The meaning of nouveau errors and how to fix them

Hello, this driver has a problem with my graphic card (Geforce 9400GT). In the attached file, there is the output of the following commands:

1. sudo dmesg --level err
2. sudo dmesg --level warn
3. sudo dmesg | grep -i nouveau

dmesg.txt

sample:

root@realmb-M52L-S3P:/home/realmb# dmesg --level err

[ 42.788730] nouveau 0000:02:00.0: vp: init failed, -2

[ 42.788817] nouveau 0000:02:00.0: bsp: init failed, -2

[ 43.127296] nouveau 0000:02:00.0: vp: init failed, -2

[ 43.127342] nouveau 0000:02:00.0: bsp: init failed, -2

[ 59.340203] nouveau 0000:02:00.0: vp: init failed, -2

[ 59.340243] nouveau 0000:02:00.0: bsp: init failed, -2

[ 59.401307] nouveau 0000:02:00.0: vp: init failed, -2

[ 59.401354] nouveau 0000:02:00.0: bsp: init failed, -2

[ 90.177784] nouveau 0000:02:00.0: vp: init failed, -2

[ 90.177839] nouveau 0000:02:00.0: bsp: init failed, -2 `