[Solved] No GUI after motherboard/cpu change

[igorfk]

After I swapped a motherboard/cpu from Intel to AMD I cannot login graphically anymore in the Debian partition of a dualboot system.

I can boot in the Windows partition fine, but in the Debian partition only in the recovery mode I can log in to a TUI, in there I already tried to run

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ifup enp6s0
apt update && apt upgrade
update-initramfs -u
update-grub

with success, but later I still only boot to a black screen, no GUI or TUI, and my monitor informs: "no signal", can't even change to a TTY with <ctrl + alt + F1>.

Weirdly enough I can blindly type my username/password (after a <ctrl + alt +F1>) and runs commands like eject or reboot to notice that the system is working, but not with any UI.

Already tried to add nomodeset in the grub options, uninstalled the graphic drivers (Nvidia) but to no avail too.

What else could I do to recover the graphical access to the Debian partition after that change?

[Aki]

Hello,

After I swapped a motherboard/cpu from Intel to AMD I cannot login graphically anymore in the Debian partition of a dualboot system.

What is your new AMD cpu ? You can check with the command:

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apt install inxi
inxi -C

[igorfk]

Thank you for your input @Aki

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# inxi -C
CPU:
  Info: 6-core model: AMD Ryzen 5 5600 bits: 64 type: MT MCP cache: L2: 3 MiB
  Speed (MHz): avg: 2525 min/max: 2200/4467 cores: 1: 2200 2: 3500 3: 2200
    4: 2200 5: 2200 6: 2200 7: 2200 8: 2200 9: 3500 10: 2200 11: 2200 12: 3500

Turns out it was a graphics packages issue.

Had to purge not only previous firmware but also modules and utilities from "nvidia-*" packages, after that reinstall the latest firmware (from the gpu vendor ".run" script - probably the package from debian repository would work too) generating a proper new initrd image, kernel modules and configuration files. After that the graphical login and interface was restored.