Your system information

Processor Information:
CPU Vendor: AuthenticAMD
CPU Brand: AMD A10-5800K APU with Radeon(tm) HD Graphics
CPU Family: 0x15
CPU Model: 0x10
CPU Stepping: 0x1
CPU Type: 0x0
Speed: 3800 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Supported
SSE41: Supported
SSE42: Supported
AES: Supported
AVX: Supported
CMPXCHG16B: Supported
LAHF/SAHF: Supported
PrefetchW: Unsupported

Operating System Version:
Ubuntu 16.04.3 LTS (64 bit)
Kernel Name: Linux
Kernel Version: 4.14.6-041406-generic
X Server Vendor: The X.Org Foundation
X Server Release: 11903000
X Window Manager: Compiz
Steam Runtime Version: steam-runtime-beta-release_2017-10-05

Video Card:
Driver: ATI Technologies Inc. AMD Radeon R9 200 Series
Driver Version: 4.5.13496 Compatibility Profile Context
OpenGL Version: 4.5
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
VendorID: 0x1002
DeviceID: 0x67b1
Revision Not Detected
Number of Monitors: 3
Number of Logical Video Cards: 2
Primary Display Resolution: 1280 x 1024
Desktop Resolution: 3584 x 1024
Primary Display Size: 14.80" x 11.85" (18.94" diag)
37.6cm x 30.1cm (48.1cm diag)
Primary VRAM: 4096 MB

Memory:
RAM: 30165 Mb

• Opted into Steam client beta?: [Yes/No]
  YES
• Have you checked for system updates?: [Yes/No]
  YES

Please describe your issue in as much detail as possible:

Fresh OS Install Ubuntu 16.04.3 LTS (64 bit) + 17.10 (64 bit)
Tried all kernels between 4.10 - 4.14
Steam runs fine using mesa drivers
but as soon as amdgpu-pro-17.40-492261 is installed all hell breaks loose
FPS drop 1/3rd and psychedelic colors in steam

http://steamcommunity.com/profiles/76561197968742271/screenshots/?appid=212070

Also tried disabling the new Shader Pre-Caching option