STR: 1. Launch Settings app 2. "Screen Lock" -> set passcode As video you can see there are some black blocks that renders so weird. If you turn the FPS on you can even see the black blocks show the outdated "buffers" as the second video shows.
With outdated "buffers": http://youtu.be/ReEAeYKmuFs
NI for further dispatching.
Device info (today's master Gecko/Gaia) Build ID 20141224160204 Gaia Revision ab41c35eed35404b632a4841714b81b56364ba32 Gaia Date 2014-12-24 20:22:08 Gecko Revision https://hg.mozilla.org/mozilla-central/rev/2acb12da9813 Gecko Version 37.0a1 Device Name flame Firmware(Release) 4.4.2 Firmware(Incremental) 39 Firmware Date Thu Oct 16 18:19:14 CST 2014 Bootloader L1TC00011880
Black blocks: http://youtu.be/M51fN09BbG8