Screen not repainting

[ToddAndMargo]

On 04/02/2016 03:55 AM, Ernest Adrogué wrote:
> 2016-03-30, 10:47 (-0700); ToddAndMargo escriu:
>> By chance are you using GLSideshow?  I was and changed to
>> Bouncing Cows and the symptom went away.
>
> No, I run xscreensaver in "blank screen only" mode, and "lock screen" after
> 10 minutes.
>
> It only happens rarely though, maybe last time I saw it was a month ago.

I set time out to 1 minute and bouncing cows.  It took about 50 shots
reproduce.  glsideshow takes about two shots