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The solution is to launch Steam with your dGPU, but currently that causes a crash due to this bug. [github.com]
As a workaround launch Steam from a terminal like this, so it can see your dGPU without crashing:
DRI_PRIME=1 steam -cef-disable-gpu
Then you can copy your system information and it will show your dGPU.
Without the -cef-disable-gpu option what happens is that Steam's browser engine (Chromium Embedded Framework) will try to use the dGPU and crash.
Another alternative is going into Steam settings and disabling "Enable GPU accelerated rendering in web views," which does the same as the -cef-disable-gpu option. Then you can launch Steam using your dGPU.
It says
RAM: %$s1 MB
OS: Debian GNU/Linux 12 (bookworm)
KERNEL: 6.1.0-18-amd64
CPU: Intel Core i7-10870H @ 2.20GHz
GPU: Mesa/X.org llvmpipe (LLVM 15.0.6, 256 bits)
GPU DRIVER: 4.5 Mesa 22.3.6
RAM: 32 GB
Should be:
Driver Version: 550.54.14
NVIDIA GeForce RTX 2060