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#1 2020-12-23 22:03:03
- EisfreeF12
- Member
- Registered: 2020-11-08
- Posts: 4
[SOLVED] NVIDIDA GPU not being used (when using lightdm)
Hardware:
Dell Latitude 3400 (laptop)
Intel Core i7-8565 (CPU)
Intel UHD 620 (integrated GPU)
NVIDIA GeForce MX130 (discrete GPU)
Software:
5.9.14-arch1-1 (Linux kernel)
NVIDIA 455.45.01 (NVIDIA driver)
i3-gaps 4.19 (window manager)
lightdm 1.30.0 (display manager)
When I enter a TTY and begin my X session with startx, everything works normally. When I use lightdm, however, everything functions, but my NVIDIA GeForce MX130 graphics card is not used at all. Using nvidia-smi, there are several processes reported to be running such as xorg and kitty when I begin my session with startx, and my GPU usage is reported at around 126 MiB. But when I use lightdm, there are no processes and GPU usage is at 0.
I have followed the archwiki page for using NVIDIA graphics only with NVIDIA Optimus (my Dell Latitude 3400 has both NVIDIA and Intel graphics), including creating a display_setup.sh for lightdm and making it the display setup script in lightdm.conf, but it seems to not be working whatsoever.
Last edited by EisfreeF12 (2020-12-29 04:28:07)
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#2 2020-12-23 22:06:39
- V1del
- Forum Moderator
- Registered: 2012-10-16
- Posts: 21,740
Re: [SOLVED] NVIDIDA GPU not being used (when using lightdm)
Is the display_setup.sh execute/readable for the lightdm user?
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#3 2020-12-26 03:56:16
- EisfreeF12
- Member
- Registered: 2020-11-08
- Posts: 4
Re: [SOLVED] NVIDIDA GPU not being used (when using lightdm)
Yes, I ran
sudo chmod a=rwx /etc/lightdm/display_setup.shJust to double check and be be completely sure that those permissions were available for everything.
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#4 2020-12-26 09:02:03
- seth
- Member
- Registered: 2012-09-03
- Posts: 51,253
Re: [SOLVED] NVIDIDA GPU not being used (when using lightdm)
Make the script log the current date, eg. run "touch /tmp/display_setup.date" or "date >> /tmp/display_setup.date" to ensure it gets executed. If it's not, look at your lightdm.conf.
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#5 2020-12-29 04:27:27
- EisfreeF12
- Member
- Registered: 2020-11-08
- Posts: 4
Re: [SOLVED] NVIDIDA GPU not being used (when using lightdm)
I solved it, it was an incredibly mundane error! I accidentally forgot the exclamation mark in the #!/bin/sh line of my display_setup.sh, and that made it a comment and completely ruined it. After removing it, everything works smoothly. 
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