External monitor freezing

Hello, I have had the exact same issue with my laptop where the display freezes, except for the cursor can be moved but nothing can be interacted with. I was also on Ubuntu 25.04 with the Ryzen AI 300 processor.

I could find nothing in the logs to help identify the issue, and thought maybe it was an issue with Ubuntu, so tried Fedora 42 (which is a recommended OS on the Framework website). This changed nothing, but I have noticed a few others have had similar issues in the forums.

I have followed the suggestion in this thread to add the line amdgpu.dcdebugmask=0x10 in the file /etc/default/grub using the nano editor in terminal (requires admin permissions). This is added onto the line to become:

GRUB_CMDLINE_LINUX=“rhgb quiet amdgpu.dcdebugmask=0x10” which is line 6 of this file.

Once saved you will also need to reconfigure grub using the terminal:

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

Then reboot your laptop

Since doing this yesterday I have had success in the limited time I have since used my laptop, with no freezing of the screen.

I will update if this proves to have not worked, but hope this helps!