12-02-2019 09:12 AM
Same thing for me. My P1 Gen 2 (Intel only video) no longer has brightness control working with the latest Intel Video driver 220.127.116.112.
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.
12-02-2019 02:02 PM
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.
12-03-2019 07:39 AM
Intel Graphic Driver: 18.104.22.16829
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.
12-04-2019 05:02 AM
This is a bug in Intel graphics driver 22.214.171.12429. We have withdrawn this version.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.
12-04-2019 07:29 AM
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?