I can confirm after this upgrade:
linux-firmware:amd64 (20240318.git3b128b60-0ubuntu2.27,
20240318.git3b128b60-0ubuntu2.29)
my system boots into right half with stripes or black screen. The UI is
slow and often several seconds with black screen. SSH seems to be fine.
Downgrade: linux-firmware:amd64 (20240318.git3b128b60-0ubuntu2.29,
20240318.git3b128b60-0ubuntu2.26)
make it useable again.
@Roger (hrothgar): as a workaround you could boot into nomodeset.
Without loading the AMDGPU the system also seems to work, but beware
only VESA there.
My GPU is:
0a:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi
21 [Radeon RX 6800/6800 XT / 6900 XT] (rev c0) (prog-if 00 [VGA controller])
Subsystem: XFX Limited Speedster MERC 319 AMD Radeon RX 6900 XT Black
Flags: bus master, fast devsel, latency 0, IRQ 85, IOMMU group 18
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at e0000000 (64-bit, prefetchable) [size=2M]
I/O ports at d000 [size=256]
Memory at fc900000 (32-bit, non-prefetchable) [size=1M]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
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https://bugs.launchpad.net/bugs/2163303
Title:
[regression] linux-firmware 20240318.git3b128b60-0ubuntu2.29 causes
half-screen corruption/black screens on AMD Navi 21; 0ubuntu2.26 works
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