A month ago, I bought 8 docking stations to pair with brand new Spectre X360 laptops with Intel’s 11th gen Intel Iris Xe graphics.
For the past two weeks since I’ve hooked up these docks, I’ve been experiencing major issues with the second display attached to the dock.
When one monitor is connected, there is no issue. But as soon as a second monitor is connected to the second monitor port, either by HDMI or DisplayPort, the monitor blinks every 15 seconds on average. I recorded a video of this behavior if you would like me to include this.
I have tried with multiple monitors, cables, and different laptops, and I can say with confidence the symptom is not related to a bad thunderbolt or display cables, or other bad hardware.
When I connect the second monitor directly to the thunderbolt port using an active thunderbolt to hdmi adapter, the display works normally, even with the dock connected.
I had a similar issue with a new Dell Inspiron 5406 2-in-1 (also with Intel Iris Xe graphics); however, the issue went away when the graphics driver on Dell’s website was installed.
The Intel Iris Xe driver currently installed on the HP Spectre X360 is 188.8.131.5253. With this driver, the display blinks every 15 seconds. I attempted to update the graphics driver to the latest driver from Intel’s website (184.108.40.20668) released 1/20/2021, but the issue is made even worse. Instead of blinking, there is no display on the second monitor. The monitor is still detected in the Windows display settings, and I can drag windows to the display, but there is no picture out. The monitor simply enters sleep mode.
While I cannot say for certain the cause of the issue, there appears to be some incompatibility between drivers and with the way the dock is handling extracting the two Thunderbolt DisplayPort MST streams. While different products, I have tried using a CalDigit TS3 dock, which contains one DisplayPort output and one Thunderbolt output, and when I use an active adapter on the Thunderbolt output on the CalDigit dock and the DisplayPort output simultaneously, I do not have any issues.