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Old 12-30-2021, 11:56 AM   #1
maxmonz
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Default USB cut off

Hi,

I have a Lenovo Thinkpad T580 notebook connected to an i-Tec docking station via usb-c cable. All USB peripherals (mouse, keyboard, etc.) and 2 monitors (HDMI) are connected to the docking station.
I used DisplayLink driver to make everything working fine until the version 5.4.0.89 of Linux kernel.
With version 5.4.0.90 and the latest 5.4.0.91 a strange situation occurs. Occasionally the monitors darken and even the mouse does not respond. From in-depth analysis it seems that there is a problem on the USB bus for which the devices are disconnected for a few seconds until everything starts working again.
It is definitely a problem related to the new kernels because everything was fine with the previous ones.
Anyone have an idea and can help me?
Thanks
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Old 01-10-2022, 10:06 AM   #2
snipe122
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Facing the same issue. I also think it's related to the latest kernel / firmware somehow. Not sure if it is a Displaylink problem at all, maybe it's connected to USB firmware.

I have only bluetooth mouse / keyboard and cannot connect my monitor directly to the laptop. Maybe to test, can you connect everything directly to your computer and see if keyboard / mouse stop working at some point? That would indicate a problem with the USB firmware itself which then kills our displaylink docks as well
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Old 01-20-2022, 07:24 AM   #3
snipe122
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I just remembered that i had this fix applied before. Trying it again now, either it got vanished due to some update or at least something reactivated this behavior. I think I remember that I had undone this fix after some upgrade and it was working fine since but now it started again.

Comment out this line in /etc/pulse/default.pa

Code:
### Automatically suspend sinks/sources that become idle for too long
# load-module module-suspend-on-idle
I'll report back how it goes. Just had a blackout before and applied the fix now. If I don't get another blackout during the day I guess this fix is working again.
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Old 01-20-2022, 07:35 AM   #4
snipe122
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Just got a blackout again, you can forget about this "fix" then.
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Old 01-24-2022, 07:34 PM   #5
maxmonz
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I was hoping...
I didn't try yet to connect mouse and kboard directly to the notebook because I always forget.
I will
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Old 01-25-2022, 10:49 PM   #6
maxmonz
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I tried to connect mouse and keyboard to the notebook instead of the docking station.
I have the same problem.
There is something related to kernel that cut usb. It can't be explained in any other way.

Last edited by maxmonz; Yesterday at 07:32 AM.
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