I have noticed that when I am at my desk with an external monitor plugged in via HDMI, if the machine suspends (either manually or auto after a period of inactivity), when I resume, it loads up my laptop display and the external monitor, then freezes/crashes back to the login just seconds after.
The external monitor is an LG 34GN850-B and this is my system:
[joel@jfed ~]$ inxi -v 3 System: Host: jfed Kernel: 5.15.4-201.fc35.x86_64 x86_64 bits: 64 compiler: gcc v: 2.37-10.fc35 Desktop: GNOME 41.1 Distro: Fedora release 35 (Thirty Five) Machine: Type: Laptop System: Razer product: Blade 15 Base Model (Early 2020) - RZ09-0328 v: 5.04 serial: <superuser required> Mobo: Razer model: DA550 v: 4 serial: <superuser required> UEFI: Razer v: 01.06 date: 09/16/2020 Battery: ID-1: BAT0 charge: 67.3 Wh (100.0%) condition: 67.3/65.0 Wh (103.6%) volts: 17.5 min: 15.4 model: Razer Blade status: Full CPU: Info: 6-Core model: Intel Core i7-10750H bits: 64 type: MT MCP arch: Comet Lake rev: 2 cache: L2: 1.5 MiB flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 62399 Speed: 2098 MHz min/max: 800/5000 MHz Core speeds (MHz): 1: 900 2: 1306 3: 1987 4: 966 5: 1542 6: 900 7: 902 8: 1674 9: 905 10: 922 11: 900 12: 900 Graphics: Device-1: Intel CometLake-H GT2 [UHD Graphics] vendor: Razer USA driver: i915 v: kernel bus-ID: 00:02.0 Device-2: NVIDIA TU106M [GeForce RTX 2060 Mobile] vendor: Razer USA driver: nouveau v: kernel bus-ID: 01:00.0 Device-3: IMC Networks USB Camera type: USB driver: uvcvideo bus-ID: 1-7:5 Display: wayland server: X.Org 126.96.36.199 compositor: gnome-shell driver: loaded: modesetting resolution: 1: 3440x1440~85Hz 2: 1920x1080~144Hz OpenGL: renderer: Mesa Intel UHD Graphics (CML GT2) v: 4.6 Mesa 21.2.5 direct render: Yes
You can see under Graphics it shows my external device is recognised (1: 3440x1440~85Hz). Display settings also shows them at joined at the built-in display as the primary. I’m wondering if X11/Wayland might have something to do with it?
I believe the dGPU (RTX 2060) is hardwired to the HDMI port, so suspect this may also be an NVIDIA issue, but the monitor works fine on the nouveau driver until I suspend/wake.
I assume I will need to provide some more specific information, so let me know what I need to gather to give a clearer picture.