XPS 13 9350, external monitors

Thanks for the info. I'll check out your article.

The DA200 is limited to 2048x1152: http://accessories.ap.dell.com/sna/productdetail.aspx?c=sg&l=en&s=bsd&cs=sgbsd1&sku=470-ABNL

If I want higher resolution, I'll need a different adapter.

This was not the cheapest option ever, but it worked, and I was able to find one locally: https://www.bestbuy.com/site/insignia-usb-type-c-to-hdmi-adapter-white/4480802.p?skuId=4480802

(Are we allowed to post those links here?) Insignia USB-C to HDMI. This works in both Linux and Windows 10. There are some pixel scaling issues in Linux, which are likely not monitor- or adapter-dependent. I think the question there is: can you mix a ~4k display (like the 9350) and a QHD display (2560x1440) without scaling issues, when you move windows between monitors?

So, the root cause of the previous issues was the resolution limit on the DA200.

Update: That adapter did not do 4k @ 60 Hz. I replaced it with a Cable Matters USB-C to DisplayPort cable. I also upgraded the monitor to an LG 27UD69P-W. I can now get 4k at 60 Hz on Linux with no issues.

On Windows, I get 4k at 60 Hz, but I get the screen flickering that has been mentioned on many threads on this forum.

Turning down the WiFi power didn't help.

Using a USB-C to HDMI adapter also didn't help.

Using 5 GHz wireless instead of 2.4 GHz wireless didn't help.

Turning WiFi off didn't help.

I'm using the Intel 7265 WiFi chip.

If you only observe this flickering within Windows, have you verified that your Intel GPU drivers are current?

Third attempt at this post. Yes, they're current.

Second attempt at THIS post.

1.6.1 BIOS update did not affect Linux and did not fix Windows issue.

There is no solution to this issue. Trust me. If you connect one 4k monitor @60hz to an XPS13, you cannot connect a second monitor (or use the built-in display) without experiencing periodic blank screens that last a few seconds. I've tried with both the Cable Matters USB-C to DisplayPort 1.2 cable, and with a TB16 dock. I have an LG 27UD69P.

Well, I disagree to an extent; it works like a charm in Ubuntu. It's a Windows problem, not a hardware problem.I have an LG 27UD69P too and I'm using the built-in display and the external monitor right now, no flickering whatsoever. :)

I have same issue. (xps 9350 with Dell U2718Q). Moved from ubuntu to windows (10 pro). The latest bios and drivers. I think it started after 1803 update, but i'm not sure.

I found that when I lower the refresh rate of the build-in display to 48 Hz, its get much better, but the flickering is still there. When I turn the built-in display off, the flickering on external display stops.

Doesn't matter if using usb-c to displayport cable, or docking station (itec thunderbolt 3 dock)

I was trying to get it fixed by dell support, they replaced my motherboard, but it didn't help. They blamed microsoft and didn't offer any other solution.

Hi,

Thanks for posting here. I will be glad to look into this and assist you.

Could you capture a video of the issue (with the change in refresh rate) and share it via private message so we can have this reviewed with our teams and also share the current version of BIOS, Video driver, registered name and system Service Tag.

To send a private message, please click on the message tab next to your avatar– click “New Message” & search for my Dell username (DCFAdmin) & send a private message with the details requested.

-Farooq

Nearly a year later... I still have this issue. I sent a video to the @DELL-Cares address.

4k @ 60Hz still works fine in Ubuntu; it does not work in Windows 10.