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6 Posts

11-30-2020

Finland

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Ubuntu on P17 Gen 1 - display brightness adjustment

2020-11-30, 9:38 AM

I am running Ubuntu 20.04 on a P17 Gen 1. My configuration is the base model Nvidia T1000 in combination with the UHD screen.

I am unable to adjust the display brightness (the LED backlight level). Note that the keybord brightness buttons work, and the system recognises the brightness level set, but the screen remains at full brightness. I have tried the default OS "nouveau" driver, and a few different versions of the proprietary "nvidia" drivers, but so far, to no avail. Note that packages like "Brightness Controller" which adjust colors in order to imitate brightness adjustment are not a viable option.

Could you please let me know which kernel version and drivers, or potentially extra packages, are required to enable display brightness adjustments? I would prefer manually installing these to installing a full OEM image, but if that's available it would also be an option.

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6 Posts

11-30-2020

Finland

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-12-17, 10:48 AM

Display brightness control works now!

Looking at the logs in 

 /var/log/dpkg.log

I found the following updates that coincided with brightness control working:

linux-firmware:all 1.187.4 1.187.6
linux-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33
linux-image-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33
linux-headers-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33

I assume that the fix is contained in one of these updated packages.

Many thanks for your help!

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886 Posts

07-22-2019

Canada

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-11-30, 16:48 PM

Hi @P17_Ubuntu ,

I'll need to check on the details, there were some brightness control issues on that platform on some panels. I'll go dig - I think there were some fixes that went upstream for them but I'm not sure what the status is and when they will make it into stock Ubuntu.

I can make the OEM image available to you if that's of interest - just PM your email address and I'll get that forwarded (sorry - still not on our website for general download....some wheels move slowly). The downside is that will involve a full re-install, but might be the easiest way to get the fix. 

Mark

 

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6 Posts

11-30-2020

Finland

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-11-30, 17:09 PM

Thanks for the quick reply, I also replied to your message. I may start by installing the OEM image in parallel, see if that works, and then see if it's easier to replicate changes in my current installation, or replicate my environment in the OEM image.

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6 Posts

11-30-2020

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-11-30, 17:11 PM

Thanks for the quick reply, I also replied to your message. I may start by installing the OEM image in parallel, see if that works, and then see if it's easier to replicate changes in my current installation, or replicate my environment in the OEM installation.

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6 Posts

11-30-2020

Finland

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-12-04, 8:26 AM

I have now installed the OEM  image (thank you @Mark_Lenovo   for providing it!), with the included Nvidia software. Unfortunately, it has not resolved the issue: whether I run the laptop in igpu, adaptive ("on demand") or discrete-only mode, the screen backlight brightness cannot not adjusted. As with the standard Ubuntu installation, the onscreen notifications for the brightness level work, but the backlight level remains fixed.

These are the versions currently installed:

Nvidia driver: 450.80.02

Kernel: 5.6.0-1035-oem

Do you know of anyone who manages to run this particular screen with backlight brightness adjustment in Linux? Unfortunately, running the screen at full brightness is really not an ergonomic option.

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236 Posts

12-17-2018

United States of America

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-12-04, 11:37 AM

The UHD display on the P17 is still having issues with backlight we are expecting a update soon from Canonical to fix this issue

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6 Posts

11-30-2020

Finland

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  • Message 7 of 14

Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2020-12-17, 10:48 AM

Display brightness control works now!

Looking at the logs in 

 /var/log/dpkg.log

I found the following updates that coincided with brightness control working:

linux-firmware:all 1.187.4 1.187.6
linux-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33
linux-image-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33
linux-headers-oem-20.04:amd64 5.6.0.1035.31 5.6.0.1036.33

I assume that the fix is contained in one of these updated packages.

Many thanks for your help!

0 person found this solution to be helpful.

This helped me too

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72 Posts

01-15-2018

United States of America

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  • Message 8 of 14

Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2021-01-02, 1:06 AM

Is there an image for Ubuntu to use with the P17?  I just ordered a P17 and the first thing I will do is to set up linux.

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1 Posts

06-04-2021

United States of America

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  • Message 9 of 14

Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2021-06-05, 16:02 PM

Do you have a fix yet? 

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886 Posts

07-22-2019

Canada

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Re:Ubuntu on P17 Gen 1 - display brightness adjustment

2021-06-09, 17:51 PM

Hi @robologic 

 

The fix should be upstream. I'm having trouble tracking down the exact patch for it - but which distro are you using? 

 

Mark

 

 

 

 

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