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Update README.md, require linux 5.3+ (#347)

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@ -19,7 +19,7 @@ The AMD Open Source Driver for Vulkan is designed to support the following AMD G
> For Pre-GFX10 GPUs, please use v-2023.Q3.3 or older release.
### Operating System Support
The AMD Open Source Driver for Vulkan is designed to support following distros and versions on both the AMDGPU upstream driver stack and the [AMDGPU Pro driver stack](https://www.amd.com/en/support/kb/release-notes/rn-amdgpu-unified-linux-22-20):
The AMD Open Source Driver for Vulkan is designed to support following distros and versions on both the AMDGPU upstream driver stack and the [AMDGPU Pro driver stack](https://www.amd.com/en/support/linux-drivers):
* Ubuntu 22.04 (amd64 version)
* Ubuntu 20.04 (amd64 version)
* RedHat 8.6 (x86-64 version)
@ -47,8 +47,7 @@ The following features and improvements are planned in future releases (Please r
### Known Issues
* CTS may hang in VK.synchronization.internally_synchronized_objects.pipeline_cache_compute with Linux kernel versions lower than 4.13
* The driver can only work with firmware of ME feature version >= 25 (you can check the version with command "sudo cat /sys/kernel/debug/dri/0/amdgpu_firmware_info"). If you are using upstream stack with GPUs of SI or CI family, you may need to upgrade the kernel to 4.19 or later version and firmware (under /lib/firmware/amdgpu/) to the right version from https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu, and then update ramfs (sudo mkinitramfs -o /boot/initrd.img-\`uname -r\` \`uname -r\` **or** sudo mkinitcpio --generate /boot/initrd.img-\`uname -r\` \`uname -r\`)
* If you are using upstream stack, you may need to upgrade the kernel to 5.3 or later version and firmware (under /lib/firmware/amdgpu/) to the right version from https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/amdgpu, and then update ramfs (sudo mkinitramfs -o /boot/initrd.img-`uname -r` `uname -r` or sudo mkinitcpio --generate /boot/initrd.img-`uname -r` `uname -r`)
* Timeline semaphore is not fully supported in Linux kernel until version 5.5. You can install [Vulkan timeline semaphore layer](https://github.com/KhronosGroup/Vulkan-ExtensionLayer) to enable the extension if you are using earlier version of Linux kernel
@ -59,7 +58,7 @@ The driver is built from source code in five repositories: [LLVM](https://github
For changes to LLVM, you should submit contribution to the [LLVM trunk](https://reviews.llvm.org/). Commits there will be evaluated to merge into the amd-gfx-gpuopen-master branch periodically.
For changes to XGL, LLPC, GPURT and PAL, please [create a pull request](https://help.github.com/articles/creating-a-pull-request/) against the dev branch. After your change is reviewed and if it is accepted, it will be evaluated to merge into the master branch in a subsequent regular promotion.
For changes to XGL, LLPC, GPURT and PAL, please [create a pull request](https://help.github.com/articles/creating-a-pull-request/) against the **dev branch**. After your change is reviewed and if it is accepted, it will be evaluated to merge into the master branch in a subsequent regular promotion.
**IMPORTANT**: By creating a pull request, you agree to allow your contribution to be licensed by the project owners under the terms of the [MIT License](LICENSE.txt).