I have upgraded only two systems here -- both have Nvidia graphics. Both systems boot to tty1 and there it ends. Among the boot messages flying by, I saw "Failed to start nvidia persistence daemon".
Here is one of the systems:
System:
Kernel: 5.15.16-1-siduction-amd64 x86_64 bits: 64
Desktop: KDE Plasma 5.23.5
Distro: siduction 18.3.0 Patience - kde - (201805132121)
Machine:
Type: Desktop Mobo: ASUSTeK model: ROG STRIX X299-E GAMING v: Rev 1.xx
serial: <superuser required> UEFI: American Megatrends v: 1401
date: 05/21/2018
CPU:
Info: quad core model: Intel Core i7-7740X bits: 64 type: MT MCP cache:
L2: 1024 KiB
Speed (MHz): avg: 3453 min/max: 800/4500 cores: 1: 3212 2: 3883 3: 3402
4: 1957 5: 3735 6: 2982 7: 4308 8: 4146
Graphics:
Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] driver: nvidia v: 495.44
Device-2: Logitech HD Pro Webcam C920 type: USB
driver: snd-usb-audio,uvcvideo
Display: x11 server: X.Org 1.20.14 driver: loaded: nvidia resolution:
1: 1920x1200~60Hz 2: 1920x1080~60Hz
OpenGL: renderer: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2
v: 4.6.0 NVIDIA 495.44
Back to kernel 5.15.16-1 and it's all good.
This is just to alert the users -- I will troubleshoot later.