this post was submitted on 29 Jul 2025
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Have any other distros been tried on this box and do the same issues present with them? I think the recommended PSU combined with an RX580 is 600W, so you might try swapping PSUs. Another option if you don't have a spare to test with is to undervolt the GPU. If it stabilizes at that point, it would suggest the PSU needs replacement. At least that way you wouldn't be dropping money on a hunch.
Another good indicator of that being GPU/PSU issues is the fact you mention not being able to get past the login screen. Both X11 and Wayland (especially Wayland) crank up the VRAM usage at that point due to compositors caching and whatnot
I've been running with an RX 580 on my desktop with Debian Testing for three years, and I've had no problems like this.
I'm running with a 750W power supply, so I'm inclined to agree that the the OP should pop open their PC case and check their wattage. Assuming this is an ATX box, it's probably just a matter of removing two screws and sliding off the side of the case and reading the wattage. If it's a reasonable wattage and it's still giving issues, then try the aforementioned undervolting.
So, running furmark gets me the pink squares and crash after about 3 minutes. Gets 60 fps the whole time and sits around 70C. I am thinking psu seems likely.