[Panorama] Mono sound on Ubuntu 18.04

Your system information

System information from steam (Steam -> Help -> System Information) in a gist:


Computer Information:
Manufacturer:  Unknown
Model:  Unknown
Form Factor: Desktop
No Touch Input Detected

Processor Information: CPU Vendor: GenuineIntel CPU Brand: Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz CPU Family: 0x6 CPU Model: 0x2a CPU Stepping: 0x7 CPU Type: 0x0 Speed: 3600 Mhz 4 logical processors 4 physical processors HyperThreading: Unsupported FCMOV: Supported SSE2: Supported SSE3: Supported SSSE3: Supported SSE4a: Unsupported SSE41: Supported SSE42: Supported AES: Supported AVX: Supported CMPXCHG16B: Supported LAHF/SAHF: Supported PrefetchW: Unsupported

Operating System Version: Ubuntu 18.04.1 LTS (64 bit) Kernel Name: Linux Kernel Version: 4.15.0-32-generic X Server Vendor: The X.Org Foundation X Server Release: 11906000 X Window Manager: i3 Steam Runtime Version: steam-runtime-beta-release_2018-06-14

Video Card: Driver: X.Org AMD BARTS (DRM 2.50.0 / 4.15.0-32-generic, LLVM 6.0.0) Driver Version: 3.0 Mesa 18.0.5 OpenGL Version: 3.0 Desktop Color Depth: 24 bits per pixel Monitor Refresh Rate: 60 Hz VendorID: 0x1002 DeviceID: 0x6739 Revision Not Detected Number of Monitors: 1 Number of Logical Video Cards: 2 Primary Display Resolution: 1920 x 1080 Desktop Resolution: 1920 x 1080 Primary Display Size: 21.77" x 12.24" (24.96" diag) 55.3cm x 31.1cm (63.4cm diag) Primary VRAM: 1024 MB

Sound card: Audio device: Realtek ALC892

Memory: RAM: 11991 Mb

Miscellaneous: UI Language: English LANG: en_US.UTF-8 Total Hard Disk Space Available: 936719 Mb Largest Free Hard Disk Block: 356463 Mb VR Headset: None detected

Recent Failure Reports:


* Have you checked for system updates?: [Yes/No] Yes

#### Please describe your issue in as much detail as possible:
Describe what you _expected_ should happen and what _did_ happen. Please link any large pastes as a [Github Gist](https://gist.github.com/).

#### Steps for reproducing this issue:

1. Download Ubuntu
2. Launch the game
3. The game will get stuck on the panorama menu in a "blurred" state and won't let you click anything. You will then notice the sound is only in mono.

Is it a coincidence that releasing the Panoramic UI makes the game unplayable and sound broke at the same time? I think Valve needs to roll back the Panoramic update for Linux.

ValveSoftware / csgo-osx-linux

[Panorama] Mono sound on Ubuntu 18.04 #1784

Your system information