Comment # 4 on bug 101055 from Ilia Mirkin

(In reply to Karl-Johan Karlsson from comment #2)
> You're right, sorry. I'm not entirely clear on the difference. I switched to
> the classic driver, and with that both glxgears and KDE Plasma works.

Clear can get called now with less state set in the driver. Many drivers
weren't ready for this and had to be fixed. Looks like no one has fixed up
i915g for a super-early clear call.