I hit this problem in 2022 with a similar chipset on an Asus laptop. (I tried other Linux distributions too, including Fedora and Debian with an X.org, and Ubuntu with both X.org and then Wayland.)
Each time I was able to see the console (Ctrl-Alt-F2), but the graphics did not work.
I was able to resolve this problem (with either distribution) by blacklisting the Radeon driver / module.
It took me quite a long time to figure out. I believe we should contact the radeon driver developers team.
This is how you blacklist the radeon module:
Edit (or create) the file /etc/modprobe.d/blacklist.conf as super user.
Add the line
blacklist radeon
Then run
$ sudo update-initramfs -u
to create a new boot image.
(If a Fedora user comes upon this forum, run
# dracut --regenerate-all --force
)
Then, reboot your computer. Double-check that radeon is blacklisted by running
# lspci -v
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV620/M82 [Mobility Radeon HD 3450/3470] (prog-if 00 [VGA co
Subsystem: ASUSTeK Computer Inc. Device 19e2
....
Kernel driver in use: radeon
Kernel modules: radeon
#lshw -c video
*-display
description: VGA compatible controller
product: RV620/M82 [Mobility Radeon HD 3450/3470]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
....
configuration: ******** driver=radeon latency=0