Am 02.11.24 um 17:36 schrieb m. allan noah:

You have made some assumptions here-

I don't see evidence that the port is switched off. This could just as easily 
be the device getting into a state where it no longer talks to the USB, perhaps 
because it was sent a command it does not understand. What does `dmesg` say 
after the calibration is over?

Also, we are not the authors of colord-sane, that comes with colord. Can you 
get it to show you some logging of what it is doing? If you disable or 
uninstall it, does the behavior change?

Much thanks for your valuable info.

Here is what dmesg reports (the first tries are with `systemctl stop 
colord.service`, the later with running `colord`):
[87125.861151] usb 3-6: new high-speed USB device number 18 using xhci_hcd
[87125.989927] usb 3-6: New USB device found, idVendor=05e3, idProduct=0142, 
bcdDevice= 3.02
[87125.989945] usb 3-6: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[98781.386852] usb 3-6: USB disconnect, device number 18
[98796.252134] usb 3-6: new high-speed USB device number 19 using xhci_hcd
[98796.380880] usb 3-6: New USB device found, idVendor=05e3, idProduct=0142, 
bcdDevice= 3.02
[98796.380898] usb 3-6: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[99115.678412] usb 3-6: usbfs: USBDEVFS_CONTROL failed cmd vuescan rqt 64 rq 12 
len 1 ret -110
[99145.886851] usb 3-6: usbfs: USBDEVFS_CONTROL failed cmd vuescan rqt 64 rq 12 
len 1 ret -110
[99189.476695] usb 3-6: USB disconnect, device number 19
[100425.457981] usb 3-6: new high-speed USB device number 20 using xhci_hcd
[100425.586625] usb 3-6: New USB device found, idVendor=05e3, idProduct=0142, 
bcdDevice= 3.02
[100425.586635] usb 3-6: New USB device strings: Mfr=0, Product=0, 
SerialNumber=0
[100515.797474] usb 3-6: reset high-speed USB device number 20 using xhci_hcd
[100515.912152] usb 3-6: device descriptor read/64, error -71
[100516.130134] usb 3-6: device descriptor read/64, error -71
[100516.980086] usb 3-6: USB disconnect, device number 20

-Ulf

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