Comment 11 for bug 1841826

Johan and also iMac, thank you...
I was trying to see whether this issue correlated with the type of cable between the dock and the external display; but obviously not since we're seeing it with both HDMI and DP.

I'm not suggesting that a particular item such as the Dropbox app, Logitech USB driver, etc is the cause; but I'm hoping that these observations may help those of you who are trying to reproduce the issue to do so. My background is application programming, not system; so I can offer anecdotal observations and check logs but am not able to dive into the code.

I do urge those of you who can to do so. This is once again progressing. This morning (and after having allowed the kernel update to 5.8.0.36.40 just a couple days ago), the system *froze* rather than going to sleep. First I lost the external display. So I opened the laptop lid (docked) and had a bizarre set of 3 or 4 error messages. Those cleared to solid black before I could get a pic. I couldn't get any response after that so had to do a hard power down. Not good! I brought the machine up standalone, let it idle a few minutes, shut it down, and put it back into the dock. Then it was back to this bug's suspend after login.

This again is Ubuntu 20.04.1, now the kernel just noted, on a T570 in the classic UltraDock using an external HDMI display, external Lenovo USB keyboard, and Logitech *bluetooth* mouse. Lid closed so external display is primary. Note that the Lenovo USB mouse has developed serious scroll wheel issues: I'm not yet sure whether that is Ubuntu or hardware. My overriding concern is that Ubuntu remains unstable at best since the mid September updates.