Kubuntu 20.04 black screen on initial power on - new problem

Patrick McManus

11/28/22, 11:37 AM

My HP Elite desktop computer (quad core Intel i5, 12 GB RAM) recently developed a problem after running problem-free on Kubuntu 20.04 for over a year. Now, when I first power on in the morning, I can hear it booting but the monitor remains blank. There is a signal to the monitor because its power indicator remains green, whereas it turns yellow when there is no input signal. No key combination can bring anything to the display. The only solution is to force a power off on the computer, then power on again. On this second power-on, it invariably boots normally with the display working.

I was running with two display adapters - the onboard Intel chipset and a Geox secondary display adapter to which the monitor was connected. Suspecting a failure in that adapter or a driver problem, I removed the display adapter and plugged the monitor into the onboard video port, but the problem persists.

I edited the grub config source and added the "nomodeset" directive, and rebuilt the primary grub config but the problem persisted.

All current updates are applied, no proprietary drivers in use. I can't think of anything I have installed in the past few weeks that would have caused this problem to suddenly arise.

Anybody have any ideas?

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Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Kubuntu 20.04 black screen on initial power on - new problem

TH: Kubuntu 20.04 หน้าจอดำเมื่อเปิดเครื่องครั้งแรก - ปัญหาใหม่

RO: Ecran negru Kubuntu 20.04 la pornirea inițială - problemă nouă

RU: Черный экран Kubuntu 20.04 при первом включении — новая проблема

VI: Màn hình đen Kubfox 20.04 khi bật nguồn ban đầu - sự cố mới

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