The latest intel drivers has some Issues. Display don't work at all when I use the latest driver. As investigated, CPU usage remains high and display are contantly flickering in background, with no display at all.
BIOS Version: Latest - 0071 - BECFL357.86A.0071.2019.0510.1505
OS: Win 10 1809
Displays: 2x Dell U2414H
Display Connection type: Display over USB-C (MST)
Graphics: Iris Plus 655
Graphics Drivers with Display Issue: Total failure: 22.214.171.12412
Graphics Drivers with Intermittent Display Issue: 126.96.36.19919
Graphics Drivers working fine: 188.8.131.5245
When I revert back to OLD drivers (184.108.40.20645), displays work perfectly well.
With Latest driver, issue exist without MST as well.
Kindly investigate and fix the Issue ASAP. Let me know if you need any logs/dumps from my end. Send me an email if you do so.
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You mentioned that you have 2x Dell U2414H are you using an adapter on the USB-C port or are you using the Daisy Chain on the setup? Please provide more details.
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Sorry, I got busy lately and couldn't followup.
Yes I am using Daisy Chaining to drive the displays (aka MST, mentioned in original post).
Everything works fine on driver version 6345.
Display out gets partial broken on version 6519 and totally broken on 6912.
On 6912, system hangs a lot. So what I do is turn off the displays (power off), then remote in to system (RDP) and remove 6912 drivers, reverting back to stable release - 6345.
Today, I investigated a bit with 6912 version. It turns out that if I disable MST/DaisyChaining (display port 1.2) on the Monitor, 6912 driver works.
But as soon as I enable MST/DaisyChaining (display port 1.2), Issue re-appears.
Same goes for 6519.
Since on version 6912, I can't even login, can you advise how can I collect the logs?
Physical Devices are not properly enumerated in RDP Session, so logging will probably not be OK via RDP Session.
As a workaround, I could disable MST/DaisyChaining while running version 6912, solely to collect logs, but then, the collected logs will not be from NOT OK Scenario. What do you suggest?
I am specifically NOT having these problems with my BE NUC. I am running BIOS 73 (you're on older BIOS 71), Windows 10 1903 and the same 220.127.116.1112 graphics driver. I have a 40" Samsung 4K TV connected as monitor and it works well at 4K@60Hz connected via either HDMI or USB-C.
BTW, I am using new StarTech USB-C-to-HDMI dongle that specifically claims support for both 4K@60Hz and HDR - and delivers! (see this (Amazon) entry for details: https://www.amazon.com/gp/product/B07N8RFW86).
Thanks for the Info.
I updated BIOS to v73 but it didn't help.
As per further investigation, Issue only occurs while using Daisy Chaining / MST on DisplayPort.
Since you are not using this feature, you aren't affected.
You're right; once I put in my MST Hub, the main display, as well as the added monitor, remain disconnected. Removing a monitor from the hub doesn't help; you have to remove the hub completely.