Hello i have nvidia gtx 650 ti boots oc 2gb with 2 monitors and gt 240 for xen emulation .My screen displays random pixels and freeze in random times . I don't found errors in /var/log/syslog and /var/log/kern.log its nouveau error on nvidia-driver works fine . Sometimes its freeze. sometimes there are font errors. uname -a Linux debian 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26) x86_64 GNU/Linux dpkg -l | grep nouveau ii libdrm-nouveau2:amd64 2.4.74-1 amd64 Userspace interface to nouvea -specific kernel DRM services -- runtime ii libdrm-nouveau2:i386 2.4.74-1 i386 Userspace interface to nouvea -specific kernel DRM services -- runtime ii xserver-xorg-video-nouveau 1:1.0.13-3 amd64 X.Org X server -- Nouveau display driver https://mega.nz/#!dBgk0JSY!NiLNiiDN88NyNu9egdSt-RIAz3G5dO6VtSnFGn24Uzc kern.log http://mega.nz/#!ZQw2DAQQ!2OIZ3Lbzp9tF0eETwKxhLjLJg26-r7sg7XgVs7hOeYM vbios.rom https://imgur.com/a/ZHa9h screen shots