[zeth@Master ~]$ optirun steam
Running Steam on arch rolling 64-bit
STEAM_RUNTIME is enabled automatically

(zenity:2799): Gtk-WARNING **: Theme parsing error: gtk.css:63:28: The :prelight pseudo-class is deprecated. Use :hover instead.

(zenity:2799): Gtk-WARNING **: Theme parsing error: gtk.css:73:35: The :prelight pseudo-class is deprecated. Use :hover instead.
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Installing breakpad exception handler for appid(steam)/version(1468023329)
assert_20160729171039_1.dmp[2928]: Uploading dump (out-of-process)
/tmp/dumps/assert_20160729171039_1.dmp
/home/zeth/.local/share/Steam/steam.sh: line 713: 2925 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"
Installing bootstrap /home/zeth/.local/share/Steam/bootstrap.tar.xz
Reset complete!
Restarting Steam by request...
Running Steam on arch rolling 64-bit
STEAM_RUNTIME has been set by the user to: /home/zeth/.local/share/Steam/ubuntu12_32/steam-runtime
Installing breakpad exception handler for appid(steam)/version(1468023329)
assert_20160729171041_1.dmp[3033]: Uploading dump (out-of-process)
/tmp/dumps/assert_20160729171041_1.dmp
assert_20160729171039_1.dmp[2928]: Finished uploading minidump (out-of-process): success = yes
assert_20160729171039_1.dmp[2928]: response: CrashID=bp-e3c342ac-907f-4fb8-bf20-9040f2160729
assert_20160729171039_1.dmp[2928]: file ''/tmp/dumps/assert_20160729171039_1.dmp'', upload yes: ''CrashID=bp-e3c342ac-907f-4fb8-bf20-9040f2160729''
/home/zeth/.local/share/Steam/steam.sh: line 756: 3030 Segmentation fault (core dumped) $STEAM_DEBUGGER "$STEAMROOT/$STEAMEXEPATH" "$@"
assert_20160729171041_1.dmp[3033]: Finished uploading minidump (out-of-process): success = yes
assert_20160729171041_1.dmp[3033]: response: CrashID=bp-d4516586-d644-4393-bd74-e9db02160729
assert_201607291710