First time poster, short time Linux user (about a 9 mos). I'm having trouble getting my Linux Mint 20 Cinammon OS to recognize an external monitor. I've tried multiple monitors and HDMI cords, to no avail. Xrandr doesn't appear to recognize the monitor either. I'm almost positive the reason is because Secure Boot is enabled from the Bios. The problem is, everytime I disable Secure Boot, my computer boots to the Linux Mint logo, then a black screen, and then that's it.

My hardware is a Predator Triton 500 that originally had Windows installed. I just upgraded to Linux Mint 20 Cinammon from 19.3. The same issue plagued me with 19.3 so I don't think it has to do with the upgrade (went smoothly for me for the most part).

If anyone can help me disable the Secure Boot, without my system crashing, I think the dual monitors should work, according to other forums. Thanks so much in advance for any help anyone can give.

Secure boot should not affect the way the OS runs. If you are sure the monitor works, have you tried any other HDMI monitor with the computer? Maybe the port on the computer is the issue, or it might be a driver? Are you using the nouveau driver or the Nvidia?

Looking at the Acer forum: https://community.acer.com/en/discus...tor-triton-500
"The opensource driver does not work correctly on some PGU models.
If this is the case, just add rd.driver.blacklist = nouveau as parameters at kernel startup (grub).
This option will ignore the driver and use iGPU. "

1 members found this post helpful.

Why ask about only two as if only two existed, for a GPU for which more than two competent ones exist? Has OP tried the default (which is provided by the X server: modesetting).

Thanks so much for the response.I'm using the nvidia-driver-450 and, as I stated in my first message, I have tried multiple monitors/cords to no avail. Appreciate anymore advice you can give, since I'm not using the nouveau drivers

I normally am on the Nvidia drivers. I switched to Nouveau just to see if that was the problem but that didn't work. I still need to try blacklisting nouveau, just haven't had time to dive into grub yet.

How about booting the computer from a live USB linux to test if the port on the computer works with it. That way we can test if this is a bug with your install or bad hardware on the computer.

I tried this with no luck either.