Note: I actually compiled all this info and wrote up a post but I ended up solving it at the last minute!!! Here is my info and the solution is below in case anyone needs it. Also if anyone knows why the heck this happened that would be so cool to know.
Bit of a noobie here, when I log into fedora 40, I get a blank screen. Can anyone please give me a hand? I can get into tty and just ran sudo dnf update fine. I use kde plasma, have a 6800xt, 3 monitors and one of them is 4k. Here are (or what I think are) the most important things to note:
When looking at journalctl -b -xe | grep -i err I see this block repeated 18 times
Jul 17 17:10:10 fedora xdg-desktop-portal-kde[6784]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD128 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:10 fedora xdg-desktop-portal-kde[6784]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD129 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:11 fedora org_kde_powerdevil[6775]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD128 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:11 fedora org_kde_powerdevil[6775]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD129 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:11 fedora polkit-kde-authentication-agent-1[6774]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD128 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:11 fedora polkit-kde-authentication-agent-1[6774]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD129 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:18 fedora plasmashell[6794]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD128 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:18 fedora plasmashell[6794]: TU: error: ../src/freedreno/vulkan/tu_knl.cc:227: failed to open device /dev/dri/renderD129 (VK_ERROR_INCOMPATIBLE_DRIVER)
Jul 17 17:10:34 fedora xdg-desktop-por[6777]: Failed to create settings proxy: Error calling StartServiceByName for org.freedesktop.impl.portal.desktop.kde: Timeout was reached
When running sudo dmesg | grep -iE 'amd|gpu', I noticed smu driver version didn’t matched
[ 8.673321] amdgpu 0000:03:00.0: amdgpu: smu driver if version = 0x00000040, smu fw if version = 0x00000041, smu fw program = 0, version = 0x003a5a00 (58.90.0)
[ 8.673323] amdgpu 0000:03:00.0: amdgpu: SMU driver if version not matched
[ 8.673351] amdgpu 0000:03:00.0: amdgpu: use vbios provided pptable
[ 8.751038] amdgpu 0000:03:00.0: amdgpu: SMU is initialized successfully!
More info
sudo dnf list installed | grep -iE 'amd'
amd-gpu-firmware.noarch 20240709-1.fc40 @updates
amd-ucode-firmware.noarch 20240709-1.fc40 @updates
teamd.x86_64 1.32-7.fc40 @updates
lsmod | grep -iE amdgpu|gpu
amdgpu 17833984 10
amdxcp 12288 1 amdgpu
i2c_algo_bit 20480 1 amdgpu
drm_ttm_helper 12288 1 amdgpu
ttm 114688 2 amdgpu,drm_ttm_helper
drm_exec 12288 1 amdgpu
gpu_sched 65536 1 amdgpu
drm_suballoc_helper 12288 1 amdgpu
drm_buddy 20480 1 amdgpu
drm_display_helper 274432 1 amdgpu
video 81920 1 amdgpu
Solution
I checked the permissions to that file using ls -l /dev/dri/renderD*
crw-rw----. 1 root vglusers 226, 128 Jul 17 17:36 /dev/dri/renderD128
crw-rw----. 1 root vglusers 226, 129 Jul 17 17:36 /dev/dri/renderD129
Checked my user permissions using groups $USER
myname : myname wheel
Added vglusers using sudo usermod -aG vglusers $USER
Checked my user permissions using groups $USER
myname : myname wheel vglusers
reboot that sucker, and cross your fingers
and Thanks for the contribution !