[Bug 2084513] Re: Navi24 RX6300 light up issue on 6.8 kernel

** Changed in: linux (Ubuntu)
Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2084513

Title:
Navi24 RX6300 light up issue on 6.8 kernel

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Fix Committed

Bug description:
[Impact]
Navi24 (specific customer SKU of RX6300) had problems with lighting up display on 6.8 kernel.

[Fix]
Mario@AMD looked at issue and it is caused by this commit in 6.8-rc1:

e57cd73f971194e94bc42d57b9fcb184c93a8754 drm/amd/display: Optimize
fast validation cases

It has been fixed by this commit in 6.9-rc1:

f0ec30549a2b ("drm/amd/display: Ensure populate uclk in bb
construction")

[Test]
Boot up the machine with AMD RX6300 gfx, it should display well.

[Where problems could occur]
The patch modifies how optimal DCFCLK (display controller fabric clock) and UCLK (memory clock) values are calculated and paired. This could potentially lead to suboptimal clock settings in some scenarios, especially for low bandwidth cases. The comment mentions this is specifically needed for DCN303 due to low memory bandwidth, but it may have unintended consequences for other configurations.

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