[Bug 2063983] Re: 24.04 Upgrade/Fresh Install results in black screen on reboot on AMDGPU system

I had the same issue while trying to upgrade to Kubuntu 24.04 or install
Kubuntu 24.04 from scratch. I get a black screen at startup.

My graphic card is also an AMD GPU : Radeon RX 7800 XT.

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https://bugs.launchpad.net/bugs/2063983

Title:
24.04 Upgrade/Fresh Install results in black screen on reboot on
AMDGPU system

Status in linux package in Ubuntu:
Confirmed

Bug description:
Config: Ryzen 5 5600X with Radeon 6800 XT GPU, a Navi21 card.

Using xUbuntu.

I had been daily driving the 24.04 nightly iso since March. About a
week ago, I took a kernel update via apt and rebooted. The result was
that the system would hard freeze to a black screen after the initial
kernel messages cleared from the screen. Ctrl-Alt-Del did nothing,
switching terminals (ctrl-alt-f#) did nothing, had to hard power off
to regain control of the system.

I tried various fixes, none of which permanently stuck. This includes
nomodeset in grub, rebooting into safe mode, checking for proprietary
drivers. Safe mode allowed me to reboot once more into desktop, but
then any subsequent reboots would result in a black screen lockup.

Suspending while able to use the desktop before reboot would cause a
black screen lockup did not seem to cause any issues.

3 days before 24.04 was officially released, I reflashed the most
recent installer iso to my thumbdrive, copied my home folder to my
RAID and did a full wipe and fresh install.

First reboot after installation always went to the desktop. Subsequent
reboots always resulted in a black screen lockup.

Memtest cleared without errors.

Again tried various fixes, nomodeset, safe mode, drivers. The only
consistency was that regardless of what I could do to regain control
or what I did differently when doing a wipe and reinstall, I would
always reboot to a black screen.

Once 24.04 was officially released, I again did a full wipe and
reinstall and encountered all of the above same issues as before.

After mentioning this in #ubuntu on libera, someone suggested a kernel
downgrade.

24.04 as installed was using 6.8.0-31.31

Using Mainline, I downgraded to the next minor version below 6.8 that
was considered stable. 6.7.10

Problem went away. No more black screen on boot, no more hard power
offs required to be able to use my system again, no suspend issues.
Was not necessary for me to do anything else to maintain a consistent
successful reboot to desktop.

Did yet another full wipe and fresh install of 24.04, only installing
Mainline upon first reboot to install 6.7.10, using Grub Customizer to
edit the default grub option to boot the 6.7.10 kernel instead.

No issues.

I apologise that I did not collect logs during this process.

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