this post was submitted on 16 Feb 2025
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Something is definitely off on your system. I've a 7900 XTX (the slightly-higher-end version of that card), and while I don't have the box in front of me, it definitely runs at at least reasonable (60fps+) rates at 2560x1440 on KSP. Might do well above that, dunno. It's definitely not herky-jerky to the level you're seeing, though.
Are you using Wayland or Xorg?
If you run
radeontop(in Debian trixie, package radeontop) it should tell you various load characteristics. There isn't a GPU-agnostic utility to do this, unless things have changed since last I've looked -- Nvidia and AMD both have their own utilities.Unless you're aiming for AI stuff, where there are some significant benefits, like a large userbase and support for transformers, I'd probably recommend AMD for Linux use.
EDIT:
If you run
glxinfoon either Xorg (or Wayland, since the emulation layer will handle it), package mesa-utils on Debian trixie, it'll tell you what OpenGL is trying to use. If you're using hardware-accelerated stuff, you'll get something like this:That's been the quick-thumb-in-the-wind test to know whether hardware 3d acceleration is running since just about forever. KSP probably doesn't actually use OpenGL -- I'd guess that it's probably using DirectX going through some emulation layer in Proton to Vulkan -- but if you've got something wonky like no usable 3D driver support for your GPU, that'll show it up.
EDIT2: There's also
vulkaninfoin (package vulkan-tools in Debian trixie). It'll give you something like:EDIT3: If you're using Xorg and that doesn't show hardware acceleration in use, then the next thing that I'd probably look at is
/var/log/Xorg.0.logto see what Xorg is saying regarding your GPU. I don't know much about diagnosing Wayland issues, as I've not been using it for all that long. The kernel log may also have interesting messages information (as root,journalctl -kbordmesg) if the problem is at the kernel level.glxinfo | grep Vendor
Vendor: Mesa (0xffffffff)glxinfo | grep Device
Device: llvmpipe (LLVM 17.0.6, 256 bits) (0xffffffff)glxinfo | grep "OpenGL rend"
OpenGL renderer string: llvmpipe (LLVM 17.0.6, 256 bits)Let me know if that's not right. glxinfo dumps a lot of text but those are the only hits for your comment.
When I launch radeontop it prints this before launching, and then the output suggests it isn't working:
Unknown Radeon card. <= R500 won't work, new cards might.
All stats sit at 0.00% except for Memory Clock @ 9%.
EDIT:
xorg, not wayland
Yeah, so it's not using hardware acceleration then -- your (poor) CPU has been trying to do all this in software emulation. I updated my comment above -- take a look in Xorg.0.log if you're on Xorg. My first guess is that you most-likely need newer drivers.
I know that these are new enough for the 7900 XTX; that's current for Debian trixie, just to provide a known-good point in terms of driver version.
EDIT: You don't say what distro you're using. If you're using Debian stable -- I think I was when I first got my 7900 XTX, and IIRC they didn't have driver support in at that point, though that was a while back now -- you might check whether you have the backports repository present.
EDIT2: The first results for my search as to minimum supported version, though I wouldn't take this as authoritative:
https://old.reddit.com/r/debian/comments/1301rph/radeon_7900_support/
EDIT3: Sorry, you did say which OS you were using -- PopOS.
dpkg -l|grep radeon
I don't know exactly what i'm looking for in the xorg logs... cat /var/log/Xorg.*.log | grep "EE"
cat /var/log/Xorg.*.log | grep "WW"
cat /var/log/Xorg.*.log | grep "gpu"
sudo journalctl -kb | grep gpu