NAK [OEM-5.10] Re: [SRU] [H/Unstable/OEM-5.10] [PATCH 0/1] Fix screen flickering when two 4K 60Hz monitors are connected to AMD Oland GFX

[Timo Aaltonen]

On 13.5.2021 19.26, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1928361
> 
> [Impact]
> Screen flickers rapidly when two 4K 60Hz monitors are connected to AMD
> Oland GFX.
> 
> [Fix]
> Disable certain power saving feature to keep the performance to output
> two 4K 60Hz monitors.
> 
> [Test]
> Plug two 4K 60Hz and stare at the monitors.
> With the patch applied, no more flickers on the screen.
> 
> [Where problems could occur]
> The GFX clock was restrained for stability on laptops. So if those
> laptops have ability to output to dual 4K 60Hz monitors, the systems can
> become unstable.
> 
> However, Oland is really old chip, those laptops neither have 4K
> LVDS, nor have 4K capable HDMI/DP output.
> 
> Kai-Heng Feng (1):
>    drm/radeon/dpm: Disable sclk switching on Oland when two 4K 60Hz
>      monitors are connected
> 
>   drivers/gpu/drm/radeon/radeon.h    | 1 +
>   drivers/gpu/drm/radeon/radeon_pm.c | 8 ++++++++
>   drivers/gpu/drm/radeon/si_dpm.c    | 3 +++
>   3 files changed, 12 insertions(+)
> 

oem-5.10 got it via 5.10.38

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