Hi, I have just started experimenting with my new eye one pro on linux. I have installed Argyll CMS 0.7b8 and configured udev according to the installation guidelines. It seems this is sufficient to make the i1 work. I can run dispcal -yl -r and the device is found. Question 1: I have to disconnect the i1 from the usb port after each run and reconnect it before a can perform a second dispcal run. If I try to run a second test without disconnecting, I get an error: dispcal: Error - dispread failed with 'Instrument Access Failed' Checking /proc/bus/usb/devices shows the device disappears after the first run. Is this normal behaviour or is something wrong with my configuration ? Before starting the actual calibration, I first wanted to test the current settings of my Eizo LCD monitor with dispcal -yl -r I had heavily modified the controls on this monitor in the past to match some other screen. The first test gave me some results. I still have to learn how to interpret all these numbers, but that's not a question for this e-mail. I am following the tutorials in the Argyll documentation to do a calibration, which suggests to reset the lcd to factory defaults for a start. So I did. With the factory defaults set, dispcal -yl -r doesn't run succesfully anymore. I allways get this error: Sample read failed due to misread Hit Esc, ^C or Q to give up, any other key to retry: when dispcal tries to read the white test window. When I reduce the brightness of the screen to 50%, the test succeeds. Is this behaviour expected and how do I best deal with it? Thank you in advance, Geert -- Kobalt W.I.T. Web & Information Technology Brusselsesteenweg 152 1850 Grimbergen Tel : +32 479 339 655 Email: info@xxxxxxxxxxxx