I got my new board working like the old board. I'm starting to think this false detection is not a problem with udev or systemd, but actually the board appearing as one device, such as a flash bootloader, then disconnecting itself and reconnecting as another ACM serial device.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1539348 Title: udevadm info reports wrong ID_MODEL_ID and ID_VENDOR_ID for USB serial port Status in qtserialport-opensource-src package in Ubuntu: Confirmed Status in systemd package in Ubuntu: Confirmed Bug description: Running udevadm info with the device path of a virtual serial port created by a USB device (in this case a Particle Photon development board) returns the ID_MODEL_ID and ID_VENDOR_ID for the USB host controller instead of the Particle device. The consequence is mis-detection of the device associated with a virtual serial port in applications. udevadm info with the virtual serial port. Expect ID_MODEL_ID=c00a and ID_VENDOR_ID=2b04 $ udevadm info --query=property -p /devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/tty/ttyACM0 DEVLINKS=/dev/serial/by-id/pci-Particle_Electron_00000000050C-if00 /dev/serial/by-path/pci-0000:00:14.0-usb-0:1:1.0 DEVNAME=/dev/ttyACM0 DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/tty/ttyACM0 ID_BUS=pci ID_MODEL=Electron ID_MODEL_ENC=Electron ID_MODEL_FROM_DATABASE=7 Series/C210 Series Chipset Family USB xHCI Host Controller (Zenbook Prime UX31A) ID_MODEL_ID=0x1e31 ID_PATH=pci-0000:00:14.0-usb-0:1:1.0 ID_PATH_TAG=pci-0000_00_14_0-usb-0_1_1_0 ID_PCI_CLASS_FROM_DATABASE=Serial bus controller ID_PCI_INTERFACE_FROM_DATABASE=XHCI ID_PCI_SUBCLASS_FROM_DATABASE=USB controller ID_REVISION=0200 ID_SERIAL=Particle_Electron_00000000050C ID_SERIAL_SHORT=00000000050C ID_TYPE=generic ID_USB_CLASS_FROM_DATABASE=Communications ID_USB_DRIVER=cdc_acm ID_USB_INTERFACES=:020201:0a0000: ID_USB_INTERFACE_NUM=00 ID_VENDOR=Particle ID_VENDOR_ENC=Particle ID_VENDOR_FROM_DATABASE=Intel Corporation ID_VENDOR_ID=0x8086 MAJOR=166 MINOR=0 SUBSYSTEM=tty TAGS=:systemd: USEC_INITIALIZED=4586285779 Running udevadm info with the base device path gives expected IDs $ udevadm info --query=property -p /devices/pci0000:00/0000:00:14.0/usb1/1-1 BUSNUM=001 DEVNAME=/dev/bus/usb/001/008 DEVNUM=008 DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-1 DEVTYPE=usb_device DRIVER=usb ID_BUS=usb ID_MODEL=Electron ID_MODEL_ENC=Electron ID_MODEL_ID=c00a ID_REVISION=0200 ID_SERIAL=Particle_Electron_00000000050C ID_SERIAL_SHORT=00000000050C ID_USB_INTERFACES=:020201:0a0000: ID_VENDOR=Particle ID_VENDOR_ENC=Particle ID_VENDOR_ID=2b04 MAJOR=189 MINOR=7 PRODUCT=2b04/c00a/200 SUBSYSTEM=usb TYPE=2/0/0 USEC_INITIALIZED=4585731209 Running lsusb gives the expected IDs. $ lsusb -v Bus 001 Device 008: ID 2b04:c00a Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 2 Communications bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 64 idVendor 0x2b04 idProduct 0xc00a bcdDevice 2.00 iManufacturer 1 Particle iProduct 2 Electron iSerial 3 00000000050C bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 67 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xc0 Self Powered MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 2 Communications bInterfaceSubClass 2 Abstract (modem) bInterfaceProtocol 1 AT-commands (v.25ter) iInterface 0 CDC Header: bcdCDC 1.10 CDC Call Management: bmCapabilities 0x00 bDataInterface 1 CDC ACM: bmCapabilities 0x02 line coding and serial state CDC Union: bMasterInterface 0 bSlaveInterface 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 255 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Device Status: 0x0001 Self Powered $ lsb_release -rd Description: Ubuntu 15.10 Release: 15.10 $ apt-cache policy udev udev: Installed: 225-1ubuntu9 Candidate: 225-1ubuntu9 Version table: *** 225-1ubuntu9 0 500 http://archive.ubuntu.com/ubuntu/ wily/main amd64 Packages 100 /var/lib/dpkg/status ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: udev 225-1ubuntu9 ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6 Uname: Linux 4.2.0-25-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 CurrentDesktop: Unity CustomUdevRuleFiles: 50-particle.rules 10-pololu-programmer.rules 49-teensy.rules 99-openocd.rules 96-monitor-hotplug.rules 51-android.rules Date: Thu Jan 28 15:33:38 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2013-05-09 (994 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: ASUSTeK COMPUTER INC. UX31A ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-generic root=UUID=99e110b2-cdee-4df1-ab50-25fea2fd4f30 ro splash quiet vt.handoff=7 SourcePackage: systemd UpgradeStatus: Upgraded to wily on 2015-10-27 (93 days ago) dmi.bios.date: 01/31/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX31A.218 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX31A dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX31A.218:bd01/31/2013:svnASUSTeKCOMPUTERINC.:pnUX31A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX31A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: UX31A dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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