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After trying out the suggestions here, which did not solve my issue, I decided to ask the question:

I have a freshly installed Ubuntu 18.04 LTS on my Thinkpad T14, but I can not connect to an external monitor via HDMI cable. I tried it with 2 different displays so the source of the problem should be on the laptop side.

Can someone help me out solving it? Thanks in advance!

OnurA
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2 Answers2

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I have solved it by updating to a new kernel. Ubuntu 20.04 LTS comes with a Kernel 5.4.0 which was problematic both for HDMI and also screen brightness adjustment in my case.

Solution: I simply updated to a newer Kernel, (5.9.0 in my case) and those issues were solved without any additional step required. I hope this helps many others who are disappointed at the moment and reading this page.

OnurA
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for me on Lenovo Thinkpad E15

I did upgrade to the Linux kernel 5.0 and linux-firmware to the latest version by using the following commands:

sudo apt-get install linux-oem-osp1 linux-firmware

sudo reboot

the problem was solved.

IS_Eagle_NG
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