Arch Linux

Skanky Yoda

Member

Registered: 2017-05-31

Posts: 1

LightDM managed Intel & Nvidia fine but GDM doesn't. Why?

I'm running a tower with an Nvidia 970 and integrated intel graphics on the motherboard. The primary display is connected to the card through HDMI and the secondary to the motherboard through VGA.

I was using LightDM and had no issues, both displays would project and nvidia-settings ran fine. I switched to GDM and upon reboot only the Intel (motherboard secondary) monitor was detected. Nvidia settings would not run and no secondary monitor was detected. Switching back to LightDM, it detected both with no issues.

I disabled use of integrated graphics on my motherboard and now GDM can detect both (by plugging monitor into graphics card). So issue so to speak is solved, by why the hell did this occur at all? Shouldn't the Xorg.conf be read the same regardless of display manager?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,435

Re: LightDM managed Intel & Nvidia fine but GDM doesn't. Why?

GDM uses wayland by default now and likely decided, since it detected a capable intel card, to start in wayland mode, which doesn't work on the Nvidia just like that (or if it does, very unlikely to work in such a dual card environment).