I recently bought an Asus TUF FX705DY laptop with a Ryzen 5 3550H CPU and AMD RX560X GPU, I wanted to try an all AMD laptop as my previous Intel+Nvidia laptop had given me nothing but trouble on Linux.
Installation was mostly trouble-free (I had to use a Manjaro Testing live image as this cpu apparently needs kernel 5.0 or higher) but I'm noticing a strange phenomenon: The laptop runs fine after booting, all applications run smoothly, but if I run a graphics heavy app (e.g. Blender, Steam games) the whole laptop seems to grind to a halt.
Specific example: I do some video editing in Lightworks, no stuttering, cpu load during playback ~15%. Then, play a game on Steam - starts off at a satisfactory framerate of 40-45 fps, then after a few seconds slows down to 10-15 fps. Close game, exit Steam, run Lightworks again. Playback is now stuttering and cpu load is ~80-85% for the same task as before. Other applications seem to be struggling as well. Only fix is a reboot.
I'm by no means a Linux expert and don't know where to start troubleshooting. Can anyone offer some advice?
My inxi -Fxzc0 output is as follows:
Thanks for any tips