Try with CTRL-ALT-F2 (go to the console) and CTRL-ALT-F1 (go back to the X-Window). This may help... suomi On 06/20/2016 03:10 AM, Fred Smith wrote: > Hi all! > > I'm running an up to date Centos-7 on my Acer Aspire One netbook. have > been for, well, ever since C7 was released. > > Just had an event today that also happened 2 or 3 times with earlier > systems installed, but I never pursued it. > > What happens is that suddenly while working away on the desktop the > display suddenly goes black... not black as in turned off, I can see > that the backlight is still on, but no image is displayed. > > Nothing I can do fixes it except a reboot. I've tried CTRL-ALT-BKSP, > CTRL-ALT-DEL, alt+printscreen+r+e+i+s+u+b. none of them do anything > noticeable. > > I've been looking at system logs and don't find anything that gives > me a clue what is going wrong when that happens. > > neither dmesg, /var/log/Xorg*, nor /var/log/messages contins much. I've > tried digging thru "man journalctl" and ultimately reading thru the > output of journalctl with no arguments. > > Can anyone of you provide further hints on what I should be looking > for or at? > > thanks! > > Fred >