2nd Monitor not Working after Kernel Upgrade

Written by James McDonald

July 25, 2021

Ubuntu 20.04.2 LTS with a 460.80 Nvidia Driver

Just did an upgrade from 5.8.0-59-generic to 5.8.0-63-generic kernel last night and this morning my monitor connected to the VGA port on the card failed to work

sudo lshw -c video
  *-display                 
       description: VGA compatible controller
       product: GK208B [GeForce GT 710]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:29:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:86 memory:fb000000-fbffffff memory:e0000000-e7ffffff memory:e8000000-e9ffffff ioport:e000(size=128) memory:fc000000-fc07ffff

Temporary solution

Entering the Grub Boot Menu when using Secure / UEFI Boot

As my computer is running Secure Boot and UEFI I pressed the escape key just before I see the “Ubuntu” logo during boot to get into the grub menu

Boot to the last known good kernel

From the grub menu I select advanced options and then choose the previous kernel

Make Ubuntu Boot the Last Booted Kernel

Then if you want to stay at that kernel while you wait for a newer non problematic kernel / video driver package. Set the default boot kernel to the last one you used with the following:

https://askubuntu.com/questions/1308901/setting-older-kernel-version-as-default

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