud/public.php?service=files&t=7022f90cea5e48da7fa65806c0d66091

I would really appreciate if someone with more ACPI background could  
take a look at it and
tell me what I should try next.

Thanks & kind regards,
Matthias