Dual monitor, second monitor does not display after Ubuntu20.04 fell asleep

Tom

2/5/23, 6:52 PM

Ubuntu20.04 does not detect second monitor, the monitor says "no signal detected", everytime it falls asleep. When I turned off the power of monitor, and unplugged the HDMI cable, the Ubuntu does not change the display mode. It is extended mode and my second monitor is the primary display. I can't see the login GUI because my second monitor does not display.

Moreover, the single display mode is glitchy. All the buttons and items in GUI respondes slowly, it takes about 4 seconds to interact with it. Two problems above exists in Ubuntu20.04, but none of that happens in Windows10, I get a dual boot computer. I believe the solution is up to the upgrade of Ubuntu someday.

By the way, I usually change my display mode after login, and the second monitor is able to receive the signal, then I revert the settings to get back to normal. Otherwise, I am only able to wake my main screen by reboot the computer, which is not a good idea for the most time.

$ uname -a
Linux *** 5.11.0-37-generic #41~20.04.2-Ubuntu SMP Fri Sep 24 09:06:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ inxi-G
inxi-G: command not found
$ sudo lspci -v | grep 'VGA'
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Mobile) (prog-if 00 [VGA controller])
01:00.0 VGA compatible controller: NVIDIA Corporation TU117GLM [Quadro T2000 Mobile / Max-Q] (rev a1) (prog-if 00 [VGA controller])

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display

multiple-monitors

hdmi

20.04

kanehekili

2/5/23, 7:13 PM

Show us `inxi-G` and `sudo lspci -v | grep 'VGA'` Copy the output of terminal and paste it into your question - you can use the **edit** link below your question

Elon Musk

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

EN: Dual monitor, second monitor does not display after Ubuntu20.04 fell asleep

TH: จอภาพคู่ จอภาพที่สองไม่แสดงหลังจาก Ubuntu20.04 หลับ

RO: Monitor dublu, al doilea monitor nu se afișează după ce Ubuntu20.04 a adormit

RU: Двойной монитор, второй монитор не отображается после того, как Ubuntu20.04 заснул

VI: Màn hình kép, màn hình thứ hai không hiển thị sau khi Ubuntu20.04 ngủ

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