On Sat, Nov 2, 2024 at 10:00 AM Ulf Zibis via sane-devel < [email protected]> wrote:
> > I have the slide scanner "Braun MultiMag SlideScan 6000" here. When I > connect it, the process `colord-sane` is started during its approx. > 3-minute self-calibration, which then disappears again. After that, the > device is no longer listed via `lsusb`, so presumably the USB port is > switched off. During the 3 minutes it is still there: > ... > > I use the VueScan program to use the scanner. If I start it during or > after self-calibration, the scanner is not found > > The only way to connect VueScan to the scanner and then use it is to > connect the scanner to USB only after self-calibration. However, this > obviously prevents the use of colour management. What consequences could > this have? > > In my humble opinion, it should not be the task of the SANE colour > management to switch off USB ports. > Could this be a bug? How can this be prevented? > 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? In addition, I think that you should be able to use color profiles even if you plug the scanner in after self calibration. allan -- "well, I stand up next to a mountain- and I chop it down with the edge of my hand"
