Description:
Here simple build newest Mesa with last LLVM (yes, it contain already prebuilt newer LLVM from official LLVM APT repo) and new DRM for current Debian.

To build Mesa:

1. You need clone this repository - "git clone https://github.com/serhii-nakon/new_mesa.git";
2. Run docker compose build --no-cache
3. Run docker compose up
4. Install Mesa 32 bit sudo cp -vr mesa32/ /opt/
5. Install Mesa 64 bit sudo cp -vr mesa64/ /opt/
6. Set environment variables into /etc/environment
   

LD_LIBRARY_PATH="/opt/mesa64/lib/x86_64-linux-gnu:/opt/mesa32/lib/i386-linux-gnu:/opt/mesa64/lib/x86_64-linux-gnu/vdpau:/opt/mesa32/lib/i386-linux-gnu/vdpau"
LIBGL_DRIVERS_PATH="/opt/mesa64/lib/x86_64-linux-gnu/dri:/opt/mesa32/lib/i386-linux-gnu/dri"
VK_LAYER_PATH="/opt/mesa64/share/vulkan/explicit_layer.d:/opt/mesa32/share/vulkan/explicit_layer.d:/usr/share/vulkan/explicit_layer.d"
VK_ICD_FILENAMES="/opt/mesa64/share/vulkan/icd.d/radeon_icd.x86_64.json:/opt/mesa32/share/vulkan/icd.d/radeon_icd.i686.json:/opt/mesa64/share/vulkan/icd.d/lvp_icd.x86_64.json:/opt/mesa32/share/vulkan/icd.d/lvp_icd.i686.json"
LIBVA_DRIVERS_PATH="/opt/mesa64/lib/x86_64-linux-gnu/dri:/opt/mesa32/lib/i386-linux-gnu/dri"
#VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay

To install from release:

1. Download archive
2. Extract files (it should contain mesa32 and mesa64 dirs)
3. Install Mesa 32 bit sudo cp -vr mesa32/ /opt/
4. Install Mesa 64 bit sudo cp -vr mesa64/ /opt/
5. Set environment variables into /etc/environment
   

LD_LIBRARY_PATH="/opt/mesa64/lib/x86_64-linux-gnu:/opt/mesa32/lib/i386-linux-gnu:/opt/mesa64/lib/x86_64-linux-gnu/vdpau:/opt/mesa32/lib/i386-linux-gnu/vdpau"
LIBGL_DRIVERS_PATH="/opt/mesa64/lib/x86_64-linux-gnu/dri:/opt/mesa32/lib/i386-linux-gnu/dri"
VK_LAYER_PATH="/opt/mesa64/share/vulkan/explicit_layer.d:/opt/mesa32/share/vulkan/explicit_layer.d:/usr/share/vulkan/explicit_layer.d"
VK_ICD_FILENAMES="/opt/mesa64/share/vulkan/icd.d/radeon_icd.x86_64.json:/opt/mesa32/share/vulkan/icd.d/radeon_icd.i686.json:/opt/mesa64/share/vulkan/icd.d/lvp_icd.x86_64.json:/opt/mesa32/share/vulkan/icd.d/lvp_icd.i686.json"
LIBVA_DRIVERS_PATH="/opt/mesa64/lib/x86_64-linux-gnu/dri:/opt/mesa32/lib/i386-linux-gnu/dri"
#VK_INSTANCE_LAYERS=VK_LAYER_MESA_overlay

To check:

PS: Please remove mesa-vdpau because it will crash applications that use it (like VLC) - it can happen due this Mesa build use newer LLVM but by some reason mesa-vdpau package from Debian repository also try use this newer LLVM and crash due it should try to use older one

1. OpenGL, package mesa-utils - glxinfo | grep OpenGL
2. VA-API, package vainfo - vainfo
3. VDPAU, package vdpauinfo - vdpauinfo
4. Vulkan, package vulkan-tools - vulkaninfo

To uninstall:

1. Remove environment variables from /etc/environment
2. Remove Mesa from /opt/ - rm -rf /opt/mesa32 /opt/mesa64

To fix flatpak packages (it can crash startup):

1. sudo flatpak override --unset-env=LD_LIBRARY_PATH
2. sudo flatpak override --unset-env=LIBGL_DRIVERS_PATH
3. sudo flatpak override --unset-env=VK_LAYER_PATH
4. sudo flatpak override --unset-env=VK_ICD_FILENAMES
5. sudo flatpak override --unset-env=LIBVA_DRIVERS_PATH