https://bugzilla.kernel.org/show_bug.cgi?id=43207
--- Comment #8 from Jérôme Glisse glisse@freedesktop.org 2012-05-24 19:13:23 --- Created an attachment (id=73382) --> (https://bugzilla.kernel.org/attachment.cgi?id=73382) Fix backend map
This patch should fix your issue