Lenovo legion linux brightness

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Screen brightness stuck at 100% on Lenovo Legion 7i

Screen brightness stuck at 100% on Lenovo Legion 7i

Post by Elie666 » Fri Aug 14, 2020 8:56 pm

I got the Lenovo Legion 7i last week. I installed Mint on it. Most things work great, except the screen brightness. I can’t control it and it’s stuck at 100%.

I tried to edit xorg.conf and add

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by jamiemint » Mon Aug 17, 2020 10:11 pm

A few weeks ago, I accidentally turned my brightness down to zero! I couldn’t get it back! I ended up editing the file that holds the actual brightness setting, which is at /sys/class/backlight/acpi_video0/brightness. Some systems (like mine) may have it in a slightly different place. The value can be from 0 to something like 15, 20 or 24.

Try typing in the terminal:

If it works, the effect is immediate.

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by jamiemint » Mon Aug 17, 2020 10:29 pm

After thinking about it, you probably don’t want to get so «down and dirty» with the hardware.

A better option might be to install the program, brightnessctl, which should allow you to change the brightness on your laptop.

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by Elie666 » Thu Aug 20, 2020 12:50 pm

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by Pjotr » Thu Aug 20, 2020 12:53 pm

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by Elie666 » Fri Aug 21, 2020 8:34 pm

Re: Screen brightness stuck at 100% on Lenovo Legion 7i

Post by jamiemint » Sun Aug 23, 2020 2:11 pm

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Lenovo legion linux brightness

Hi. It has been a few days since I been trying to solve this. I have read a lot and all solution seems to work with 5 Pro, but not with my laptop version.

Current solution for 5 Pro (and probably older generation of 5) is to add «amdgpu.backlight=0» to kernel parameter, but no success for me and a few others of owner of the same laptop.

Here I attached the output of `journalctl -b`. Hopefully someone with the skills an knowledge can help me.

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Re:Legion 5-15ACH6H cannot change brightness in Linux with intergrated Radeon graphic

There is a Linux forum here, you might get better help there. Sorry I do not have idea about Linux.

United States of America

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Re:Legion 5-15ACH6H cannot change brightness in Linux with intergrated Radeon graphic

Welcome to the Community Forums.

Kindly try posting this in our Linux boards for assistance from other Linux enthusiasts.

Hope this helps.
Regards,
Jack_Lenovo1

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If you find a post helpful and it answers your question, please mark it as an «Accepted Solution» ! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

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Re:Legion 5-15ACH6H cannot change brightness in Linux with intergrated Radeon graphic

Thanks you rockykoston and Jack_Lenovo1. It is my first time here and I wasn’t aware.

Reposted at https://forums.lenovo.com/t5/Other-Linux-Discussions/Legion-5-15ACH6H-cannot-change-brightness-in-Linux-with-intergrated-Radeon-graphic/m-p/5084243

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Re:Legion 5-15ACH6H cannot change brightness in Linux with intergrated Radeon graphic

Sorry for the late reply.

That’s no problem. Hopefully another Linux expert can check the post for you.

Did someone help you today? Press the thumbs-up icon below to thank them. !
If you find a post helpful and it answers your question, please mark it as an «Accepted Solution» ! This will help the rest of the Community with similar issues identify the verified solution and benefit from it.

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Lenovo legion linux brightness

I got my Legion Y740 working on Arch Linux, the only issue is the brightness control. The function keys changes the values of /sys/class/backlight/intel_backlight and /sys/class/backlight/ideapad.

I’m currently using the kernel boot parameters acpi_backlight=vendor. I tried several combinations from https://wiki.ubuntu.com/Kernel/Debugging/Backlight but none worked.

The only workarround is using «xrandr —output eDP-1 —brightness 0.5» but that does not work under wayland (Gnome), only on X.

The GPU is Nvidia RTX 2070, but it’s off using bumblebee.

Anyone got the brightness control working on this or a similar model?

Thanks in advance

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Re: Linux on Legion Y740 — no brightness/backlight control

Just want to share this with other people who like me search for this issue with no luck.

I had same issue with Y740 RTX 2060 BIOS v1.06.

After hundreds of searches and dozens trials the only way I found to fix this, is to set BIOS setting to use descrete graphics only.

With this option brightness works out of the box.

You probably will have other issues thou like:

video crash on clean linux install (so need to install with intel card and switch BIOS after propritary nvidia drivers install),

xorg crash on login with Gnome (switch to KDE or make X11 run as root),

wrong DPI in KDE (simple fix in xorg config).

So I think currently with Y740 we have only two options:

1. use switchable graphics intel/nvidia with full backlight and xrandr brightness hack

2. use nvidia only.

And wait kernel/drivers update to make it work in any case.

Hong Kong S.A.R of China

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Re: Linux on Legion Y740 — no brightness/backlight control

Thanks for the feedback! I am currently using Y740 and I encountered the similar issue. I have been finding similar solution for a few days. Regarding your comment, may I ask for a bit clarity? (It may help with my own case)

1. you mention setting «discrete graphics» in BIOS can enable brightness adjustment, but introduces other issues, such as video crash on clean linux install. Can you elaborate more on the video crash issue and how to settle that? I think I encountered similar issue by the time I tried to install nvidia driver in my Ubuntu 16.04

2. you also mention other issue about xorg, such as xorg crash on login with Gnome. Can you also elaborate more on that?

And about waiting for the kernel / driver update, do you mean we have to wait for a Ubuntu kernel update / nvidia driver update to make it compatable with my Y740?

[SUPPLEMENT]

I would like to further elaborate my intention: ultimately I want to make a dual boot on my Y740 (Ubuntu 16.04 + Windows 10). I managed to install Ubuntu 16.04 on fresh but failed to install proprietary nvidia driver in many attempts (attempt including blacklist nouveau, changing BIOS configuration, installing nvidia driver in different way, changing the conf of grub . etc). So I am looking for a solution to installing a proprietary nvidia driver in my Y740. If any Y740 user encountered similar issue and have settled it. I really look forward to your work-around!

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