Two fixes for the Dell Inspiron 14 Plus 7441.

Patch 1 gives the eDP panel a PWM backlight. The AUO B140QAX01.H panel
only supports PWM-pin brightness, so the DP AUX fallback registers a
backlight with max_brightness 0 and brightness cannot be changed. The PWM
wiring (PMK8550 gpio5 func3, pmk8550_pwm) matches the HP OmniBook X14.
It goes in the Inspiron DT rather than x1-dell-thena.dtsi, because the
Latitude 7455 was submitted with a different panel and a working
backlight, and only the Inspiron has been tested. The dtsi only gains a
panel label, which leaves the Latitude DTB functionally unchanged. If a
Latitude 7455 owner can confirm the same PWM wiring, this can move to the
dtsi.

Patch 2 moves the touchscreen from 0x10, where nothing responds, to 0x09.
That is where the HID-over-I2C device answers, where the firmware's DSDT
places it on this machine, and where the Latitude 7455 DT already has the
same part.

As far as I know, no Inspiron 14 Plus 7441 has its touchscreen at 0x10.
The original node matches the CRD, XPS 13 9345 and T14s nodes the DT was
based on.

Charlie Garner (2):
  arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: add PWM
    backlight
  arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: fix touchscreen
    i2c address

 arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi   |  2 +-
 .../x1e80100-dell-inspiron-14-plus-7441.dts   | 31 +++++++++++++++++--
 2 files changed, 30 insertions(+), 3 deletions(-)


base-commit: 32afff1e816e10185bb571aa9d89dc2eb061d548
-- 
2.55.0

On Thu, Sep 24, 2026 at 12:55:04AM +0930, Charlie Garner wrote:
> Two fixes for the Dell Inspiron 14 Plus 7441.
> 
> Patch 1 gives the eDP panel a PWM backlight. The AUO B140QAX01.H panel
> only supports PWM-pin brightness, so the DP AUX fallback registers a
> backlight with max_brightness 0 and brightness cannot be changed. The PWM
> wiring (PMK8550 gpio5 func3, pmk8550_pwm) matches the HP OmniBook X14.
> It goes in the Inspiron DT rather than x1-dell-thena.dtsi, because the
> Latitude 7455 was submitted with a different panel and a working
> backlight, and only the Inspiron has been tested. The dtsi only gains a
> panel label, which leaves the Latitude DTB functionally unchanged. If a
> Latitude 7455 owner can confirm the same PWM wiring, this can move to the
> dtsi.
> 
> Patch 2 moves the touchscreen from 0x10, where nothing responds, to 0x09.
> That is where the HID-over-I2C device answers, where the firmware's DSDT
> places it on this machine, and where the Latitude 7455 DT already has the
> same part.
> 
> As far as I know, no Inspiron 14 Plus 7441 has its touchscreen at 0x10.
> The original node matches the CRD, XPS 13 9345 and T14s nodes the DT was
> based on.
> 
> Charlie Garner (2):
>   arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: add PWM
>     backlight
>   arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: fix touchscreen
>     i2c address
> 

Applied

Thank you,
Bjorn

>  arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi   |  2 +-
>  .../x1e80100-dell-inspiron-14-plus-7441.dts   | 31 +++++++++++++++++--
>  2 files changed, 30 insertions(+), 3 deletions(-)
> 
> 
> base-commit: 32afff1e816e10185bb571aa9d89dc2eb061d548
> -- 
> 2.55.0
>

On Thu, 24 Sep 2026 00:55:04 +0930, Charlie Garner wrote:
> Two fixes for the Dell Inspiron 14 Plus 7441.
> 
> Patch 1 gives the eDP panel a PWM backlight. The AUO B140QAX01.H panel
> only supports PWM-pin brightness, so the DP AUX fallback registers a
> backlight with max_brightness 0 and brightness cannot be changed. The PWM
> wiring (PMK8550 gpio5 func3, pmk8550_pwm) matches the HP OmniBook X14.
> It goes in the Inspiron DT rather than x1-dell-thena.dtsi, because the
> Latitude 7455 was submitted with a different panel and a working
> backlight, and only the Inspiron has been tested. The dtsi only gains a
> panel label, which leaves the Latitude DTB functionally unchanged. If a
> Latitude 7455 owner can confirm the same PWM wiring, this can move to the
> dtsi.
> 
> [...]

Applied, thanks!

[1/2] arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: add PWM backlight
      commit: 6f4139020847738d646db0b6589297f71fc0710c
[2/2] arm64: dts: qcom: x1e80100-dell-inspiron-14-plus-7441: fix touchscreen i2c address
      commit: 66de84159065c9c08be4ce17a8c016efa0382121

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>