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Update README.md: Usage of AMD switchable graphics layer

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jaxl 2021-01-06 18:10:00 +08:00
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README.md
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@ -17,11 +17,11 @@ The AMD Open Source Driver for Vulkan is designed to support the following AMD G
* Radeon™ M200/M300/M400 Series
* Radeon™ RX Vega Series
* Radeon™ RX 5700/5500 Series
* Radeon™ RX 6800 Series
* AMD FirePro™ Workstation Wx000/Wx100/Wx300 Series
* Radeon™ Pro WX x100 Series
* Radeon™ Pro 400/500 Series
* Radeon™ W5700/W5500 Series
* Radeon™ RX 6800 Series
### Operating System Support
The AMD Open Source Driver for Vulkan is designed to support following distros on both the AMDGPU upstream driver stack and the [AMDGPU Pro driver stack](https://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-for-Linux-Release-Notes.aspx):
@ -161,14 +161,6 @@ ninja
### Install Vulkan SDK
You can download and install the SDK package [here](https://vulkan.lunarg.com/sdk/home).
### Uninstall Previously Installed JSON Files
Please make sure all JSON files for AMD GPUs under below folders are uninstalled:
```
/etc/vulkan/icd.d
/usr/share/vulkan/icd.d
```
### Copy Driver and JSON Files
#### Ubuntu
```
@ -182,6 +174,12 @@ sudo cp <vulkandriver_path>/drivers/xgl/builds/Release64/icd/amdvlk64.so /usr/li
sudo cp <vulkandriver_path>/drivers/xgl/builds/Release/icd/amdvlk32.so /usr/lib/
sudo cp <vulkandriver_path>/drivers/AMDVLK/json/Redhat/* /etc/vulkan/icd.d/
```
**NOTE:** To make AMDVLK driver work correctly on system with both AMDVLK and RADV installed, AMD switchable graphics layer needs to be enabled by:
```
sudo ln -s /etc/vulkan/icd.d/amd_icd64.json etc/vulkan/implicit_layer.d/amd_icd64.json
sudo ln -s /etc/vulkan/icd.d/amd_icd32.json etc/vulkan/implicit_layer.d/amd_icd32.json
```
> By default, AMDVLK driver is enabled. You can switch the driver between AMDVLK and RADV by environment variable AMD_VULKAN_ICD = AMDVLK or RADV.
> **Note:** The remaining steps are only required when running the AMDGPU upstream driver stack.