I am trying to install an AMD Radeon™ RX 6600 XT GPU in Ubuntu 22.04.2 LTS. I went through the amdgpu install process, however only one monitor (connected to motherboard) is detected. The monitor connected to GPU isn't detected. The screen is displaying on startup, then disappears when it reaches the Ubuntu login page and is no longer detected. I am fairly new to linux, can anyone suggest how to proceed?
Outputs
$ lspci -k | grep -EA3 'VGA|3D|Display'
03:00.0 VGA compatible controller: ASPEED Technology, Inc. ASPEED Graphics Family (rev 52) DeviceName: ASPEED Video AST2600 Subsystem: Super Micro Computer Inc ASPEED Graphics Family Kernel driver in use: ast
43:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 23 [Radeon RX 6600/6600 XT/6600M] (rev c1) Subsystem: ASRock Incorporation Navi 23 [Radeon RX 6600/6600 XT/6600M] Kernel driver in use: amdgpu Kernel modules: amdgpu
$ xrandr --listmonitors
Monitors: 1 0: +*VGA-1 1920/531x1080/299+0+0 VGA-1
Screenshot showing Graphics as llvmpipe in Settings -> About: https://i.stack.imgur.com/epp9T.png
