Arch Linux

Wodah

Member

Registered: 2025-05-10

Posts: 3

No login screen on tty1 after second GPU passthrough

Hi,

I'm in a bit of a pickle.
My current setup has an NVIDIA gpu and an AMD gpu. The AMD is being used for my arch host, and the NVIDIA is passed through to a KVM VM.
The passthrough works perfectly, however when I boot my pc, the SDDM login screen doesn't show up at all. I have to switch to tty2 and manually start my DE.
I have KDE installed, and I'm using hyprland.
I tried different mkinitcpio.conf configs, even specifically adding amdgpu (which if I understand correctly I don't need to do at all): MODULES=(vfio_pci vfio vfio_iommu_type1 amdgpu)
I tried messing around with the systemd-boot config, adding "quiet splash video=efifb:off amdgpu.dc=1" with no success.
Now this is not a huge issue as I'm still able to use the system, but it is quite tedious to switch the tty and manually start my DE every time I boot.

Output of lspci -k | grep -EA3 'VGA|3D|Display':
01:00.0 VGA compatible controller: NVIDIA Corporation Device 2d04 (rev a1)
    Subsystem: InnoVISION Multimedia Ltd. Device 205e
    Kernel driver in use: vfio-pci
    Kernel modules: nouveau
--
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 33 [Radeon RX 7600/7600 XT/7600M XT/7600S/7700S / PRO W7600] (rev c0)
    Subsystem: Gigabyte Technology Co., Ltd Device 2418
    Kernel driver in use: amdgpu
    Kernel modules: amdgpu
--
0f:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raphael (rev c4)
    Subsystem: ASUSTeK Computer Inc. Device 8877
    Kernel driver in use: amdgpu
    Kernel modules: amdgpu

Thank you for the help!

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 14,845

Re: No login screen on tty1 after second GPU passthrough

That output suggests you have 3 videocards in your system :
- amd raphael (integrated in your processor)
- amd Navi33 discrete card
- nvidia discrete card

Which card is set as default in the firmware of the system ?

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky

Wodah

Member

Registered: 2025-05-10

Posts: 3

Re: No login screen on tty1 after second GPU passthrough

In UEFI it says that the primary video device is PCIE. The only other option is integrated.
I don't see any other options to change the order.
The nvidia gpu is in the top pcie slot (which would be the primary I assume), and the amd is below. This was done as the bottom slot is connected to the chipset, and I wanted to avoid having to do the ACS override.

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 14,845

Re: No login screen on tty1 after second GPU passthrough

That suggests some possibilities :
- set the integrated card as default and use https://wiki.archlinux.org/title/PRIME to run some apps on the discrete amdgpu card
- configure sddm to use the discrete amd card (no idea if that's doable)

---

Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky

Wodah

Member

Registered: 2025-05-10

Posts: 3

Re: No login screen on tty1 after second GPU passthrough

After messing around more, I decided to keep it simple.
I disabled sddm and added a line to .zshrc to start hyprland after login:

[[ $(tty) == /dev/tty1 ]]&&exec hyprland

I don't need a fancy screen just to put in my password. I might revisit this in the future, but for now "if it ain't broke don't fix it".
Thanks anyways!