Two random USB hard drives connected to a Ubuntu 20.04 system via a 16-port USB 3.0 hub will disconnect on its own after some time. There are 16 USB hard drives attached to this USB hub. The disconnected devices must be power cycled in other for Ubuntu to detect them again via lsblk. Simply reconnecting the USB cables of these disconnected devices will not work.
After power cycling the disconnected USB drives, the same 2 drives will disconnect again shortly after. If the USB hub is power cycled, sometimes a different set of 2 drives will disconnect.
The system is already configured to disable USB autosuspend by editing GRUB by having this line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash usbcore.autosuspend=-1"
Autosuspend also appears to be successfully disabled.
$ cat /sys/module/usbcore/parameters/autosuspend
-1
Are there other settings to try to prevent these random USB device disconnects?
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