Same here, Arch linux mesa 11, ATI card
Full system info: http://pastebin.com/F4kwUYqg
Steam log
[code]Installing breakpad exception handler for appid(steam)/version(1450127196)
Game update: AppID 373420 "Divinity: Original Sin Enhanced Edition", ProcID 31365, IP 0.0.0.0:0
ERROR: ld.so: object '/home/sergey/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/sergey/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/sergey/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
Setting breakpad minidump AppID = 373420
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198049127007 [API loaded no]
Thread "EoCApp" (356997248)
received signal 11
Call stack:
(0) /usr/lib/libpthread.so.0 : +0x10d60 [0x7f961d29fd60]
/home/sergey/.local/share/Steam/SteamApps/common/Divinity Original Sin Enhanced Edition/runner.sh: line 3: 31367 Ошибка сегментирования (core dumped) LD_LIBRARY_PATH="." ./EoCApp
Game removed: AppID 373420 "Divinity: Original Sin Enhanced Edition", ProcID 31367[/code]