06-03-2018 08:26 PM
I recently purchased a Lenovo X1 Carbon Generation 6 laptop, Lenovo Thundebrolt 3 dock and Dell U2717D monitor. Unfortunatly, I am finding that when I connect the monitor to the dock via mini display port OR full size display port, Windows 10 defaults to a 6-bit color pallete resulting in horrendous banding.
Through troubleshooting I have found that:
I've found a few others reporting the sme issue with other Dell monitors but what I have not found is a resolution. Dell has suggested that I try a USB-C to mini Display port cable which I am considering but I'd really hate to throw good money after bad and so am also contemplating a return.
Anyone else out there have this issue? Is there way to force the color depth to 8-bit like it should be all along?
06-05-2018 02:36 AM
Some issue with me. Also using Thunderbolt 3 Dock with two Dell U2717D (DP) external monitors. I am also not able to change to 8-bit-color. Drivers on Dell's site are from 2016 and don't fix the issues either.
Any progress on this issue? Did you contact the Lenovo support? Did you meanwhile test it with another cable?
06-05-2018 02:42 AM
Also updating the docking station firmware with this version does not help:
06-05-2018 03:43 AM
Having the same issue. Can't believe that a business product has such problems with monitor compatibility. And it's a well known brand, Dell! Anyone already opened a ticket at Lenovo? This needs to be fixed, soon!
06-05-2018 06:35 AM
Not really. I attempted to re-install Windows 10 to see if it was a driver/configuration issue on my end but no luck. I'm leaning towards just returning the Dell U2717D monitor and continuing to use my older Dell U2715H monitor which does not have the issue. I don't see a way for me to correct this on my own and its unclear whether the issue is with Lenovo, Dell or Microsoft.
06-27-2018 10:04 AM
I have a 20KH x1c 6th gen connected to the Lenovo Thunderbolt 3 Dock which is connected via DP to Dell U3415W and experiencing colour banding as well. My 5th gen didn't do this with the same setup, only noticed this now with the 6th gen x1c...
Latest firmware and drivers for dock and latest BIOS on 6th gen x1c with latest Intel UHD drivers as well.
08-08-2018 11:26 PM
@all with this problem:
Apperantly it is a driver problem, can you try to roll back the driver to an older version?
Please respond, if this worked or not.
08-08-2018 11:54 PM
I can confirm that downgrading to the old Intel Driver fixes the problem in my case. I have 8-bit-color now.
The driver I am unsing is that one hier: