Silentarmy not Recognize 2 RX 480 GPU

HI all i have isue now.. After i add more GPU RX 480 silentermy not recognize 2 VGA. i try remove one card like before but it's not work.

Devices on platform "AMD Accelarted Parellel Processing" ; and can not minning 2 cards. I already do the same turorial on github
quangtuyen@quangtuyen-desktop:~/silentarmy$ lspci -v | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480] (rev c7) (prog-if 00 [VGA controller])
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480] (rev c7) (prog-if 00 [VGA controller])
quangtuyen@quangtuyen-desktop:~/silentarmy$ ./silentarmy --list
Devices on platform "AMD Accelerated Parallel Processing":
ID 0: Intel(R) Pentium(R) CPU G3440 @ 3.30GHz

Did you change any driver software when you installed the new cards? It looks like OpenCL only recognizes the AMD CPU platform. What do you see in find /etc/Opencl/vendors ? Do you see your video card platform in the output of clinfo ?

I try re-install all driver agains 2 times.

quangtuyen@quangtuyen-desktop:/etc/OpenCL/vendors$ ls
amdocl32.icd amdocl64.icd

below is result of clinfo :
quangtuyen@quangtuyen-desktop:/etc/OpenCL/vendors$ clinfo
Number of platforms: 1
Platform Profile: FULL_PROFILE
Platform Version: OpenCL 2.0 AMD-APP (1800.8)
Platform Name: AMD Accelerated Parallel Processing
Platform Vendor: Advanced Micro Devices, Inc.
Platform Extensions: cl_khr_icd cl_amd_event_callback cl_amd_offline_devices

Platform Name: AMD Accelerated Parallel Processing
Number of devices: 1
Device Type: CL_DEVICE_TYPE_CPU
Vendor ID: 1002h
Board name:
Max compute units: 2
Max work items dimensions: 3
Max work items[0]: 1024
Max work items[1]: 1024
Max work items[2]: 1024
Max work group size: 1024
Preferred vector width char: 16
Preferred vector width short: 8
Preferred vector width int: 4
Preferred vector width long: 2
Preferred vector width float: 4
Preferred vector width double: 2
Native vector width char: 16
Native vector width short: 8
Native vector width int: 4
Native vector width long: 2
Native vector width float: 4
Native vector width double: 2
Max clock frequency: 3262Mhz
Address bits: 64
Max memory allocation: 2147483648
Image support: Yes
Max number of images read arguments: 128
Max number of images write arguments: 64
Max image 2D width: 8192
Max image 2D height: 8192
Max image 3D width: 2048
Max image 3D height: 2048
Max image 3D depth: 2048
Max samplers within kernel: 16
Max size of kernel argument: 4096
Alignment (bits) of base address: 1024
Minimum alignment (bytes) for any datatype: 128
Single precision floating point capability
Denorms: Yes
Quiet NaNs: Yes
Round to nearest even: Yes
Round to zero: Yes
Round to +ve and infinity: Yes
IEEE754-2008 fused multiply-add: Yes
Cache type: Read/Write
Cache line size: 64
Cache size: 32768
Global memory size: 8312500224
Constant buffer size: 65536
Max number of constant args: 8
Local memory type: Global
Local memory size: 32768
Max pipe arguments: 16
Max pipe active reservations: 16
Max pipe packet size: 2147483648
Max global variable size: 1879048192
Max global variable preferred total size: 1879048192
Max read/write image args: 64
Max on device events: 0
Queue on device max size: 0
Max on device queues: 0
Queue on device preferred size: 0
SVM capabilities:
Coarse grain buffer: No
Fine grain buffer: No
Fine grain system: No
Atomics: No
Preferred platform atomic alignment: 0
Preferred global atomic alignment: 0
Preferred local atomic alignment: 0
Kernel Preferred work group size multiple: 1
Error correction support: 0
Unified memory for Host and Device: 1
Profiling timer resolution: 1
Device endianess: Little
Available: Yes
Compiler available: Yes
Execution capabilities:
Execute OpenCL kernels: Yes
Execute native function: Yes
Queue on Host properties:
Out-of-Order: No
Profiling : Yes
Queue on Device properties:
Out-of-Order: No
Profiling : No
Platform ID: 0x7ff9b066b430
Name: Intel(R) Pentium(R) CPU G3440 @ 3.30GHz
Vendor: GenuineIntel
Device OpenCL C version: OpenCL C 1.2
Driver version: 1800.8 (sse2)
Profile: FULL_PROFILE
Version: OpenCL 1.2 AMD-APP (1800.8)
Extensions: cl_khr_fp64 cl_amd_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_loca l_int32_extended_atomics cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_ext_device_fission cl_amd_devic e_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_media_ops2 cl_amd_popcnt cl_khr_spir cl_khr_gl_event

You appear to only have 1 OpenCL platform installed, and that platform is for the CPU. It looks like the video driver is not properly installed. On my system, the OpenCL graphics driver comes from the AMD Accelerated Parallel Processing (APP) SDK. Do you have that installed?

Do you mean AMD APP SDK driver ?? I already try reinstall it as tutorial from https://github.com/mbevand/silentarmy.

Yes. It looks like something is missing. You might have to reinstall the AMD APP SDK driver and the AMDGPU driver. If you've already done that, you might have to reboot for the drivers to get loaded correctly.

can you show me what kernel you are using ??? i failed to install with kernel 4.4.0-45-generic

Kernel Preferred work group size multiple: 1
Error correction support: 0

$ uname -a
Linux deathscythe 4.8.6-1-ARCH #1 SMP PREEMPT Mon Oct 31 18:51:30 CET 2016 x86_64 GNU/Linux

you are using arch linux ...Thanks.. I wil try reinstall ubuntu. 1 more time the problem here seem is about kernel.