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From: "Ettore Chimenti" <ettore.chimenti@linaro.org>
To: "Sérgio Ferreira" <ferreira@se-rg.io>,
	"Ettore Chimenti" <ettore.chimenti@linaro.org>
Cc: "Bjorn Andersson" <andersson@kernel.org>,
	"Konrad Dybcio" <konradybcio@kernel.org>,
	"Abel Vesa" <abelvesa@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
	"Conor Dooley" <conor+dt@kernel.org>,
	"Linux Arm Msm" <linux-arm-msm@vger.kernel.org>,
	"Devicetree" <devicetree@vger.kernel.org>,
	"Linux Kernel" <linux-kernel@vger.kernel.org>,
	"Georg Gottleuber" <ggo@tuxedocomputers.com>,
	"Ettore Chimenti" <ek5.chimenti@gmail.com>,
	"Jens Glathe" <jens.glathe@oldschoolsolutions.biz>,
	"Srinivas Kandagatla" <srini@kernel.org>
Subject: Re: [PATCH v2] arm64: dts: qcom: x1e80100-medion-sprchrgd-14-s1: Add PWM backlight
Date: Tue, 27 Oct 2026 17:25:21 +0100	[thread overview]
Message-ID: <DMFRE8PRV4MD.3DSSCQVOLZTIP@linaro.org> (raw)
In-Reply-To: <P4tSXlD--F-9@se-rg.io>

Hi Sérgio,

On Mon Oct 26, 2026 at 7:26 PM CET, Sérgio Ferreira wrote:
> Hi Ettore,
>
> thanks for testing.
>
> No, i can not reproduce the value inversion. A brightness of 1 equals very dark while 4095 is maximum brightness. 0 is turning the screen off as expected.
>
> Here is my edid:
>
> ```
> edid-decode /sys/class/drm/card1-eDP-1/edid
> edid-decode (hex):
> ```
[...]

I have the same EDID so the panel is the same. I guess my unit has a
different circuit revision. 

>
> I can confirm the PWM period value mapping is a bit off for the top-end values, though I haven't noticed that in day-to-day use.

I agree, not a big deal indeed, I see other laptops (e.g.
x1p42100-lenovo-thinkbook-16.dts) using the same range.

Tested-by: Ettore Chimenti <ettore.chimenti@linaro.org>

Thanks,
Ettore

  reply	other threads:[~2026-10-27 16:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-25  7:51 Sérgio Ferreira via B4 Relay
2026-10-26 10:00 ` Konrad Dybcio
2026-10-26 17:08 ` Ettore Chimenti
2026-10-26 18:26   ` Sérgio Ferreira
2026-10-27 16:25     ` Ettore Chimenti [this message]
2026-10-28 15:40 ` Abel Vesa

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