GDM3: blank screen: could this be an LLVM Pipe issue?

[Martin-Éric Racine]

2015-05-15 20:46 GMT+03:00 Martin-Éric Racine <martin-eric.racine at iki.fi>:
> Everything seems to point towards this being caused by LLVM Pipe,
> which should kick in whenever gnome-session is lauched on
> non-accelerated hardware.
>
> Help on how to debug the issue from this particular angle is welcome.

Sure enough, removing libgl1-mesa-dri (which pulls libllvm3.5) at
least made something appear on screen after restarting gdm3:

"Oh no! something has gone wrong. A problem has occurred and the
system can't recover. Please log out and try again. [ Log Out ]"

Now, I'm wondering what differences between LLVM 3.4 and 3.5 could cause this.

Cheers!
Martin-Éric