this is a known issue: #2239
https://github.com/ValveSoftware/steam-for-linux/issues/2239
Please close as DUPLICATE.
PS: there are workarounds already, search the net a little.
As breznak mentions this is expected behavior. Launching with STEAM_FRAME_FORCE_CLOSE=1 will get you the behavior you want.
In windows behavior when the "X" button is clicked on the main window is to close the window, but stay running (minimize to the tray). The window is no longer an option when I press alt-tab.
The current behavior that I am experiencing is when the "X" button is clicked on the main window that window just minimizes (not to the tray). The window is an option when I press alt-tab.
Here is my system information:
Processor Information:
Vendor: GenuineIntel
Speed: 3301 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported
Network Information:
Network Speed:
Operating System Version:
Linux (64 bit)
Kernel Name: Linux
Kernel Version: 3.8.7-1-ck
X Server Vendor: The X.Org Foundation
X Server Release: 11400000
X Window Manager: Openbox
Steam Runtime Version: steam-runtime-release-i386_2013-04-02
Video Card:
Driver: NVIDIA Corporation GeForce 8800 GTS/PCIe/SSE2
Sound card:
Audio device: AV200
Memory:
RAM: 7961 Mb
Miscellaneous:
UI Language: English
LANG: en_US.utf8
Microphone: Not set
Total Hard Disk Space Available: 600769 Mb
Largest Free Hard Disk Block: 401953 Mb
Installed software:
Recent Failure Reports: