Verified this new mesa proposed on my end with oem-6.5, looks positive
to launch Firefox with multiple tabs to play videos on YouTube.

[Verification]: HP platform(Under development phase)
AMD R9 PRO 8945HS w/ Radeon 780M Graphics

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  Backport packages for 22.04.4 HWE stack

Status in directx-headers package in Ubuntu:
Status in mesa package in Ubuntu:
Status in rust-bindgen package in Ubuntu:
Status in rust-clang-sys package in Ubuntu:
Status in directx-headers source package in Jammy:
  Fix Committed
Status in mesa source package in Jammy:
  Fix Committed
Status in rust-bindgen source package in Jammy:
Status in rust-clang-sys source package in Jammy:

Bug description:
  The graphics HWE stack from mantic needs to be backported for 22.04.4

  - build-dep of the new Mesa

  - new major release (23.2.x)
  - new HW support, Meteor Lake..

  [Test case]
  We want to cover at least 2-3 different, widely used and already previously 
supported GPU generations from both AMD and Intel which are supported by this 
release, as those are the ones that cover most bases; nouveau users tend to 
switch to the NVIDIA blob after installation. No need to test ancient GPU's 
supported by mesa-amber. And best to focus on the newer generations (~5y and 
newer) as the older ones are less likely to break at this point.
  - AMD: Vega, Navi1x (RX5000*), Navi2x (RX6000*), Navi3x (RX7000*)
  - Intel: gen9 (SKL/APL/KBL/CFL/WHL/CML), gen11 (ICL), gen12 (TGL/RKL/RPL/DG2)

  Install the new packages and run some tests:
  - check that the desktop is still using hw acceleration and hasn't fallen 
back to swrast/llvmpipe
  - run freely available benchmarks that torture the GPU (Unigine 
  - run some games from Steam if possible

  and in each case check that there is no gfx corruption happening or

  Note that upstream releases have already been tested for OpenGL and
  Vulkan conformance by their CI.

  [Where things could go wrong]
  This is a major update of Mesa, there could be regressions but we'll try to 
catch any with testing. And since it shares bugs with mantic, we'd already know 
if there are serious issues. We will backport the final 23.2.x at a later 
stage, the first backport is needed for enabling Intel Meteor Lake.

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