Game doesn't start in AwesomeWM. Probably will be the same in some of the other non-desktop environment window managers. Does work with XFCE4 on the same system (although then I have multimonitor issues, but that would be a separate bug).
Game update: AppID 107410 "Arma 3", ProcID 10689, IP 0.0.0.0:0
ERROR: ld.so: object '/home/hegemon/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/hegemon/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/hegemon/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored.
ERROR: ld.so: object '/home/hegemon/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS64): ignored.
Setting breakpad minidump AppID = 107410
Steam_SetMinidumpSteamID: Caching Steam ID: 76561197993593536 [API loaded no]
libpng warning: iCCP: known incorrect sRGB profile
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 42 (X_SetInputFocus)
Serial number of failed request: 354
Current serial number in output stream: 356
Dongle firmware /home/hegemon/.local/share/Steam/linux32/../controller_base/d0ggle.bin loaded, version 1435869091.
AL lib: (EE) alc_cleanup: 1 device not closed
Game removed: AppID 107410 "Arma 3", ProcID 10692