On Tuesday 27 Jun 2017 23:22:55 you wrote:
> On Sun, 25 Jun 2017 14:35:34 +0100 Mick <michaelkintz...@gmail.com> said:

> > OK, long backtrace uploaded here:
> > 
> >  https://pastebin.com/xiAUmsin
> > 
> >
> > I see a lot of optimisations in there, probably because I built the
> > packages  with O2.
> 
> ooooh. driver (libdri) is stick on some fence operation of it's own... i'm
> afraid you seem to have hit a driver bug. unless you have enabled in the
> compositor settings under misc "grab server during draw". this can help
> reduce tearing in x... but it could lock out other clients from releasing
> some lock or triggering the fence... :/ this shouldnt really be the case
> but it in theory could be. if you dont have grabs enabled... then its a
> driver bug. :/

Right, just as I was suspecting, this mess started with a xorg drivers and 
mesa update.

'Grab Server during draw' is not enabled.  Anything else not mentioned 
explicitly below is also NOT enabled.  I have the following settings in the 
composer which I'm almost sure are the defaults:

Styles: haven't changed this.
Fast Effects: Enabled only fast composite effects for windows.
Disable Effects: none selected.
Rendering Behavior: Don't composite fullscreen windows, 
Engine: OpenGL, 
   OpenGL options:
     Tear-free updates (VSynced),
     Texture from pixmap,Ass
   Assume swapping method:
     Auto
Misc:
  X Messages:
    Send flush
    Send dump
  Sync:
    Initial draw timeout for newly mapped windows: 0.15sec


Thanks Carsten, I better check if this bug has been reported anywhere.

-- 
Regards,
Mick
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