This commit is causing a patchy line of tiny little squares across one of the
main diagonals on the screen (bottom-left to top-right):

68f6dec32ed5eede361f76c8dbdf897652659baf is the first bad commit
commit 68f6dec32ed5eede361f76c8dbdf897652659baf
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Sun Sep 22 21:45:23 2013 +0200

    r600g: move aux_context and r600_screen_clear_buffer to drivers/radeon

    This will be used in the next commit.

:040000 040000 9aa99663b074853ed4d88a5229ff88dfe2e8a0c4
f55eac99d036675f814a0465bf4c8f1e368054bd M    src