https://bugs.freedesktop.org/show_bug.cgi?id=102013

--- Comment #21 from Michel Dänzer michel@daenzer.net --- (In reply to Ilia Mirkin from comment #20)

does EXA support DRI3?

DRI3 is disabled by default with EXA due to bug 95475 (probably unfixable with the current EXA design).

If not, does disabling DRI3 with glamor "fix" things?

Good question; checking the attachment from comment 19 shows that DRI3 is disabled, so the answer is no.