Hello,
I have an Asus Zephyrus GM501GS with dual boot Ubuntu 22.04 LTS and Windows 10. The graphics card is a GeForce GTX 1070 6GB.
When I do a normal boot, there is no flashing white line in the upper left corner. This is present when I go into recovery mode. Once I’ve validated “resume” in recovery mode when exiting, rather than returning to the desktop, the famous flashing white line appears in the top left-hand corner.
I managed to get around the problem when I replaced “quiet splash” with “nomodeset” in the command prompt at Ubuntu startup. The reboot after going through recovery mode went fine. Putting back “quiet splash” replaces it.
During installation, I had to use the graphical safe mode because I had a crash using the normal procedure. In the documentation, it says that after using this mode you have to go back to the recovery mode and then click on “resume” and that’s when it crashes.
I modified the GRUB_CMDLINE_LINUX_DEFAULT= line by adding nvidia-drm.modeset=1 to make it GRUB_CMDLINE_LINUX_DEFAULT=“nvidia-drm.modeset=1”.
then I put the command sudo grub-mkconfig -o /boot/grub/grub.cfg (and not sudo grub2-mkconfig -o /boot/grub/grub.cfg because I had an error)
As it didn’t change anything, I was going to put the value back but I forgot to take note of what was marked…
I hope I’ve made myself clear.