There are two GPU(RTX 6000 ada, GeForce GT 730), Can't log in Ubuntu 20.04

I have two nvidia gpu cards. one is RTX 6000 ada, the other is GeForce GT 730. here is the device information.
lspci |grep VGA
17:00.0 VGA compatible controller: NVIDIA Corporation Device 26b1 (rev a1)
65:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce GT 730] (rev a1)

after I did “sudo apt install nvidia-driver-470 -y”, I can login the system. but nvidia-smi can’t see RTX 6000 ada. so I did “sudo apt-get remove nvidia* -y && sudo apt install nvidia-driver-535 -y”. now I can see the RTX 6000 ada by nvidia-smi. but I can’t login the system. here is the log nvidia-bug-report.log.gz (443.2 KB). please help, Thanks!

You can’t really mix a legacy-gen nvidia gpu with a current-gen one in a sensible way. With the current driver, the Xserver is now running on the RTX 6000 Ada. Just connect your monitor to it and remove the GT730.

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