I have been using Pop OS for the past couple of days and it is running great. However, once in a while, the mouse gets stuck and the mouse pointer doesn't move and I can't click on anything with the mouse.

When it happened last time, I ran the dmesg command and I saw the following entries.

[78575.808008] usb 2-1.2: reset low-speed USB device number 4 using ehci-pci
[81012.289121] usb 1-1.3: reset full-speed USB device number 5 using ehci-pci

Does anyone know how to address this issue?

what kind of hardware is it?
did you try that mouse with another os/host ?
did you try another mouse?

Probably you will find it useful: https://www.cyberciti.biz/faq/rhel-r...peed-ehci_hcd/

Sorry that I missed to give enough info.

I am using an 2011 27" iMac as my daily driver. This mouse is working fine with other laptops.

I tried a different mouse with Pop OS on my iMac and it seems to be working fine.

I assume there is some hardware conflict between Pop OS and the iMac mouse that I am using.

again, see the link, you may try to blacklist kernel driver (at least to check if that works).

When I run the command "lspci | grep -i ehci_hcd", it outputs nothing.

When I run the command "lsusb -v | grep -i ehci_hcd", I get the below output.

Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing


Also, there is no directory with the name "ehci_hcd" under /sys/bus/pci/drivers. Below is the list of directories related to hci.

ahci
ehci-pci
firewire_ohci
ohci-pci
uhci_hcd


Any ideas?

and what will lsmod say?

I ran the command "lsmod | grep -i hci" and below is the output.

firewire_ohci 45056 0
ahci 40960 4
firewire_core 65536 1 firewire_ohci
libahci 36864 1 ahci

Thanks.

hm. probably the ehci driver is missing and that is the problem. Actually I don't know that OS and I don't know what kind of kernel is it.
Did you try to use another usb port?