Hi, I'm having trouble accessing my HP device, wich I had read is the same as X-Rite i1 DisplayPro, unless all my troubles are just because an OEM specific configuration. The installation process was as follows on a Linux Centos 6.4: yum installed the following packages: argyllcms-1.3.5-7.el6.nux.x86_64.rpm dispcalGUI-1.2.7.0-128.1.x86_64.rpm Then I realize argyll was to old, so I download latest release, and unpacked it on /usr/local/ Argyll_V1.5.1_linux_x86_64_bin.tgz Unistalled old argyllcms with: sudo rpm --nodeps -e argyllcms.x86_64 Added new aryll 1.5 binaries to $PATH, and reboot. On reboot dispcalGUI auto detected the new argyll location. Copied 55-Argyll.rules to: /etc/udev/rules.d/55-Argyll.rules /lib/udev/rules.d/55-Argyll.rules Added my user (macbeth) to plugdev group, and reboot. Still I get the following error: $ dispcal -yl -R dispcal: Error - new_disprd() failed with 'Instrument Access Failed' $ lsusb | grep Rite Bus 008 Device 004: ID 0765:5020 X-Rite, Inc. $ sudo chmod 777 -R /dev/bus/usb/008/004 $ sudo chown macbeth:plugdev /dev/bus/usb/008/004 $ ls -l -R /dev/bus/usb /dev/bus/usb/008: total 0 crw-rw-r-- 1 root root 189, 896 Jul 30 18:55 001 crw-rw-r-- 1 root root 189, 897 Jul 30 18:55 002 crw-rw-r-- 1 root root 189, 898 Jul 30 18:55 003 crwxrwxrwx+ 1 macbeth plugdev 189, 899 Jul 31 11:44 004 But still same error dispcal: Error - new_disprd() failed with 'Instrument Access Failed' However the device is correctly listed in dispcalGUI as follows: spotread -? -c listno Set communication port from the following list (default 1) 1 = '/dev/bus/usb/008/004 (Xrite i1 DisplayPro, ColorMunki Display)' But when starting calibration fails on error. What I'm missing here? is just a specific problem with the HP oem version of i1 DisplayPro? Thanks for the Help! -- CONFIDENTIALITY NOTICE: This e-mail message is intended only for the above-mentioned recipient(s). Its content is confidential. If you have received this e-mail by error, please notify us immediately and delete it without making a copy, nor disclosing its content, nor taking any action based thereon. Thank you.