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3 Posts

12-13-2020

Switzerland

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X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-13, 15:05 PM

I'm having troubles connect a(ny) screen to the HDMI port of my X1 Carbon 6th Gen. Windows detects the external screen correctly, but the screen stays black and I get an error message: "HDMI Signal error". Rebooting with or without the monitor, reconnecting during operation or restarting the ThunderboltService manually / automatically as indicated here https://forums.lenovo.com/topic/view/1301/4430216 don't help.

 

Funnily, when I press ctrl-alt-delete I get the selection menu displayed on the external monitor. Also when I reboot the system, the message is displayed on the blue screen of the external monitor correctly. I have the problem, when I run the system on ac power without further devices attached. The systems specification are listed below, which to my knowledge are the latest versions of the respective packages.

 

Thanks for your help, Johannes

 

System specifiactions:

 

ThinkPad X1 Carbon 6th
Product number:20KGS05000
Bios version:N23ET75W 1.50

 

Edition    Windows 10 Pro
Version    20H2
Installed on    ‎22.‎07.‎2020
OS build    19042.685
Serial number    *********
Experience    Windows Feature Experience Pack 120.2212.551.0

 

Thunderbolt Firmware Update Utility for Windows 10 (Version 1709 or later) - ThinkPad X1 Carbon (Types: 20KH, 20KG)
17.0.0.12-N23TF22W
16 Jun 2020

 

Intel Thunderbolt Software (Version 17.x) for Windows 10 (1709 and later) - ThinkPad T480, T480s, X1 Carbon Gen 6
17.4.80.550
30 Nov 2020

 

Intel® UHD Graphics 620
27.20.100.8935
28.10.2020

Moderator edit by bananaman: Masked serial number to prevent mischief.

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11 Posts

07-31-2020

Italy

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X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-13, 17:21 PM
Download lenovo vantage from microsoft store and update all your drivers.
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3 Posts

12-13-2020

Switzerland

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Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-14, 6:32 AM

Thanks Pedro. I have Lenovo Vantage and update regulary - not the solution, but maybe the cause?

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6 Posts

12-20-2020

United States of America

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Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-20, 18:29 PM

SAME issue... hope someone can find an answer out there

 

really need hdmi connection for external monitor

 

-----------------------------------------------------------------------------------

Issue:  HDMI output not available

 

    monitor and cable work correctly when connected to another source
    when HDMI cable is connected to monitor, monitor briefly wakes from sleep, screen remains black, goes to sleep
    when HDMI cable is disconnected from monitor, monitor awakes, displays message "Check Video Signal"

 

    Intel Thunderbolt controller not visible in the OS/Device Manager

 

reviewed https://pcsupport.lenovo.com/sk/en/solutions/ht508988

 

no pending Windows updates

 

no pending Lenovo Vantage updates

 

ThinkPad X1 Carbon 6th
Product number:  20KH002KUS
BIOS version:  N23ET75W 1.50 

 

Edition  Windows 10 Pro
Version  1909
Installed on 3/27/2020
OS build 18363.1256

 

Intel UHD Graphics 620
Driver Date:  10/28/2020
Driver Version 27.20.100.8935

 

Intel Thunderbolt Software (Version 17.x) for Windows 10 (1709 and later) - ThinkPad T480, T480s, X1 Carbon Gen 6
n22ta14w    17.4.80.550    30 Nov 2020

 

Thunderbolt Firmware Update Utility for Windows 10 (Version 1709 or later) - ThinkPad X1 Carbon (Types: 20KH, 20KG)
n23th06w    17.0.0.12-N23TF22W    15 Jun 2020

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3 Posts

12-13-2020

Switzerland

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Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-20, 19:49 PM

Hi jfs

I rebooted in safe mode, de-installed monitor and display adapter drivers completely and rebooted again in normal mode. After re-installing all drivers and performing a Windows update, my external monitor works now, even parallel to my docking station with another monitor attached. I hope this procedure works with you too.

Cheers, Johannes

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6 Posts

12-20-2020

United States of America

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Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-21, 0:25 AM

was feeling hopeful after your reply

 

tried the following but no luck... any other thoughts? did I miss something?

 

updated Windows to 20H2
completed additional Windows updates
restarted in safe mode and did uninstall / delete display adapter driver(s), restart safe mode...
until display adapter driver = microsoft basic display adapter
restart normal mode
installed 8935 driver... no HDMI
used intel utility to install 9030 driver... no HDMI

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5478 Posts

04-25-2008

United States of America

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  • Message 7 of 9

Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-21, 1:02 AM
Did you try an emergency reset (small button in pinhole on bottom)?
USB-C: Just cos it fits don't mean it works.
I don't work for Lenovo. I'm a crazy volunteer!
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6 Posts

12-20-2020

United States of America

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Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-21, 15:55 PM

Yes, did the emergency reset... still not working :(

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6 Posts

12-20-2020

United States of America

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  • Message 9 of 9

Re:X1 Carbon 6th Gen HDMI Signal Error with latest Win10Pro, TB FW and UHD Graphics 620 driver versions

2020-12-28, 18:16 PM

Extremely disappointed with Lenovo with this issue

 

At this point, the most likely root of the problem appears to be the Thunderbolt controller

 

as described in Lenovo's critical update article here:  https://support.lenovo.com/us/en/solutions/ht508988-critical-intel-thunderbolt-software-and-firmware-updates-thinkpad

 

my laptop's symptoms are:

Intel Thunderbolt controller not visible in the OS/Device Manager

USB-C or Thunderbolt docking stations not visible or having connectivity problems

HDMI output not available

 

I desperately need a second monitor to work from home.  Buying a new laptop just because of this issue is not an option.

 

For clarification and in addition, while using a Lenovo powered USB-C hub, neither the HDMI nor VGA outputs from the hub work.

 

The Lenovo article referenced above specifically states to call Lenovo support if the recommended solution does not correct the problem.  I spoke with Lenovo hardware division and they said I needed to speak with software.  I spoke with software and had an extended discussion about the problem and what steps I had taken.  The advisor told me that in order to get support for this issue, I would need to pay $69 as my laptop is out of warranty.  I told her that was fine that I'm glad to pay the $69 if the problem can be fixed.  She said "most certainly" that after paying the $69, the technician would be able to fix the problem.  I asked how long it would take, she replied 20-30 minutes.  I told her I was skeptical, because I thought I had pretty much already done all the possible troubleshooting measure.  She again stated that the CAN fix the problem, I just needed to pay the $69.  I told her that's fine, but I'm not paying if they CAN'T fix the problem.  Again she said "without a doubt" they can fix the problem but I needed to pay the $69 first.   Again, I told her I didn't want to pay if they can't fix the problem, she told me "no problem... if the problem can't be fixed you can get a refund."

 

So, of course, I paid the $69 because I was very desperate to get my second monitor up and running, and get back to work.  Well, after more than 2 hours of the tech repeating everything I had already done, the problem is not resolved, I can't do my work, and Lenovo had not refunded my $69.

 

Very disappointed.

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