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Ubuntu - GPU - Drivers - Get the currently used graphics driver

sudo lshw -c video

returns:

  *-display                 
       description: VGA compatible controller
       product: Navi 31 [Radeon RX 7900 XT/7900 XTX]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:0c:00.0
       logical name: /dev/fb0
       version: c8
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom fb
       configuration: depth=32 driver=amdgpu latency=0 mode=3440x1440 resolution=3440,1440 visual=truecolor xres=3440 yres=1440
       resources: iomemory:f00-eff iomemory:f80-f7f irq:129 memory:f000000000-f7ffffffff memory:f800000000-f80fffffff ioport:e000(size=256) memory:fcb00000-fcbfffff memory:fcc00000-fcc1ffff

NOTE: This shows that the Graphics Driver is amdgpu.

It also shows an AMD Radeon RX 7900 XT/7900 XTX GPU is being used.