two AMD cards failing with radeon driver

[Krister Swenson]

Hello all,

I couldn't find a list to send mail to concerning the radeon driver. Is
this an OK place?

I'm desperate for help, as I have crippling issues with my AMD cards since
updating to Ubuntu 24.04. This is my work machine, and it's seriously
hampering my productivity.

I have a bit of experience messing around with this stuff over the last
decades, but remain very naive about debugging graphics problems. I have
two cards:

03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Oland GL [FirePro W2100]
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM]

Since the update the Radeon HD no longer works: I can boot into safe mode,
but any attempt to start GDM results in a black screen with a line at the
bottom.

The FirePro card appears to work fine, until the driver goes haywire and I
see a screen full of snow. I can still <ctrl><alt><F4> to a terminal and
shut the machine down (without seeing anything but snow), but the graphics
will not work. This happens with Wayland and Xorg. I posted a bug report
here that includes details from syslog:

https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/2068342

I would greatly appreciate any advice, hints, or workarounds on this issue,
as it's seriously holding me back. Thank you folks!

kms

p.s.

A few more details follow...

=> sudo lshw -c video
  *-display
       description: VGA compatible controller
       product: Oland GL [FirePro W2100]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci at 0000:03:00.0
       logical name: /dev/fb0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list
rom fb
       configuration: depth=32 driver=radeon latency=0 resolution=2560,1080
       resources: irq:50 memory:e0000000-efffffff memory:f3e00000-f3e3ffff
ioport:8000(size=256) memory:f3e40000-f3e5ffff
  *-display
       description: VGA compatible controller
       product: Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci at 0000:04:00.0
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list
rom
       configuration: driver=radeon latency=0
       resources: irq:51 memory:d0000000-dfffffff memory:f3d20000-f3d3ffff
ioport:7000(size=256) memory:f3d00000-f3d1ffff
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