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

Some additional information on my system with AMD Ryzen 5 8600G w/
Radeon 760M Graphics.

This is a new system originally installed with Ubuntu 23.10 which worked
ok. After upgrading to 24.04 the same thing started happening: blank
screen after boot. Works when booted from 24.04 live USB, but after
installation I could not figure out permanent fix for blank screen. It
does work in safe mode (nomodeset), but of course quite slowly.

When I installed SSH server in safe mode and rebooted back to blank
screen, I could login remotely even though the system looked dead.
Nothing stood out in the logs, looked like the system thought it was
working normally. Magic sysrq also works.

I went back to 23.10 for now, but a couple of week old logs from booting
24.04 are available if they might be useful.

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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 6700 XT GPU, a Navi22 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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