Thanks for that idea. I tried changing from screen blanking to a screen saver but it didn't seem to help. I then tried just restarting X with ctrl-alt-backspace when it had happened, with no help - I still got no display on virtual terminal under F1, and F2 etc had a text terminal until I rebooted. As this has followed me across computers with the shared home dir, I think it must be something in my account - I just really can't think of what user settings would affect X in this way... James Pulver CLASSE Computer Group Cornell University On 09/13/2016 10:48 AM, Howard, Chris wrote: > Sounds like a problem with the screen saver > > Instead of a reboot, you could restart X with a control-alt-backspace > I think. > > But I would investigate changing your screen saver, either > turning it off or making it do something graphical and not > just black out. > > > > > -----Original Message----- > From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of James M. Pulver > Sent: Tuesday, September 13, 2016 8:42 AM > To: [log in to unmask] > Subject: Re: X stopping displaying on SL7.2 > > I have now determined that it seems specific to my turning off the > monitor. If I leave it on even overnight, X keeps working as expected. > The problem is that the monitor is not turned off - so the backlight is > going on a black screen all the time. > > James Pulver > CLASSE Computer Group > Cornell University > > On 09/12/2016 09:27 AM, James M. Pulver wrote: >> Cross posted from serverfault: >> >> I'm having the weirdest issue. We use SL7.2 and have a network home >> directory and AD + SSSD for auth. This means I can go to different >> computers and get a consistent home dir as well as UID/GID etc. I have a >> physical KVM to set up computers more easily. >> >> I started having an issue where my workstation would stop displaying X >> to my monitor. The monitor will say "No Signal" It would work fine until >> I switched away via the KVM to another computer, when I switched back X >> would not display. I could connect via Bomgar and see my X session, it >> was fine. I could ctrl-alt-F3 and the virtual terminal would display, >> but the only way to get X back was to reboot. >> >> I thought it might be the KVM, so I connected the monitor via DVI >> directly to the workstation. No change. >> >> I thought it was an issue with the hardware or the OS install, so I set >> up a brand new Lenovo P510 with a new SL7.2 install. Now it will loose X >> if I just don't use it for a while (I think it's the screen locking?). >> >> I thought it might be the monitor - maybe it's old and loosing signal, >> or the new Display port to DVI adapter can be funky, so I installed a >> brand new BENQ GW2765, connected directly via Display Port to the nVidia >> card (this card only has Display Port connectors - 4x). No change. >> >> However, this last time Bomgar could not show the X session... >> >> So now I'm thinking - it HAS to be software, and it has to be something >> in my configuration. But I don't really even know where to start looking >> - /var/log/messages and /var/log/Xorg.0.log don't show anything that's >> obvious to me. >> >> How can I fix X not coming back? >>