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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1922754
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
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the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1922754
Title:
Make AMD gpus choose YCbCr420 encoding automatically when required for
4k 60Hz output
Status in linux package in Ubuntu:
Incomplete
Bug description:
On some setups, while the monitor and the gpu support display modes with
pixel clocks of up to 600MHz, the link encoder might not. This prevents
YCbCr444 and RGB encoding for 4k60Hz, but YCbCr420 encoding might still be
possible. However, which color mode is used is decided before the link
encoder capabilities are checked. This patch fixes the problem by retrying
to find a display mode with YCbCr420 enforced and using it, if it is
valid.
Patch already got accepted upstream for linux-next:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-
next.git/commit/?id=14e4a095b29fd290a9b80f6e553adcfcf01672d1 and
applies without modifications to ubuntu-focal/hwe-5.8
Commit-hash: 14e4a095b29fd290a9b80f6e553adcfcf01672d1
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