Michele: can you reproduce the problem and attach the dmesg output, your /var/log/Xorg.0.log, /var/log/Xorg.0.log.old , and /var/log/gpu-manager.log , please?
Michele: can you reproduce the problem and attach the dmesg output, your /var/log/ Xorg.0. log, /var/log/ Xorg.0. log.old , and /var/log/ gpu-manager. log , please?