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5 Posts

06-13-2018

Germany

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Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-22, 8:16 AM

Hello,

 

I purchased my P51 half a year ago with SSD upgrade by the seller directly.

Both Ubuntu installations, 17.10 and 18.04, are not able to handle backlight at all. I tried various boot flags, thinkpad-acpi and xbacklight, but no single approach was able to change the backlight settings in any way.

Another problem is that suspending to RAM (sleep sadly results in the same) often fails. Meaning that the system is not able to recover (black screen, no reaction, but power light on) and I have to perform a hard reset.

 

Struggling with these problems for several months, I am thinking about returning the laptop, to buy another product..

 

Any experiences or comments? I appreciate any help!

 

Specs:

Processor: 1x Intel Core i7-7700HQ Processor (i7-7700HQ)
Memory: 1x 16GBDDR42400
Operating System: Free-DOS()
Hard Drive: 1x 1TB 5400 (+ 2xNVMe SSD; 1x upgrade by seller; 1x upgrade by myself)
Wireless Network: 1x Intel Wireless-AC 8265 2x2 AC
Ports: 1x CS13 Docking
Camera: 1x 720p HD Camera
Graphics: 1x GM107GLM [Quadro M1200 Mobile]
Monitor: 15.6 3840x2160
Included Warranty: 3 Year On-site
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21 Posts

09-13-2017

Canada

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-22, 15:35 PM

These sound like software problems to me. Can I suggest you give Fedora a try, specifically 28. I think it has some enhancement around power management. It *just works* on my Thinkpad (T470), but I don't have discrete graphics.

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37 Posts

04-19-2018

United States of America

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-23, 16:24 PM

Hi,

Have a look through this post. I recall seeing some mentions about backlight and sleep.

Perhaps tweaking the kernel or updating can help in you issues.

 

---- P50 / P70 linux experiences

 

https://forums.lenovo.com/t5/Linux-Discussion/P50-P70-linux-experiences/td-p/2251327

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451 Posts

03-03-2017

Japan

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-24, 23:42 PM

Dear customer,

Which BIOS version are you using on your P51?

Have you ever tried to use Ubuntu 16.04 which ThinkPad P51 certified woth BIOS v1.06?

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5 Posts

06-13-2018

Germany

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-29, 15:39 PM
My previous laptop (T420) also *just worked* using Ubuntu (<17.10 back then). I will consider giving Fedora (28) a try, even though I want to stick to Ubuntu on the long term.
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5 Posts

06-13-2018

Germany

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-06-29, 16:14 PM

I just upgraded to the newest version (1.44). Suspend on the freshly booted system did actually work. However, I do need to see how the system behaves after being 'used' for a while.

 

The backlight issue remains, though. I didn't try 16.04, but I had 17.04 running at some point and - if I remember correctly - changing the display backlight worked back then. However, both, 16.04 and 17.04 are too old for me to use it on an everyday basis.

 

Would it help to boot 16.04/17.04 to gather information?

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5 Posts

12-09-2017

United States of America

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-07-01, 14:47 PM

Hi, I think this is a very common problem for Linux.

And I sugguest to read the following article:

https://wiki.archlinux.org/index.php/Backlight

Though this article is based on archlinux, it may also work for other linux distributions.

 

P.S. archlinuxers are crazy on writing documentations.

 

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5 Posts

06-13-2018

Germany

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-07-01, 18:30 PM

Yes, this is indeed a common issue. However, the common solutions appear not to work in this case.

 

To be more precise, I tried the following command line parameters:

- acpi_backlight unspecified

- acpi_backlight=video

- acpi_backlight=vendor

- acpi_backlight=native

- acpi_backlight=none

 

- acpi_osi=Linux thinkpad-acpi.brightness_enable=1

- acpi_backlight=vendor acpi_osi=Linux thinkpad-acpi.brightness_enable=1

- acpi_osi= thinkpad-acpi.brightness_enable=1

 

The first group of options yielded no devices in /sys/class/backlight, nor did the FN keys result in any visual feedback. The second group produces /sys/class/backlight/thinkpad_screen, but sending values to 'brightness' element of this device did also not produce changes (the file content did not even change). However, the latter approach did result in the FN keys to trigger a system notification that the brightness should change right now (but it does not).

 

Any ideas?

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962 Posts

11-05-2009

United States of America

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-07-30, 17:39 PM

It appears that your P51 model has the nvidia Optimus switching GPU setup. This has been nothing but a pain in the ass to get configured, however 18.04 made it a bit easier. this setup may be the reason that your backlight isnt working, as I had similar issues on my W530

 

do you know if you have the nvidia drivers installed or are using nouveau?


Just a volunteer. Please post your questions in the forum, as I will not reply if they are sent in a personal message.

Yoga 14(20FY): i5-6200U, HD 520 + 940M, 8GB RAM, 256GB SSD, Ubuntu 18.04
Yoga Home 900(27ibu): i7-5500, HD5500 + 940A, 8GB RAM, 500GB HDD, Windows Insider Fast
X1 Tablet (20GH): m7-6Y75, 16GB RAM , 256GB NVMe , Intel® HD Graphics 515
Legion Y530(15ICH): i7-8750H, 32GB RAM, 512GB NVMe + 500GB SSD, UHD 630 + 1050Ti
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5 Posts

12-09-2017

United States of America

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Re: Running Ubuntu 18.04 on P51 (20HJS27B00) leads to several severe problems

2018-08-18, 5:57 AM

Hi, I am only making some comments here and it has nothing to do with the solution.

I installed opensuse 15 with KDE on my thinkpad p51 yesterday.

I found that F5 and F6 handle the backlight well.

By the way ,I am using a nouveau driver.

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