Do I need USB driver on host for Arria 10 GX dev kit (PCIe)?

Following the instructions in that document, I can make the board visible on PCIe:

$ lspci | grep Altera
a1:00.0 Processing accelerators: Altera Corporation Device 2494 (rev 01)

Also, "aocl install $INTELFPGAOCLSDK/board/a10_ref" successfully compiled source and installed. But diagnose gives:

$ aocl diagnose
--------------------------------------------------------------------
ICD System Diagnostics                                              
--------------------------------------------------------------------
 
Using the following location for ICD installation: 
	/etc/OpenCL/vendors
 
Found 4 icd entry at that location:
	/etc/OpenCL/vendors/Altera.icd
	/etc/OpenCL/vendors/nvidia.icd
	/etc/OpenCL/vendors/Intel_FPGA_SSG_Emulator.icd
	/etc/OpenCL/vendors/intel64.icd
 
the following OpenCL libraries are referenced in the icd files:
	libalteracl.so
	libnvidia-opencl.so.1
	libintelocl_emu.so
	/home/okramer/system_studio_2019/opencl_compilers_and_libraries_18.1.0.013/linux/compiler/lib/intel64_lin/libintelocl.so
 
checking LD_LIBRARY_PATH for registered libraries:
	libalteracl.so was registered on the system at /home/okramer/intelFPGA_pro/19.3/hld/host/linux64/lib
	libnvidia-opencl.so.1 was registered on the system at /usr/lib/x86_64-linux-gnu
	libintelocl_emu.so was registered on the system at /home/okramer/intelFPGA_pro/19.3/hld/host/linux64/lib
	/home/okramer/system_studio_2019/opencl_compilers_and_libraries_18.1.0.013/linux/compiler/lib/intel64_lin/libintelocl.so was registered on the system.
 
Using the following location for fcd installations:
	/opt/Intel/OpenCL/Boards
 
Found 1 fcd entry at that location:
	/opt/Intel/OpenCL/Boards/a10_ref.fcd
 
the following OpenCL libraries are referenced in the fcd files:
	/home/okramer/intelFPGA_pro/19.3/hld/board/a10_ref/linux64/lib/libaltera_a10_ref_mmd.so
 
checking LD_LIBRARY_PATH for registered libraries:
	/home/okramer/intelFPGA_pro/19.3/hld/board/a10_ref/linux64/lib/libaltera_a10_ref_mmd.so was registered on the system.
 
Number of Platforms = 4 
	1. Intel(R) FPGA SDK for OpenCL(TM)                             | Intel(R) Corporation           | OpenCL 1.0 Intel(R) FPGA SDK for OpenCL(TM), Version 19.3
	2. NVIDIA CUDA                                                  | NVIDIA Corporation             | OpenCL 1.2 CUDA 10.1.236      
	3. Intel(R) FPGA Emulation Platform for OpenCL(TM)              | Intel(R) Corporation           | OpenCL 1.0 Intel(R) FPGA SDK for OpenCL(TM), Version 19.2
	4. Intel(R) CPU Runtime for OpenCL(TM) Applications             | Intel(R) Corporation           | OpenCL 2.1 LINUX              
--------------------------------------------------------------------
ICD diagnostics PASSED                                              
--------------------------------------------------------------------
--------------------------------------------------------------------
BSP Diagnostics                                                     
--------------------------------------------------------------------
--------------------------------------------------------------------
Warning:
No devices attached for package:
/home/okramer/intelFPGA_pro/19.3/hld/board/a10_ref
--------------------------------------------------------------------
Vendor: Intel(R) Corporation
 
Found no active device installed on the host machine.
 
Please make sure to: 
      1. Set the environment variable AOCL_BOARD_PACKAGE_ROOT to the correct board package.
      2. Install the driver from the selected board package.
      3. Properly install the device in the host machine.
      4. Configure the device with a supported OpenCL design.
      5. Reboot the machine if the PCI Express link failed.
 
DIAGNOSTIC_FAILED
--------------------------------------------------------------------
 
Call "aocl diagnose <device-names>" to run diagnose for specified devices
Call "aocl diagnose all" to run diagnose for all devices

Specifically, "Warning: No devices attached for package: /home/okramer/intelFPGA_pro/19.3/hld/board/a10_ref" seems like the problem. But I don't know what to do about that. The same issue persisted in this thread. I checked everything that was mentioned in that thread along with other threads referenced, but no luck. The OP said he finally fixed it by moving the board to a different PCI slot. I guess I have to try that (I have a GPU in another slot). Tried that but still get "no device attached" message.