(In reply to Diego Viola from comment #72)
> (In reply to Michel Dänzer from comment #51) 
> > The working hypothesis is that it's a Mesa regression between 18.3 and 19.0,
> > so that makes sense?
> 
> That was a mistake from my part, sorry.
> 
> Setting 'export MESA_EXTENSION_OVERRIDE="-GL_ARB_buffer_storage"' after
> startx still makes xterm work fine even after startx (from a running Xorg
> session).
> 
> Sorry for the confusion.

Replied to the wrong comment, this was supposed to be a reply to #68.