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TomDenmark
SCSI Port
Posts: 30
Registered: ‎11-02-2019
Location: DK
Views: 739
Message 11 of 49

Re: P1 Gen2 brightness control not working

This problem started again with new Intel Graphics Drivers from 28th Nov 2019. 

pjg
802.11n
Posts: 213
Registered: ‎05-30-2009
Location: CA
Views: 734
Message 12 of 49

Re: P1 Gen2 brightness control not working

Same thing for me. My P1 Gen 2 (Intel only video) no longer has brightness control working with the latest Intel Video driver 26.20.100.752.

 

 

Lenovo Staff
Lenovo Staff
Posts: 6,179
Registered: ‎10-29-2009
Location: NC
Views: 722
Message 13 of 49

Re: P1 Gen2 brightness control not working


@pjg wrote:

Same thing for me. My P1 Gen 2 (Intel only video) no longer has brightness control working with the latest Intel Video driver 26.20.100.752.

 

 


I see the same thing.  I'm so sorry about this.  I have reported this issue to P1 team.  How embarassing for Lenovo to keep having this same issue.

kperelygin
What's DOS?
Posts: 1
Registered: ‎12-02-2019
Location: US
Views: 689
Message 14 of 49

Re: P1 Gen2 brightness control not working

I started seeing the same thing in the past few days (P1 Gen2) - 

Driver Version: 26.21.14.3140*
26.20.100.7529
Operating System: Microsoft Windows 10 Pro 10.0.18363

uhdtv4me
Fanfold Paper
Posts: 15
Registered: ‎06-18-2018
Location: US
Views: 682
Message 15 of 49

Re: P1 Gen2 brightness control not working

Brightness does not work since I've updated to BiOS 1.27 and latest Intel drivers (from Lenovo) were installed.  I had to change to Dedicated in the BiOS and use the NVidia drivers to get brightness control back.  But even with NVidia, it takes a few minutes for the brightness control to be availble - the screen remains dim, as though the screen needs to warm up first.

Even more frustrating is that I cannot install newer Intel drivers. Instead, I keep getting errors that the OS is not compatible.  

fraaw
Paper Tape
Posts: 4
Registered: ‎12-03-2019
Location: IT
Views: 600
Message 16 of 49

Re: P1 Gen2 brightness control not working

Same case.

BIOS: 1.27

Intel Graphic Driver: 26.20.100.7529

Under "Hyrbid" mode brightness functional keys do not work but under "Discrete" mode they function normally.

P1 team please help check and fix the problem. 

echefede
Fanfold Paper
Posts: 6
Registered: ‎12-04-2019
Location: ES
Views: 538
Message 17 of 49

Re: P1 Gen2 brightness control not working

Now, with 1.27 BIOS. Brightness control works on Discrete but doesnt work on Hybrid. 

Lenovo Staff
Lenovo Staff
Posts: 6,179
Registered: ‎10-29-2009
Location: NC
Views: 522
Message 18 of 49

Re: P1 Gen2 brightness control not working

This is a bug in Intel graphics driver 26.20.100.7529.  We have withdrawn this version.

 

Please rollback to previous version here:  https://pcsupport.lenovo.com/ch/en/products/laptops-and-netbooks/thinkpad-x-series-laptops/thinkpad-...

 

Sorry for this trouble.

Akil-X
Paper Tape
Posts: 2
Registered: ‎12-04-2019
Location: IT
Views: 495
Message 19 of 49

Re: P1 Gen2 brightness control not working

Hi, I had the same problem with Windows in one ssd and Ubuntu on the other ssd. After rolling back to the old Windows backup and also downgrading the Intel Graphics driver I'm now able to change the brightness on Windows, but I have no way to do it on Ubuntu. I tried a fresh intall of Ubuntu and Fedora, but the problem persists. I also tried to downgrade the bios from 1.27 to 1.26 and still I have no way to change the brightness on Ubuntu. I also updated the drivers on Ubuntu... no luck. My eyes are hurting with 100% brightness and I have a deadline next week... can somody help me out?

fraaw
Paper Tape
Posts: 4
Registered: ‎12-03-2019
Location: IT
Views: 488
Message 20 of 49

Re: P1 Gen2 brightness control not working

thanks for the reply, unfortunately it still doesnt work with driver ver. 26.20.100.6911 in "Hybrid" mode.

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