XPS 15 9570, WD15, screen blanks

I realize this is likely in the wrong forum, but I want to help on the rainbowing issue.

@JacPhys. I as well have an 9570, TB16, and two LG 27UK650 4K monitors (hooked up via DisplayPort and mini-DisplayPort). I was able to resolve the "rainbowing effect" for myself by force upgrading the Intel UHD Display drivers to the latest version. Here is the link at Intel's website I used. Don't go to the link yet; read all the following first.

(DISCLAIMER: I am not a Dell technician and I offer no support or advise. I am only offering the process that worked for me for the rainbowing issue, NOT the 70 second blank out issue which I still have no solution for.)

Be advised, the following is a process I had to make up (tl;dr quick background : 24 years in computer tech), but it works... follow the order exactly:

* go into Device Manager
* go to Display Adapters and find Intel(R) UHD Graphics 630 (these drivers work for both 620 & 630 it seems)
* right-click > Properties
* Driver tab > Uninstall Device > checkmark the box to "delete the driver software for this device"
* click Uninstall
* reboot the system
* let the bad driver reinstall itself (it'll likely take 5-8 minutes and you'll get the rainbowing again)
* go back to Device Manager to the same place and roll back the driver (see below why we have to do this)
* select "For another reason"
* give the reason that it's causing rainbowing (there's a "Tell us more" field to explain)
* click Yes
* now go to the link and click "Get Started"
* it will detect if you need to download the driver detection and ask you top install it
* after installing it, it will detect a newer Intel UHD Driver
* simply download and install, reboot, and the rainbowing *should* go away - it did for me

Regarding roll back after install: you are only given the option to "roll back" if we let the bad driver reinstall. You need "roll back" to stop Windows from continually bringing the bad drivers back in automagically. If you don't roll back and simply uninstall, it's likely the Intel driver detection will fail, thinking the correct drivers are already in place (because Windows). Thus, you must roll back and not uninstall. All make sense?

Good luck!

I noticed that "hibernation" does not cause problems. In my previous message I claimed that the problem occurred "after sleep/hibernate" but I checked my laptop battery options and actually my system never went hibernate. It was always in "sleeping mode". Now, when I allowed the hibernation (you can do it in "Advanced settings" of "Power options") I do not have such "flashes/blinking" etc. I set hibernation 5 min. after sleeping mode, thus I do not know yet if the sleeping still causes "flashes/blinking", I will let you know soon.

Before I change for hibernation I noticed that my screen - after several such "flashes/blinking" events stop working, i.e. the screen on my laptop was frozen like on the picture below

while on external monitor I was able to work. Therefore I disconnected TB16, connected again and everything was fine again. maybe this kind of image will allow Dell technicians to diagnose the problem. I suspect the Intel graphics card and I'm waiting for a new driver.

I checked: "sleep mode" still is an issue (TB16 and XPS 15 9570).

Does it work better now?
I had not check the solution of JBLanders (by the way:JBLanders - great post! Thank you for sharing this with us!), because I had simply no time to spend with installing previous versions of drivers. However in April and May there are some new updates from Dell: for BIOS and ASMedia. The first one, with BIOS version 01_09_01 did not solve the problem of "blinking", however the next one 01_10_01 seems to work. Almost. When I woke up XPS 9570 after "sleep mode" the screen connected to TB16 blinked 5-6 times, but now works fine, without problems.
Maybe we can start to thank Dell team for solving this annoying issue?
I observe the behaviour of my laptop and let you know if the solution is permanent. So: it blinks, but only few times.

PS:

There is also nice app: Dell power manager. Now I can keep my battery 65% charged when it is connected to power line.

After "sleep mode" the screen is blinking 4-5 times but then works without any "blinking".

Well, it blinks. Sometimes it stops, sometimes doesn't. Yesterday I left my laptop connected toTB16 and after a while (1 hour?) I found blue screen with DRIVER_POWER_STATE_FAILURE. If Windows 10 May update doesn't solve the problem I will follow JBLanders advices and install older drivers...

By the way: Intel Driver Support Assistant keeps informing me about new UHD 630 driver, but it is not supported by Dell. This "new" driver is from December 2018...

Has anyone seen any updates from Dell?  I've tried all the steps here and also cannot apply the latest Intel drivers.

For me the screen flashing happens every couple of minutes (although the mouse pointer stays visible).

Thanks.

Solved? After Latest Win 10 update (1903) and BIOS update (1.12.0) it seems to be quite stable.

By the way: website dell.com/support always detects "Intel Chipset Device Software Driver" to be updated. Even if it was updated.

Well...

it is not so stable. Sometimes my XPS 15 9570 freezes, probably like here: XPS 9570 freezing.

All drivers up to date, BIOS 1.15.0 etc.

Once or twice a day, for 5-10 sec - just stops working, frozen desktop. It is not this "blinking issue" as it was in this topic, it's a new one: freeeezing.