When you launch Minecraft and quickly maximize the game while it's launching, the game will not have any sound, it doesn't even appear in the volume mixer when you do this, you have to restart the game to regain sound.
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migrated
kumasasa
After having this issue:
Please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".
migrated
[07:52:00] [Client thread/INFO]: Setting user: Tai
[07:52:00] [Client thread/INFO]: (Session ID is token:7597d97bc9d8473382409235827c074d:5df52d8504c14f67801ca3cfc49ce17b)
[07:52:01] [Client thread/INFO]: LWJGL Version: 2.9.4
[07:52:01] [Client thread/INFO]: Reloading ResourceManager: Default
[07:52:02] [Sound Library Loader/INFO]: Starting up SoundSystem...
[07:52:02] [Thread-6/INFO]: Initializing LWJGL OpenAL
[07:52:02] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
AL lib: (EE) MMDevApiOpenPlayback: Device init failed: 0x80004005
[07:52:02] [Thread-6/ERROR]: Error in class 'LibraryLWJGLOpenAL'
[07:52:02] [Thread-6/ERROR]: Unable to initialize OpenAL. Probable cause: OpenAL not supported.
[07:52:02] [Thread-6/WARN]: ERROR MESSAGE:
[07:52:02] [Thread-6/INFO]: Could not locate OpenAL library.
[07:52:02] [Thread-6/WARN]: STACK TRACE:
[07:52:02] [Thread-6/INFO]: org.lwjgl.openal.AL.create(AL.java:156)
[07:52:02] [Thread-6/INFO]: org.lwjgl.openal.AL.create(AL.java:102)
[07:52:02] [Thread-6/INFO]: org.lwjgl.openal.AL.create(AL.java:206)
[07:52:02] [Thread-6/INFO]: paulscode.sound.libraries.LibraryLWJGLOpenAL.init(LibraryLWJGLOpenAL.java:164)
[07:52:02] [Thread-6/INFO]: paulscode.sound.SoundSystem.CommandNewLibrary(SoundSystem.java:1576)
[07:52:02] [Thread-6/INFO]: paulscode.sound.SoundSystem.CommandQueue(SoundSystem.java:2572)
[07:52:02] [Thread-6/INFO]: paulscode.sound.CommandThread.run(CommandThread.java:121)
[07:52:02] [Sound Library Loader/WARN]: ERROR MESSAGE:
[07:52:02] [Sound Library Loader/INFO]: Could not locate OpenAL library.
[07:52:02] [Sound Library Loader/INFO]: Starting up SoundSystem...
[07:52:03] [Thread-8/INFO]: Switching to No Sound
[07:52:03] [Thread-8/INFO]: (Silent Mode)
[07:52:03] [Sound Library Loader/INFO]: Sound engine started
[07:52:03] [Client thread/INFO]: Created: 512x512 textures-atlas
migrated
There you go, as I mentioned it only happens when I double click the game to maximize it while it's still launching and presenting the Mojang logo.