Blanked screen never returns

[MR]

On Thu, Nov 3, 2016 at 8:34 AM, MR <mrzenwiz at gmail.com> wrote:
>
> On Thu, Nov 3, 2016 at 7:36 AM, MR <mrzenwiz at gmail.com> wrote:
> >
> > On Wed, Nov 2, 2016 at 1:04 AM, Amichai Rotman <amichai at iglu.org.il> wrote:
> >>
> >> It seems to be a power management issue with the Graphics Adapter. Searching for the model of the laptop, I found it has an nVidia chip.
> >>
> >> Did you installed the proprietary drivers? Try installing the latest available in the 'Additional Drivers' tab in  Software Sources.
> >
> >
> > On the laptop - no.  I completely forgot about that.  I'll try this weekend when I'll be using it.
> >
> > On the desktop, no - it's running with an ASRock Z97 Pro5 m/b with the onboard video controller.  My config file says that's an nvidia, but lsmod shows an i915 driver, so I don't think that's it.
> >
> > However, last night I installed the nvidia driver, which made no difference so I uninstalled it, and this morning the blanking operation is working again.
> >
> > More to come...
> >
> I was mistaken - the screen didn't go blank, the glslideshow fails
> saying display :0.0 does not support the GLX extension.
>
> I'll have to look that one up.

I could not find anything that appeared to be relevant.  I also ran
the glslideshow from the command line and got the same error.

???