Nouveau has been broken on NV34 since Dec. 15. The symptom is text missing (not displaying). The patch that caused the problem is commit 69782a57285bb53df73c7f45d29882ae990f6054 I tested by compiling xf86-video-nouveau without the patch (works correctly) and with (broken). The monitor I am using is a DVI-D. I also have a NV4A and the problem does not occur on it.
Fixed by commit 2879f4518e6830cf0b490cde5b4daca3e931383d
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