This is as vague as a problem report can be, so here goes nothing. I've been running the SD kernel on my N810 since the first version with working WPA2 version with little trouble. Today, however, was quite different: the screen wouldn't blank. .... After a few minutes I noticed that display of my device was still on. I SSHd to the device and checked if there was anything interesting in kernel log. Nope. I restarted systemui to see if that helped. Nope. I tried running advanced-systemui to see if that helped. Nope....