Garry's Mod

What works

Almost everything:

Singleplayer

Multiplayer (all gamemodes I've tried to far, and that's not a few)

All tools

SWEP's

Addons

Etc...

What does not

Spawn-menu doesn't work unless you hold it down and then press a key, read Ben Sumner's test result to get a fix.

 Graphics options via the game doesn't work, you have to configure the .cfg file yourself since the options automatically will reset to the recommended settings for your system after shutting down Gmod. You could also set -w and -h in startup commands to set the resolution of the game.

Workarounds

What was not tested

Creating a multiplayer server

Hardware tested

Graphics:

• GPU:
• Driver:

Additional Comments

To get the game running good, use Windows 98 compability mode for hl2.exe and run in dx 8.1 by having the "-dxlevel 81" (without quotations) command in startup commands. Gold rating since almost everything works without problems.

If your garry's mod crashes before submitting a bug or commenting on here, here is what you should try:

This should fix any HUD issues you may have: (You may not be able to see certain effects like fire in the game with this)
In steam right click Garry's mod click Properties click "SET LAUNCH OPTIONS..." Enter this:
-dxlevel 81
to run in windowed mode add: -window -h 864 -w 1152

This will stop the crash when being killed by a moving object:
In winecfg (terminal -> winecfg) click Add application on the Applications tab
Browse to Program Files\Steam\steamapps\(username)\garrysmod
select hl2.exe and click Open
With hl2.exe selected in the list change the windows version to Windows 98 (via the drop down box near the bottom is should be default say "Use global settings")
Hit Apply/OK, then try to launch Garry's mod again