xscreensaver's glslideshow fails

[MR]

On Sun, Nov 6, 2016 at 7:58 AM, Liam Proven <lproven at gmail.com> wrote:
>
> On 5 November 2016 at 03:28, MR ZenWiz <mrzenwiz at gmail.com> wrote:
> > Since earlier this week, this has been happening consistently across
> > all three of my Xubuntu 16.04 machines.  The error is this (or similar
> > for my work desktop that has two monitors, both with simimlar errors):
> >
> > glslideshow: root window's visual 0x41 does not support the GLX extension.
> >
> > On my work desktop it's 0x24 (or 0x42 - I forget).
> >
> > Last week this was not happening, but since I updated all my machines, it is.
> >
> > Any suggestions?
>
>
> What graphics chip(s) do the machines have and what device driver(s)
> are they running?
>
The laptop has an nVidia G84GLM Quadro FX 1600M running the nVidia 340 driver.

The desktop has an onboard nvidia controller but it reads as an i915
and is running the i915 driver (nvidia does not recognize this card).

The work desktop is running an nvidia card (not sure which one - I can
verify tomorrw) with the nvidia 367 driver.

Footnote: the laptop seems to have this problem now mainly when the
cover is closed for an extended period of time, like overnight.  It
has been behaving fine all day today.