Public bug reported: 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 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: kernel-graphics-hdmi ** Patch added: "6d59d9eedb5b253591f41af14d196991d36b0c78..14e4a095b29fd290a9b80f6e553adcfcf01672d1.patch" https://bugs.launchpad.net/bugs/1922754/+attachment/5484777/+files/6d59d9eedb5b253591f41af14d196991d36b0c78..14e4a095b29fd290a9b80f6e553adcfcf01672d1.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1922754 Title: Make AMD gpus choose YCbCr420 encoding automatically when required for 4k 60Hz output To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1922754/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
