Hi Tomas, mmh, may be it has something to do with cdc_acm.
On Debian 10, where the reading is okay, cdc_acm is inserted in the kernel if I insert the device. If I 'rmmod cdc_acm' the /dev/ttyACM0 disappears und so I cannot read from the device. Perhaps I have to deactivate the registration of 1f61:0001? Best regards Claudia Am Samstag, 12. November 2022, 11:01:42 CET schrieb to...@tuxteam.de: > On Sat, Nov 12, 2022 at 09:38:34AM +0100, Claudia Neumann wrote: > > Am Freitag, 11. November 2022, 19:37:08 CET schrieb to...@tuxteam.de: > > > On Fri, Nov 11, 2022 at 04:38:21PM +0100, Claudia Neumann wrote: > > > > Hi Tomas, > > > > Hi Tomas, > > > > I did as you said. You find the results in the attachments. > > > > There is a differenz in udev behaviour on inserting the device. Perhaps it > > is this Flexocard identification. The device I am using is not a > > Flexocard device. I don't know if there is a relation between Zemo, the > > manufacturer of the VML-GK2, and Flexocard. > Oh, that is interesting: either Zenmo has a Flexocard "heart" or > they are squatting on their IDs (that would be improbable, but not > completely unheard of). > > > How can I get rid of that Flexocard configuration? > > > > I tried > > stty -F /fev/ttyACM0 115200 parenb -parodd -cstopb > > which was used in the old times on /dev/ttyS0. But that did not change > > anything. So it seems to be something with udev?? > > The way it usually works is that the kernel logs events (new device > added, removed, etc.) on a socket and the udev daemon listens on them > and takes any actions (like loading a kernel module, starting a > user space program, changing inode permissions, etc). > > I'll assume this is Debian 11: > > root@Mediondebn:~# udevadm monitor > > monitor will print the received events for: > > UDEV - the event which udev sends out after rule processing > > KERNEL - the kernel uevent > > > > KERNEL[2035.060329] add /devices/pci0000:00/0000:00:14.0/usb1/1-4 > > (usb) KERNEL[2035.067291] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) > > KERNEL[2035.067318] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) > > KERNEL[2035.067352] bind /devices/pci0000:00/0000:00:14.0/usb1/1-4 > > (usb) UDEV [2035.079950] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4 (usb) UDEV [2035.082479] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) > > KERNEL[2035.088880] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) > > KERNEL[2035.088911] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/tty/ttyACM0 (tty) > > KERNEL[2035.088951] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) > > KERNEL[2035.088970] add /bus/usb/drivers/cdc_acm (drivers) > > KERNEL[2035.088983] add /module/cdc_acm (module) > > UDEV [2035.089029] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) UDEV > > [2035.089748] add /bus/usb/drivers/cdc_acm (drivers) > > UDEV [2035.090184] add /module/cdc_acm (module) > > UDEV [2035.093556] bind /devices/pci0000:00/0000:00:14.0/usb1/1-4 > > (usb) UDEV [2035.094826] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) UDEV > > [2035.095798] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/tty/ttyACM0 (tty) UDEV > > [2035.096868] bind /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 > > (usb) > > > > No message on lsof | grep ttyACM > > > > root@Mediondebn:~# stty -a < /dev/ttyACM0 > > speed 9600 baud; rows 0; columns 0; line = 0; > > [...] > > and this Debian 10: > > root@Mediondebn:~# udevadm monitor > > monitor will print the received events for: > > UDEV - the event which udev sends out after rule processing > > KERNEL - the kernel uevent > > > > KERNEL[145.449225] add /devices/pci0000:00/0000:00:14.0/usb1/1-4 > > (usb) > > KERNEL[145.450616] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) > > KERNEL[145.450776] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/tty/ttyACM0 (tty) > > KERNEL[145.450800] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) > > KERNEL[145.450821] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) > > KERNEL[145.450844] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) > > KERNEL[145.450867] bind /devices/pci0000:00/0000:00:14.0/usb1/1-4 > > (usb) UDEV [145.454702] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4 (usb) UDEV [145.455832] add > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0 (usb) UDEV > > [145.456187] add /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 > > (usb) UDEV [145.456878] bind > > /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1 (usb) UDEV
