OK, bisected and triaged. Yesterday's Mesa 13.0.4 release has nothing to do with this as I have confirmed the same problem exists in Mesa 13.0.3.
Bisection reveals the regression occurred back in October and somehow we didn't notice: ------------------------------------------------------------ revno: 3746 [merge] author: Kevin DuBois <kevin.dub...@canonical.com> committer: Tarmac branch nick: development-branch timestamp: Mon 2016-10-10 07:49:38 +0000 message: nested: optimize fullscreen client surfaces by passing their buffers through the nested server to the host server without composing. (LP: #1262116). Fixes: https://bugs.launchpad.net/bugs/1262116. Approved by Daniel van Vugt, Cemil Azizoglu, mir-ci-bot. ------------------------------------------------------------ Revision 3745 was the last known working. ** Changed in: mesa (Ubuntu) Status: Incomplete => Invalid ** Changed in: mir Status: Confirmed => Triaged ** Changed in: mir/0.25 Status: Confirmed => Won't Fix ** Changed in: mir/0.26 Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1663062 Title: [regression] Software clients of nested servers are all black To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1663062/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs