I recently updated my G60-630US to Windows 8 .1 as well. The sound worked UNTIL took the memory to 4GB. The machine came with 2. I took it to 3 with no issue then to 4 and boom sound stopped working. If you take the memory back down to 3 or run msconfig and limit the memory to 4096 (which really ends up being 3GB really) then the sound works fine and the sound even works with Microsoft's sound driver even if you uninstall the Conexant Pebble one... I suspect the problem existed even with 7 but I didn't upgrade the memory until I had moved to 8.
Any Idea if there is solution to get work my jack output and the laptop speakers while having 4GB memory?
Thank You