Sylvain CANOINE wrote: > Could you share your whole Xorg.0.log ? Do you use a custom xorg.conf, or > custom xorg.conf.d files ? Opensource Ati driver, ou proprietary blobs ? Thank you for your interest. I am running CentOS-7 installed from CentOS-7-x86_64-LiveKDE-1503.iso and later upgraded to CentOS-7.2. The only packages I have installed have been from CentOS and Epel repos. I'm sure the ATI Radeon driver is open-source. The Radeon firmware comes from the kernel-firmware package - I don't know if any of that is proprietary? There is no xorg.conf file, I assume this is replaced by /usr/share/X11/xorg.conf.d/* . I'm attaching Xorg.0.log - I don't know if that is allowed here? -- Timothy Murphy gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin