[Bug 2131882] Re: Multiple high bandwidth sinks may fail validation

@mauri,

You had a setup that could readily reproduce this which lead to these
patches. Do you think you can check they help as expected?

Thanks!

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https://bugs.launchpad.net/bugs/2131882

Title:
Multiple high bandwidth sinks may fail validation

Status in linux package in Ubuntu:
New
Status in linux-oem-6.17 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Won't Fix
Status in linux-oem-6.17 source package in Noble:
Fix Committed

Bug description:
When multiple high bandwidth sinks are connected (such as 3 high
resolution monitors connected to a USB4 dock) there may be a need to
use different colorspaces to accomplish a picture on the displays.

This role can be done by a compositor, but in practice mutter doesn't
do it.

Instead changes have been made in amdgpu that can allow progressively
falling back through these combinations if the sink supports it.

- RGB
- YUV422 8bpc (bandwidth efficient)
- YUV422 6bpc (reduced color depth)
- YUV420 (last resort)

This should allow more cases to work properly out of the box.

https://git.kernel.org/torvalds/c/5e76bc677cb7c
https://git.kernel.org/torvalds/c/db291ed1732e0

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