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4 Posts

04-08-2020

Italy

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Re:P1 Gen2 brightness control not working

2020-04-09, 21:38 PM

I took a look at X1 Extreme forum, there is a more 'scientific' solution for this problem.

Probably the windows update step does exactly the same driver removal operation.

 

https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/problem-with-brightness-control/m-p/5005569

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7 Posts

04-15-2020

United States of America

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Re:P1 Gen2 brightness control not working

2020-04-15, 3:22 AM

Read all 8 pages and didn't see a fix for Linux (Ubuntu 19.10). I have a P1 Gen2 with Intel HUD 630 and Quadro T2000.

 

Anyone get the brightness working?

 

 

 

Linux p1gen2 5.3.0-46-generic #38-Ubuntu SMP Fri Mar 27 17:37:05 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

 

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=19.10

DISTRIB_CODENAME=eoan

DISTRIB_DESCRIPTION="Ubuntu 19.10"

NAME="Ubuntu"

VERSION="19.10 (Eoan Ermine)"

ID=ubuntu

ID_LIKE=debian

PRETTY_NAME="Ubuntu 19.10"

VERSION_ID="19.10"

HOME_URL="https://www.ubuntu.com/"

SUPPORT_URL="https://help.ubuntu.com/"

BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"

PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"

VERSION_CODENAME=eoan

UBUNTU_CODENAME=eoan

 

 

BIOS Information

       Vendor: LENOVO

       Version: N2OET43W (1.30 )

       Release Date: 03/24/2020

       Address: 0xE0000

       Runtime Size: 128 kB

       ROM Size: 32 MB

       Characteristics:

               PCI is supported

               PNP is supported

               BIOS is upgradeable

               BIOS shadowing is allowed

               Boot from CD is supported

               Selectable boot is supported

               EDD is supported

               3.5"/720 kB floppy services are supported (int 13h)

               Print screen service is supported (int 5h)

               8042 keyboard services are supported (int 9h)

               Serial services are supported (int 14h)

               Printer services are supported (int 17h)

               CGA/mono video services are supported (int 10h)

               ACPI is supported

               USB legacy is supported

               BIOS boot specification is supported

               Targeted content distribution is supported

               UEFI is supported

       BIOS Revision: 1.30

       Firmware Revision: 1.22

 

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7 Posts

04-15-2020

United States of America

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Re:P1 Gen2 brightness control not working

2020-04-15, 7:03 AM

After some digging through logfiles and a few posts on Ubuntu forms I have a workaround.  First I need to mention that I have a 4k OLED display and OLED does not have a backlight.  And, for some reason the Linux utilities cannot determine this.  I do wonder if the the BIOS forgets to initialize something because running fwts produces a number of errors in the dmicheck and the autobrightness check.  I want to mention again that I'm on Ubuntu 19.10 with kernel Linux p1gen2 5.3.0-48-generic #41-Ubuntu SMP Fri Apr 10 06:59:18 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux with a P1 Gen2 with 4k OLED display.  

 

 

The range of brightness for a OLED display is between 0.1 and 1.0.  Run the following commands in a terminal on your P1 Gen2 with OLED display:

 

$ sudo xrandr --verbose | grep ' connected ' | cut -f1 -d' '

 

It should return something like this:

 

$ eDP1

 

This is the display which will be used in the next command, first we'll set the display brightness to the lowest setting:

 

$ sudo xrandr --output eDP1 --brightness  0.1

 

This will set the display on the highest setting:

 

$ sudo xrandr --output eDP1 --brightness  1.0

 

A nice comfortable setting for working at night:

 

$ sudo xrandr --output eDP1 --brightness  0.3

 

If you screw up and turn off the display with 0.0 or blast it totally white with 1000 (which is really bright, lol) or some such, quickly type:

 

$ sudo reboot

 

 

If you want to goof around with the different levels, cut and past this in your terminal.  It'll take you from level 0.1 through 0.9, then back to 0.3.

 

echo '#!/bin/bash

 

for level in {1..9}; do

 

 echo "level: 0.$level"

 sudo xrandr --output eDP1 --brightness  0.$level

 sleep 2

 

done

 

echo "level: 0.3"

sudo xrandr --output eDP1 --brightness  0.3' > range.sh && chmod +x ./range.sh && ./range.sh

 

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1 Posts

05-26-2020

United States of America

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Re:P1 Gen2 brightness control not working

2020-05-26, 16:58 PM

Hello, 

 

I received my P1 Gen 2 on 5.21.20 and have noticed the brightness can not be adjusted either. Can someone please provide step by step instructions on the work around? Has Lenovo issued a permanent fix? I am new to Lenovo and disappointed that I am already experiencing issues within the first week. I hope the performance is as good as I had read it to be. 

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2 Posts

06-17-2020

United States of America

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Re:P1 Gen2 brightness control not working

2020-06-28, 8:42 AM

Same here in Germany - got my new X1 Gen2 - trying to follow all your steps - but nothing works - except switch to hybrid graphics

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1 Posts

07-04-2020

Colombia

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  • Message 76 of 86

Re:P1 Gen2 brightness control not working

2020-07-04, 3:06 AM

Hi, another disappointed owner of a brand new P1 gen2. I can´t control brightness and it is extremely annoying my eyes are burning here!!.  Is there a fixed released for this already? I tried all but messing with the BIOS settings. 

 

P1 gen2

BIOS 1.29

Intel Graphics 630 Driver version: 26.20.100.7811

 

Any help is appreciated!

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1 Posts

07-13-2020

United States of America

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  • Message 77 of 86

Re: P1 Gen2 brightness control not working

2020-07-13, 11:36 AM
Where i can get it?
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3 Posts

09-24-2020

United States of America

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  • Message 78 of 86

Re:P1 Gen2 brightness control not working

2020-09-24, 18:01 PM

Hello all,

This was working on Intel driver version 27.20.100.8190.   This morning, without my permission, the driver updated to 27.20.100.8587.  all of the sudden, my screen was lighting up the room with no way for me turn it down.

I tried reverting to the previous driver but something broke in the update.  While I could get the older driver installed, it did not return brightness control functionality.  I reinstalled the new driver just to see if it fixed anything else.  I can't find an advantage and I can't go back.

Intel has a more recent driver on their website.  It is not approved by Lenovo, yet.  Has anyone tried it?  Does anyone have a permanent solution to this recurring problem?

 

Dave

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1 Posts

09-24-2020

United States of America

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  • Message 79 of 86

Re:P1 Gen2 brightness control not working

2020-09-24, 19:20 PM

I just got a brand new Thinkpad P1 G2, and the first thing I noticed was that the brightness would not adjust correctly. I updated to the latest bios and video drivers, but to no effect.

When I called support, they sent someone to my house to replace the screen. After the replacement, the brightness control still did not work.

I changed from the hybrid option to discrete in the bios, and suddenly the brightness controls started working.

When I change back, they stop again. This is obviously an issue that needs addressing.

I found this thread, and I can't believe that an issue such as this has been coming up for so long without properly being addressed.

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3 Posts

09-24-2020

United States of America

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  • Message 80 of 86

Re:P1 Gen2 brightness control not working

2020-09-24, 19:40 PM

I just loaded the latest generic Intel driver from Intel's website, version 27.20.100.8681.  Miraculously, it works!

The latest Lenovo endorsed drivers do not.  This does.  I have brightness control back!

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