Alain Spineux wrote: > On Dec 19, 2007 7:09 PM, <centos at 911networks.com> wrote: >> Hi, >> >> I upgraded a Dell C521 from Ubuntu 6.04 to CentOS5.1. The Dell has >> an NVidia 6150 analog video card. The screen is an LG1952Tx. >> >> After the screen blanking goes on, and the screen goes to sleep, >> the screen goes black except for a blue note saying: analog video, >> invalid frequency... >> >> I have installed the NVIDIA-Linux-x86-100.14.19-pkg1. Everything >> works great except for the screen sleep... >> >> Any suggestion of what I should look for? > > Until you get a better advice you can disable "dpms" in /etc/X11/xorg.conf > Go into the machine BIOS and reset it to defaults. I have seen cases where aggressive BIOS settings have triggered this type of behaviour. I have about 150 machines now running CentOS 5.1 from Suse 10.0 using the same driver without issues. On a SUN Ultra 40 with an GeForce 8800 Ultra 768MB card we had an issue due to memory interleaving. Disabling this fixed it. -- James A. Peltier Technical Director, RHCE SCIRF | GrUVi @ Simon Fraser University - Burnaby Campus Phone : 778-782-3610 Fax : 778-782-3045 Mobile : 778-840-6434 E-Mail : jpeltier at cs.sfu.ca Website : http://gruvi.cs.sfu.ca | http://scirf.cs.sfu.ca MSN : subatomic_spam at hotmail.com