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I am using an 99% dead screen old HP laptop running on ubuntu 20.04 with an external monitor. Today morning when I tried to boot my system, it shows an error- "DMAR: [Firmware Bug]: No firmware reserved region can cover this"

I can read this line only on my laptop screen as the screen is almost dead in the below portion. And the external monitor don't work before complete booting up.

I have read this solution DMAR firmware bug. Broken BIOS? but I am still confused as I need to type the command blindly. What can I do now? Anyone can help please? Thanks

Maruf Adnan
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  • Many laptops have the capacity to switch modes from internel/external/internal+external-mirror/internal+external-beside/etc.. via a fn+key toggle. This is done in firmware; ie. if your firmware allows for it it'll work. It's commonly available on dell/hp/lenovo esp. enterprise grade (often missing on cheaper consumer models). That's what I'd use. Firmware is a hardware issue, as Ubuntu is only involved once it's booted. – guiverc Nov 06 '21 at 21:07

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