On a fully-updated system with Nvidia graphics, during kernel 5.14.3 boot process, transition to the gui fails. No problem on a system with Intel graphics. No problem on this system with kernel 5.13.15
Graphics: Device-1: NVIDIA GM107 [GeForce GTX 750 Ti] driver: nvidia v: 470.57.02
Display: x11 server: X.Org 1.20.11 driver: loaded: nvidia unloaded: fbdev,modesetting,nouveau,vesa
resolution: 1366x768~60Hz
OpenGL: renderer: NVIDIA GeForce GTX 750 Ti/PCIe/SSE2 v: 4.6.0 NVIDIA 470.57.02
Error output found in ~/.local/share/xorg/Xorg.0.log:
[ 210.869] (EE) [drm] Failed to open DRM device for pci:0000:04:00.0: -19
[ 210.869] (EE) open /dev/dri/card0: No such file or directory
[ 210.869] (WW) Falling back to old probe method for modesetting
[ 210.869] (EE) open /dev/dri/card0: No such file or directory
[ 210.869] (II) Loading sub module "fbdevhw"
[ 210.869] (II) LoadModule: "fbdevhw"
[ 210.869] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 210.869] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 210.869] compiled for 1.20.11, module version = 0.0.2
[ 210.869] ABI class: X.Org Video Driver, version 24.1
[ 210.870] (EE) Unable to find a valid framebuffer device
[ 210.870] (WW) Falling back to old probe method for fbdev
[ 210.870] (II) Loading sub module "fbdevhw"
[ 210.870] (II) LoadModule: "fbdevhw"
[ 210.870] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 210.870] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 210.870] compiled for 1.20.11, module version = 0.0.2
[ 210.870] ABI class: X.Org Video Driver, version 24.1
[ 210.870] (EE) open /dev/fb0: Permission denied
[ 210.870] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[ 210.870] (EE) Screen 0 deleted because of no matching config section.
[ 210.870] (II) UnloadModule: "modesetting"
[ 210.870] (EE) Screen 0 deleted because of no matching config section.
[ 210.870] (II) UnloadModule: "fbdev"
[ 210.870] (II) UnloadSubModule: "fbdevhw"
[ 210.870] (II) Loading sub module "vbe"
[ 210.870] (II) LoadModule: "vbe"
[ 210.870] (II) Loading /usr/lib/xorg/modules/libvbe.so
[ 210.870] (II) Module vbe: vendor="X.Org Foundation"
[ 210.870] compiled for 1.20.11, module version = 1.1.0
[ 210.870] ABI class: X.Org Video Driver, version 24.1
[ 210.870] (II) Loading sub module "int10"
[ 210.870] (II) LoadModule: "int10"
[ 210.870] (II) Loading /usr/lib/xorg/modules/libint10.so
[ 210.871] (II) Module int10: vendor="X.Org Foundation"
[ 210.871] compiled for 1.20.11, module version = 1.0.0
[ 210.871] ABI class: X.Org Video Driver, version 24.1
[ 210.871] (II) VESA(0): initializing int10
[ 210.872] (EE) VESA(0): Cannot read int vect
[ 210.872] (II) UnloadModule: "vesa"
[ 210.872] (II) UnloadSubModule: "int10"
[ 210.872] (II) Unloading int10
[ 210.872] (II) UnloadSubModule: "vbe"
[ 210.872] (II) Unloading vbe
[ 210.872] (EE) Screen(s) found, but none have a usable configuration.
[ 210.872] (EE)
Fatal server error:
[ 210.872] (EE) no screens found(EE)
[ 210.872] (EE)
Please consult the The X.Org Foundation support at http://wiki.x.org for help.
[ 210.872] (EE) Please also check the log file at "/home/don/.local/share/xorg/Xorg.0.log" for additional information.
[ 210.872] (EE)
[ 210.898] (EE) Server terminated with error (1). Closing log file.
There is no configuration file in /etc/X11/xorg.conf.d/.
That's what I found so far.
EDIT: When booted into the new kernel, lsmod shows there is no nvidia module.