Ubuntu 21.04 stuck on black screen with blinking cursor at boot

Installed Ubuntu 21.04 on an Asus Rog Scar Strix 2021 laptop (AMD iGPU and Nvidia dGPU), successfully booted in, installed nvidia-driver-460 (proprietary, tested) drivers using additional drivers tab under the Software & Updates settings GUI.

Rebooted, and now i get stuck at a black screen with a blinking cursor in the top left indefinitely. I can boot in only after Ctrl +Alt + F2, Logging into a session via command line, logging out, then Ctrl + D until the GUI login shows up then i can resume using ubuntu like normal.

There is a quick flash of text before the GUI login screen shows up, displaying two lines of error:

[FAILED] Failed to start Load/Save Screen Backlight Brightness of backlight" acpi_video0

[FAILED] Failed to start Load/Save Screen Backlight Brightness of backlight" amdgpu_b10

uname -a produces Linux Strix 5.11.0-16-generic #17-Ubuntu SMP Wed Apr 14 20:12:43 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

How Can i remedy this so i am showed the normal GUI login when i start up ?

I do not have lightdm installed, is this something I need ?

Is this related to Ubuntu 21.04 using Wayland ?

Thanks in advance.

1 Answer

Okay after playing around i think i fixed it. Steps:

1. Via terminal run nvidia-settings
2. Click on PRIME Profiles on the left, and select NVIDIA On-Demand
3. Reboot

In my case it led to me seeing the normal Ubuntu GUI 21.04 login screen, and nvidia proprietary drivers are still installed and are able to be used.

Hopefully this works for you as well !