Fixing X220 Video The Right Way (and trying to apply the same fix to X121e)

[Matthias Petermann]

Am 09.07.2013 17:56, schrieb John Baldwin:
> 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.
>
Hi John,

thanks for this hint. After "kldload acpi_video" devinfo -v shows the 
following (truncated):

nexus0
   acpi0
       pcib0 pnpinfo _HID=PNP0A08 _UID=0 at handle=\_SB_.PCI0
           pci0
             hostb0 pnpinfo vendor=0x8086 device=0x0104 subvendor=0x17aa 
subdevice=0x21ed class=0x060000 at slot=0 function=0
             vgapci0 pnpinfo vendor=0x8086 device=0x0116 
subvendor=0x17aa subdevice=0x21ed class=0x030000 at slot=2 function=0 
handle=\_SB_.PCI0.GFX0
               agp0
               drm0
               drmn0
               acpi_video0

Assuming the patch cannot help me, do you have an idea what I could 
check next?
I can control the brightness with
     acpi_call -p '\VBRU'
     acpi_call -p '\VBRD'

https://d2ux.org/owncloud/public.php?service=files&t=7022f90cea5e48da7fa65806c0d66091

Regards,
Matthias