Comment # 21 on bug 108992 from Zheng Luo

With iommu=soft I still occasionally experience frozen screen with following
logs:

Jan 02 16:11:18 lzThinkpad gnome-shell[1647]: Failed to flip: Cannot allocate
memory
Jan 02 16:11:18 lzThinkpad kernel: amdgpu 0000:05:00.0: 00000000a2e0b642 pin
failed
Jan 02 16:11:18 lzThinkpad kernel: [drm:dm_plane_helper_prepare_fb [amdgpu]]
*ERROR* Failed to pin framebuffer with error -12