Created attachment 852455 [details]
log of Nouveau errors with kernel 5.14-1

When you enter a section of X11 this crashes and you can't do anything else.

My test on Gnome-4 and GDM.
The problem occurs only on X11, while on Wayland it seems not to appear. But
this checks it with use these days 

I found the problem on the following kernels:
5.13.13
5.14.0
5.14.1

While does not occur with the kernel 5.13.12 which unfortunately uninstalled 

on X11
# inxi -GC

CPU:
  Info: 6-Core model: AMD Ryzen 5 2600 bits: 64 type: MT MCP cache: 
  L2: 3 MiB 
  Speed: 1377 MHz min/max: 1550/3400 MHz Core speeds (MHz): 1: 1377 2: 1375 
  3: 1375 4: 1378 5: 1377 6: 1447 7: 1602 8: 1375 9: 1384 10: 1376 11: 1374 
  12: 1377 
Graphics:
  Device-1: NVIDIA G96C [GeForce 9500 GT] driver: nouveau v: kernel 
  Device-2: Logitech Webcam C270 type: USB driver: snd-usb-audio,uvcvideo 
  Display: x11 server: X.org 1.20.13 driver: loaded: nouveau 
  unloaded: fbdev,modesetting,vesa resolution: <missing: xdpyinfo> 
  OpenGL: renderer: NV96 v: 3.3 Mesa 21.2.1 

on Wayland
# inxi -GC
CPU:
  Info: 6-Core model: AMD Ryzen 5 2600 bits: 64 type: MT MCP cache: 
  L2: 3 MiB 
  Speed: 3012 MHz min/max: 1550/3400 MHz Core speeds (MHz): 1: 3012 2: 1508 
  3: 2549 4: 1272 5: 1559 6: 1271 7: 2672 8: 1335 9: 3426 10: 1539 11: 1558 
  12: 1377 
Graphics:
  Device-1: NVIDIA G96C [GeForce 9500 GT] driver: nouveau v: kernel 
  Device-2: Logitech Webcam C270 type: USB driver: snd-usb-audio,uvcvideo 
  Display: wayland server: X.org 1.20.13 driver: loaded: nouveau 
  unloaded: fbdev,modesetting,vesa resolution: <missing: xdpyinfo> 
  OpenGL: renderer: NV96 v: 3.3 Mesa 21.2.1 


The log of Nouveau errors is attached