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?

>