I have a similar problem with Xubuntu and kernel version linux-image-6.5.0-9-generic. Adding "amdgpu.dcdebugmask=0x10" to /etc/default/grub fixes the flickering screen.
OS: Xubuntu 23.10 x86_64
21F8003HMX ThinkPad T14s Gen 4
CPU: AMD Ryzen 7 PRO 7840U w/ Radeon
I have a similar problem with Xubuntu and kernel version linux-image- 6.5.0-9- generic. Adding "amdgpu. dcdebugmask= 0x10" to /etc/default/grub fixes the flickering screen.
OS: Xubuntu 23.10 x86_64
21F8003HMX ThinkPad T14s Gen 4
CPU: AMD Ryzen 7 PRO 7840U w/ Radeon