It looks like a udev issue: [ 3741.452547] usb 6-1: FTDI USB Serial Device converter now attached to ttyUSB0 [ 8753.827626] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0 [ 8754.276222] usb 6-1: FTDI USB Serial Device converter now attached to ttyUSB1
I assume the first trace in dmesg was before I suspended (grep resume/suspend on dmesg) [ 2.623823] ata4.01: failed to resume link (SControl 0) [ 8751.123223] PM: suspend entry (deep) [ 8752.137447] printk: Suspending console(s) (use no_console_suspend to debug) [ 8752.991970] ACPI: Low-level resume complete [ 8754.411859] ata4.01: failed to resume link (SControl 0) [ 8754.329696] PM: suspend exit I found a work around here: https://unix.stackexchange.com/questions/66901/how-to-bind-usb-device-under-a-static-name I will test it. Still, I think this shouldn't happen upon a resume, as it breaks the resume of minicom. If more info is needed about the device: looking at parent device '/devices/pci0000:00/0000:00:1d.1/usb6': KERNELS=="usb6" SUBSYSTEMS=="usb" DRIVERS=="usb" ATTRS{maxchild}=="2" ATTRS{bDeviceSubClass}=="00" ATTRS{bDeviceClass}=="09" ATTRS{urbnum}=="43" ATTRS{authorized_default}=="1" ATTRS{quirks}=="0x0" ATTRS{avoid_reset_quirk}=="0" ATTRS{bNumInterfaces}==" 1" ATTRS{manufacturer}=="Linux 5.4.0-24-generic uhci_hcd" ATTRS{interface_authorized_default}=="1" ATTRS{bNumConfigurations}=="1" ATTRS{bDeviceProtocol}=="00" ATTRS{version}==" 1.10" ATTRS{bMaxPower}=="0mA" ATTRS{authorized}=="1" ATTRS{product}=="UHCI Host Controller" ATTRS{speed}=="12" ATTRS{removable}=="unknown" ATTRS{serial}=="0000:00:1d.1" ATTRS{busnum}=="6" ATTRS{idVendor}=="1d6b" ATTRS{bmAttributes}=="e0" ATTRS{bConfigurationValue}=="1" ATTRS{tx_lanes}=="1" ATTRS{ltm_capable}=="no" ATTRS{devpath}=="0" ATTRS{rx_lanes}=="1" ATTRS{idProduct}=="0001" ATTRS{bcdDevice}=="0504" ATTRS{configuration}=="" ATTRS{bMaxPacketSize0}=="64" ATTRS{devnum}=="1" ** Package changed: ubuntu => udev (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1873648 Title: After suspend, ttyusb0 is moved to ttyusb1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1873648/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
