dmidecode -s system-product-name
HP Pavilion dv7 Notebook PC

dmidecode -s system-version
048E100000242B10000020000

lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA
01:05.0 VGA compatible controller [0300]: ATI Technologies Inc M880G [Mobility 
Radeon HD 4200] [1002:9712] (prog-if 00 [VGA controller])
02:00.0 VGA compatible controller [0300]: ATI Technologies Inc Manhattan 
[Mobility Radeon HD 5000 Series] [1002:68e0] (prog-if 00 [VGA controller])

~/acpi_call$ ./test_off.sh
Trying \_SB.PCI0.P0P1.VGA._OFF: failed
Trying \_SB_.PCI0.OVGA.ATPX: failed
Trying \_SB_.PCI0.OVGA.XTPX: failed
Trying \_SB.PCI0.P0P2.PEGP._OFF: failed
Trying \_SB.PCI0.MXR0.MXM0._OFF: failed
Trying \_SB.PCI0.PEG1.GFX0._OFF: failed
Trying \_SB.PCI0.PEG1.GFX0.DOFF: failed
Trying \_SB.PCI0.XVR0.Z01I.DGOF: failed
Trying \_SB.PCI0.PEGR.GFX0._OFF: failed
Trying \_SB.PCI0.PEG.VID._OFF: failed
Trying \_SB.PCI0.P0P2.DGPU._OFF: failed


** Attachment added: "DSDT.dsl"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/312756/+attachment/1569876/+files/DSDT.dsl

-- 
support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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