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#1 2021-02-25 15:48:51

Padrition
Member
Registered: 2021-02-25
Posts: 1

Lenovo Ideapad L340-15irh can't adjust screen brightness

Tried everything from https://wiki.archlinux.org/index.php/Backlight

Also when I pick option acpi_backlight=native and put brightness all the way down on the booting the screen will go exactly for that level of brightness for a moment.

Also thing that work from that page it xset dpms force off

CPU: Intel i5-9300HF (8) @ 2.400GHz
GPU: NVIDIA GeForce GTX 1650 Mobile / Max-Q

Also can note that KDE plasma installed and kernel is 5.11.1-arch1-1 .

Last edited by Padrition (2021-02-25 15:49:58)

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#2 2021-02-26 19:49:50

mrfaber
Member
Registered: 2016-08-09
Posts: 25

Re: Lenovo Ideapad L340-15irh can't adjust screen brightness

On kernel 5.11.1, I'm also unable to change brightness by writing to

/sys/class/backlight/intel_backlight/brightness

Switching back to the 5.10 LTS kernel gives me back brightness controls.

A colleague suggested DPCD changes as a possible culprit. I've tried the fix suggested in the Wiki but no dice. Both

i915.enable_dpcd_backlight=1

and

=0

do nothing for me.

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#3 2021-03-09 06:55:39

mrfaber
Member
Registered: 2016-08-09
Posts: 25

Re: Lenovo Ideapad L340-15irh can't adjust screen brightness

With at least kernel 5.11.4, the issue is gone for me.

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