USB C to HDMI not working


Got a Yoga 920 earlier this week. Plugged my USB C to HDMI adapter in and it worked for a few minutes and than stopped working.

It is now identifying as a USB 2.0 Billboard Device which I belive means it isn’t configuring Displayport Alternative Mode properly.

Here’s what I’ve tried:

Hitting Windows – P to change project mode.

Going into display settings and detect display.

Checking for Updating graphics driver, USB drivers, check for updates.

Using a different USB C to HDMI adapter, a different TV, and a different cable.

Booting to safe mode with no services running.

Any thoughts for reconfiguring the driver?

Comments (6)

6 responses to “USB C to HDMI not working”

  1. jimchamplin

    Welcome to the nightmare that is USB-C, where the only thing you can be certain of is endless headaches because of the lies that surround this connector. It could be that your port doesn't support HDMI out, or perhaps it's your cable. You may never know. USB-C is trash.

    Here's the problem! USB-C is a connector. A physical port. But the protocols that individual jack supports depend on specifications both ridiculous and arcane! You can't even be sure of USB 3.1 data transfer with a USB-C port.

    Every damn USB-C port needs to be labeled "ABANDON ALL HOPE YE WHO ENTER HERE!"

    • Jesse Starr

      In reply to jimchamplin:

      Thanks. It definitely supports HDMI and displayport over Thunderbolt 3. It's a high end brand new laptop, not an older model with a shoddy usb-c port. This is a driver configuration issue within WIndows.

      • jimchamplin

        In reply to Jesse_Starr:

        All fair, but the problem wouldn't be so ridiculous if it weren't for how stupid an idea it is to have one port for everything.

        Good luck though. There's no bigger pain in the rear than inexplicable driver issues.

  2. rameshthanikodi

    this might be a stupid suggestion, but can you try rebooting with the dongle still plugged in? or plugging in the dongle when the machine is off and then powering it on? Also, is the dongle connecting via thunderbolt or USB 3.x? The reason i'm asking this is because Thunderbolt itself is an alternate mode on USB-C, which means if your dongle is using Thunderbolt, it could mean Thunderbolt itself isn't working, you can try verify this by plugging in another Thunderbolt accessory and see if it works. You may need to re-install the Intel Thunderbolt driver.

    If the dongle is connecting via USB 3.x and it still doesn't work, it could mean that Alternate Mode on a whole is f#$%ed.

    If you suspect other driver issues, then first check if Windows's own USB-C driver is loaded (UcmUcsi.sys), you can do this by opening up Device Manager and then looking for "UCSI USB Connector Manager" in the Universal Serial Bus controllers tree.

    It might be worth seeing if has USB-C drivers specific to your machine (you can get the Thunderbolt drivers from there), and then if not, check Windows Update and see if it's surfacing any driver updates, you can use Windows Update Minitool to transparently see which driver update might need to be installed.

  3. yaddamaster

    I've had similar problems - not just with USB-C.

    What usually has cleared up the issue for me (it lasts for days to weeks with no real pattern) is to physically unplug the device being connected. Turning on and off or resetting (tv or monitor) doesn't work. Physically unplugging always seems to reset and it works.

    I thought it was a driver issue as well.....tried everything you described above.

  4. loupio


    Have you found any solution for this ? I have a similar problem. I have updated all the drivers, installed the lastest versions of the BIOS and Firmware. I still have this problem. I just purshased this PC as a second hand device. Don't know what to do!