Compared to last month's results, Steam Linux usage dipped slightly to 1.11% from 1.20% the month prior. Ubuntu 14.04 LTS 64-bit lost some ground though Ubuntu 14.04.1 LTS rolled out in this time to reflect the shift, while Linux Mint 17 Qiana gained a little bit.
Still, these survey results aren't too surprise and for over a year have just shown Linux floating around a 1~1.5% market-share on Valve's Steam platform. We don't anticipate any major changes in Linux gaming usage until Steam boxes are out there and SteamOS has further advanced, or there's some compelling reason otherwise for Windows gamers to migrate over to Linux.
The July 2014 Steam Survey results can be found at SteamPowered.com.