in past months I had a problem with my laptop: HP Spectre x360 Laptop - 15-eb0017nl ( it has 2 thunderbolt ports with type C connector and 1 HDMI connector. Moreover there are 2 graphics cards: an Intel one decidated to the laptop monitor and a Nvidia GeForce for the external monitor). The problem was the following: when I tried to connect the laptop with the external monitor there was no way to make it working. I tried to connect the external monitor in the following ways (and with different monitors): - with thunderbolt (usb-c connector) to DisplayPort directly to the monitor
- with thunderbolt (usb-c connector) to HDMI directly to the monitor
- with thunderbolt (usb-c connector) to VGA directly to the monitor
- with DisplayPort to DisplayPort cable connected to the HP Thunderbolt Docking station 120W (6HP48AA)
- with HDMI to HDMI cable connected to the HP Thunderbolt Docking station 120W (6HP48AA)
without any success. The ONLY way to make the external monitor working was to connect it directly through the HDMI connector of the laptop.
After several attempts with the HP support trying to update several drivers (related to everything) and reinstall also the Operating System the HP service (after almost 10 iterations and 2 months) gave me the solution which I want to share with you.
You need to go to the device manager, then Graphic cards, and choose the one related to the external monitor (in my case the NVIDIA one). Right click, properties, details, GUID class, and take note of the code.
Now enter the REGEDIT and enter the following directory: \HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\
finally choose the folder with the same name of the code you took note befeore, then choose folder 0002 and set the RMEnablePhyRepeater entry to 1 (in my case it was set to 0). Shut down the laptop and switch it on.
actually I have no idea about the meaning of 0000 or 0002 folders and so on, but I'm happy to hear that my post has been useful for someone since I wasted a huge amount of time with HP Support in trying to fix that problem!
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