AMD Radeon RX 6400 On Linux

The Radeon RX 6400 has been running fine the past week on Linux with Ubuntu 21.10 and 22.04 LTS. Most of my testing has been on Ubuntu 22.04 LTS with its Linux 5.15 kernel and newer and Mesa both stock and with the Oibaf PPA.

Both the DisplayPort and HDMI outputs are working fine and the RX 6400 GPU is capable enough for handling desktop compositing and other standard desktop tasks with ease.

While the RX 6400 isn't all that interesting for performance benchmarking, I did run a few tests of the Radeon RX 6400 up against the Radeon RX 5500 XT and RX 6500 XT graphics cards as well as the Ryzen 7 5700G integrated graphics with all the benchmarking being done with that APU system. For fun I even tossed in an old Radeon HD 5450 -- just as that GPU has been quite common for low-profile PCIe graphics cards and has been for sale for quite some time. Even just a year or two back I picked up another one new for use in a 2U server and have several of them around for use in different 2U systems when just needing display support within a low-profile box.

The RX 5500 XT / RX 6500 XT were obviously faster than this low-profile RX 6400 for Vulkan compute purposes, but the RX 6400 was at least doing better than the Ryzen 7 5700G integrated Radeon graphics.

With some old, open-source games the Radeon RX 6400 can run titles like ET: Legacy, Tesseract, and Unvanquished but don't expect to be running any modern AAA games on the RX 6400 at a modest resolution. With this low-end comparison it did show some potential Linux driver shortcomings with the number of areas where the Radeon RX 6500 XT was slower than the prior-gen RX 5500 XT.