ACK: [PATCH v2 0/1] [SRU][H] UBUNTU: SAUCE: Fix backlight control on Samsung 16727 panel

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 8/2/21 3:14 AM, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/1930527
> 
> [Impact]
> Backlight can't be controlled on 5.11- version of kernel.
> 
> [Fix]
> The panel needs DPCD to get control of backlight on 5.11- kernel.
> After 5.12 kernel introduced new Intel HDR backlight control, and it
> works well on this panel.
> Add quirk ID to enable DPCD on 5.11- kernel.
> 
> Because upstream kernel already got a fix, this patch is not going
> to linus's tree. it's only for 5.11- stable kernel.
> This patch had been submitted to stable kernel twice, and got Acked
> by maintainer too. But still not applied.
> 
> Regression:
> It adds ID to use DPCD AUX control, it should be safe as UBUNTU SAUCE patch
> for other panels.
> 
> [Test]
> Vendor Verified on hardware, with this quirk backlight can be changed on
> 5.11 kernel.
> 
> [Where problems could occur]
> The panel backlight may not be changed.
> 
> Aaron Ma (1):
>    UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Samsung 16727
>      panel
> 
>   drivers/gpu/drm/drm_dp_helper.c | 1 +
>   1 file changed, 1 insertion(+)
> 

-- 
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Tim Gardner
Canonical, Inc