Nvidia-375,Black Screen,Tainting kernel,module verification failed,required key missing

[Sven.Frings]

Hey Dear Nvidia Delevopers,I found perhaps a bug in

Ubuntu 16.04/Mint18.1

That bug make´s me crazy it´s not possible to switch from

intel to your nvidia grafic´s card coz this message i found within

the kernel log

dmesg |grep nvidia

[ 4.481893] nvidia: module license 'NVIDIA' taints kernel.
[ 4.485559] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[ 4.491284] nvidia 0000:01:00.0: enabling device (0006 -> 0007)
[ 4.491472] nvidia-nvlink: Nvlink Core is being initialized, major device number 246
[ 4.502637] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 375.39 Tue Jan 31 19:41:48 PST 2017
[ 4.507277] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
[ 4.601256] nvidia-uvm: Loaded the UVM driver in 8 mode, major device number 245
[ 5.523191] nvidia-uvm: Unloaded the UVM driver in 8 mode
[ 5.550658] [drm] [nvidia-drm] [GPU ID 0x00000100] Unloading driver
[ 5.571930] nvidia-modeset: Unloading
[ 5.590508] nvidia-nvlink: Unregistered the Nvlink Core, major device number 246

System: Host: sven-SATELLITE-P875 Kernel: 4.4.0-70-generic x86_64 (64 bit) Desktop: Cinnamon 3.2.7
           Distro: Linux Mint 18.1 Serena
Machine: System: TOSHIBA (portable) product: SATELLITE P875 v: PSPLFE-04G00RGR
           Mobo: TOSHIBA model: Portable PC v: MP Bios: Insyde v: 6.20 date: 12/12/2012
CPU: Quad core Intel Core i7-3630QM (-HT-MCP-) cache: 6144 KB
           clock speeds: max: 3400 MHz 1: 2781 MHz 2: 3349 MHz 3: 1271 MHz 4: 3261 MHz 5: 2324 MHz
           6: 3365 MHz 7: 3076 MHz 8: 3367 MHz
Graphics: Card-1: Intel 3rd Gen Core processor Graphics Controller
           Card-2: NVIDIA GK107M [GeForce GT 640M]
           Display Server: X.Org 1.18.4 driver: intel Resolution: 1920x1080@60.50hz
           GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 12.0.6
Audio: Card Intel 7 Series/C210 Series Family High Definition Audio Controller driver: snd_hda_intel
           Sound: Advanced Linux Sound Architecture v: k4.4.0-70-generic
Network: Card-1: Qualcomm Atheros AR8161 Gigabit Ethernet driver: alx
           IF: enp7s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
           Card-2: Intel Centrino Wireless-N 2230 driver: iwlwifi
           IF: wlp8s0 state: down mac: <filter>
Drives: HDD Total Size: 1960.4GB (19.7% used) ID-1: /dev/sda model: SanDisk_SDSSDHII size: 960.2GB
           ID-2: /dev/sdb model: TOSHIBA_MQ01ABD1 size: 1000.2GB
Partition: ID-1: / size: 865G used: 197G (24%) fs: ext4 dev: /dev/sda1
           ID-2: swap-1 size: 17.06GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 49.0C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info: Processes: 246 Uptime: 25 min Memory: 1228.3/15934.6MB Client: Shell (bash) inxi: 2.2.35

[crroush (crroush)]

I have a similar issue. Only work around I know is toggling on and off secure boot in my bios.

So you start with "sudo prime-select nvidia", reboot press f2 or whatever your bios requires. Disable secure boot. Boot and your nvidia drivers should work. To switch back to intel do "sudo prime-select intel" reboot and enable the secure boot.

This is absolutely horrible work around but it is all I have found that reliably works.