I have set up my new work equipment, which includes the following devices:
- Lenovo P1 Gen 2
- Think Pad Thunderbolt 3 Dock Gen 2
- 2 x HP Z32 80 cm (31,5" ) 4K-UHD Workstation-Monitor
The problem which occured during operation is that the monitors are not running stable. Additionally some screen rambling occurs (Image of the problem added at the bottom).
I am using the following Ubuntu version:
- Operating System: Ubuntu 18.04.3 LTS
- Kernel: Linux 5.3.7-050307-generic
- Architecture: x86-64
Does anybody face the same problem as i did? How can I solve it?
3 Answers
I've had a similar problem with a docking station in the past. The issue turned out to be the cable I was using, by switching to new DisplayPort cabled the issue was resolved.
Another thing to check would be your configured refresh rate. I think that docking station only supports 30 Hz when connected to two 4k Monitors.
On the other hand, I've ordered a similar configuration and will be able to test if I also have the issue soon. Do you mind sharing how you installed the 5.3 kernel, I see that 18.04.3 normally ships with 5.0. I had been thinking to install 19.10 to get the new kernel, but LTS stability would be nice.
4An update of the firmware of the USB-C dock fixed this issue for me. Unfortunately, you need to boot into windows to run the installer. Maybe you can get it working with wine.
I realize now that this firmware does not help for your Thunderbolt based dock.
I had the same problem and solved it by upgrading the Ubuntu kernel. I upgraded my Kernel from 5.4.0 to 5.7.0 and the problem was solved.
I used the following posts to install kernel 5.7.0:
And following post to turn off the secure boot to avoid "boot/vmlinuz-5.7.0 has an invalid signature" error during rebooting to 5.7.0:
I hope it helps.
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