Ah, okay. Thanks for taking the time, I'm curious to hear about your findings.
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Edit: hmm but it just occurred to me, the AMDRadeonX3000.kext was loaded in recovery mode.
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kext AMD 1.5.1 in folder /DisableExtensions - your video card AMD device id: 6740 - vendor: 1002
cd /DisableExtensions
cat AMDRadeonX3000.kext/Contents/Info.plist | grep 6740
<string>0x67501002 0x67581002 0x67591002 0x67401002 0x67411002 0x67451002</string>
AMDRadeonX3000.kext is for your AMD video card. Device ID of the AMD video card confirmed.
Update:
The strange thing is that AppleGraphicsPowerManagement.kext only reported something with device id 6740 on Imac 12.2.
cat /System/Library/Extensions/AppleGraphicsPowerManagement.kext/Contents/Info.plist
<key>iMac12,2</key>
<key>Vendor1002Device6740</key>
<dict>
<key>control-id</key>
<integer>17</integer>
<key>max-power-state</key>
<integer>2</integer>
</dict>
<key>MacBookPro8,3</key>
<dict>
<key>GFX0</key>
<dict>
<key>QSC</key>
<dict>
<key>Enabled</key>
<integer>1</integer>
<key>Mode</key>
<integer>1</integer>
<key>hwPState</key>
<array>
<integer>0</integer>
<integer>0</integer>
<integer>1</integer>
<integer>1</integer>
<integer>1</integer>
<integer>1</integer>
<integer>1</integer>
<integer>1</integer>
<integer>2</integer>
</array>
<key>qscOnTime</key>
<array>
<integer>0</integer>
<integer>1440</integer>
<integer>0</integer>
<integer>2400</integer>
<integer>4000</integer>
<integer>5760</integer>
<integer>7680</integer>
<integer>9760</integer>
<integer>0</integer>
</array>
</dict>
<key>control-id</key>
<integer>17</integer>
<key>max-power-state</key>
<integer>8</integer>
</dict>
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