Comment 4 for bug 417744

It's still very likely a duplicate. The fix (i.e. the change in the source code) is independent of the architecture [1], but you're right that the test kernel is only built for amd64 and I didn't see that before. The fix will probably be incorporated into the ubuntu kernel soon. Bug 412492 will then be closed as "Fix Released" and you should be able to verify that the new kernel also fixes it for you. In the unlikely event that it doesn't, report it here and unduplicate this bug report.

[1]: The fix is to increase a timeout from 3 ms to 5 ms. https://bugs.freedesktop.org/attachment.cgi?id=28751