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My GPU (RX 5600 XT) does not appear as an option in this menu: It reads: No compatible GPUs found for Cycles. Requires AMD GPU with Vega or RDNA architecture and AMD driver version 22.10 or newer

My card does meet those requirements and I have Radeon™ Software for Linux® installer version 22.20 for Ubuntu 20.04.5 HWE installed. I have a similar issue with DaVinci Resolve.

The interesting thing is that when I run blender as root, Both my GPU and CPU appear as options.

Here is some information I get from lspci -vnn

    Subsystem: XFX Pine Group Inc. Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT] [1682:5710]
    Flags: bus master, fast devsel, latency 0, IRQ 77
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at e0000000 (64-bit, prefetchable) [size=2M]
    I/O ports at f000 [size=256]
    Memory at fcd00000 (32-bit, non-prefetchable) [size=512K]
    Expansion ROM at fcd80000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: amdgpu
    Kernel modules: amdgpu```
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I fixed my issue. After doing all of the things above, what finally worked was logging out, then restarting my device.

It probably also helped that I ran this beforehand: sudo usermod -a -G video username sudo usermod -a -G render username

Putting my user in the render/video group(s) seemed to give my access to GPU.

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