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user343272 avatar Ubuntu

Loading unclaimed graphic card in Ubuntu 21.10 on iMac 2011

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user343272

On an iMac 21'' Mid 2011 my AMD GPU seems to have gone bad and not able to boot macOS, I am now booted into an Ubuntu 21.10 usb with persistent filesystem and can see both the cards in terminal. The question is how to load the Intel card instead of current llvm used by Ubuntu, I have tried the GRUB modeset options for both AMD and Intel but they do not work and result in black screen, probably because of how macOS handle hardware access.

sudo lshw -c video
  *-display UNCLAIMED       
       description: VGA compatible controller
       product: Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:01:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list
       configuration: latency=0
       resources: memory:90000000-9fffffff memory:a8800000-a881ffff ioport:2000(size=256) memory:a8820000-a883ffff
  *-display UNCLAIMED
       description: Display controller
       product: 2nd Generation Core Processor Family Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm bus_master cap_list
       configuration: latency=0
       resources: memory:a8000000-a83fffff memory:a0000000-a7ffffff ioport:3000(size=64)
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