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unreliable HDMI via SC-HTB15 Sound Bar

I bought a NUC7i5BNH for use as a home theater system. It is connected to a Samsung UE40D5000 via a Panasonic SC-HTB15 Sound Bar. The sound bar has two HDMI inputs and one HDMI output. It can switch between the two inputs and will decode audio streams itself.

My problem now is that the HDMI video output is not working under all circumstances. I can see the boot screen just fine, but once Windows 10 comes up, the TV loses the signal. The Windows installation was done today while connected to a normal monitor, using an evaluation version of Windows 10 Enterprise. I've not installed any specific drivers. I did update the BIOS to the latest (BNKBL357.86A) and also checked that the HDMI firmware is up-to-date (it was, at 1.72 as reported by the update tool).

I only installed Windows because that's the supported OS for the NUC. What I had tried first was Ubuntu Ubuntu 16.04.4 LTS with updated kernel (4.13.0-37-generic) and XFree (xorg-hwe-16.04). There the situation is a bit mixed. The desktop comes up fine. Chromium starts. But loading a web page with images causes the screen to go blank. Killing Chromium brings the display back. In Kodi, the main UI is fine. But as in Chromium, once it the UI contains images, the display goes blank and comes back when returning to a screen without images. Not very useful...

I can avoid all of these issues by connecting the NUC directly to the Samsung TV. But then I lose the ability to do audio decoding in the sound bar.

The HDMI cables have worked flawlessly in this setup with some other, older mini computer.

Any suggestions? I can still return the NUC, but I'd prefer to keep it, because it performs better than my older system.

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Community Manager
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Hello pohly

 

 

Thank you for joining the community.

 

 

Could you provide us with the Intel® System Support Utility for Windows* report? Please attach the report to the thread.

 

 

https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility-for-Windows- https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility-for-Windows-

 

 

Regards,

 

Leonardo C.

 

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Please see attached the output of the SSU tool. This was generated while connected directly to the TV.

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Community Manager
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Hello pohly

 

 

Thank you for your response.

 

 

Since you have mentioned that you are able to see the NUC boot screen, could you try to boot the operating system (OS) in safe mode?

 

 

https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode

 

 

Please be aware that the content on that site is not controlled by Intel®. This information is offered for your convenience and should not be viewed as an endorsement by Intel® for the merchants or services offered there.

 

 

Please let us know the outcome.

 

 

Regards,

 

Leonardo C.

 

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I booted into safe mode while connected directly to the TV. Then I swapped cables. The display is still visible despite going through the sound bar.

Just to be sure, I repeated the cable swapping exercise while booting normally: then the display is not visible after swapping cables.

This shows that this issue is caused by software. I'm suspecting the HDCP handshake. I don't need content protection, all my media will be without digital restrictions. Is there a way to turn off just HDCP?

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Community Manager
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Hello pohly

 

 

Thank you for your response.

 

 

We can try to delete the video and audio drivers

 

 

Please follow the steps below to uninstall the graphics driver:
  1. On the keyboard, press WinLogo key + R, then type in devmgmt.msc
  2. Expand the Display Adapters section.
  3. Find the Intel® Graphics Driver. The driver can also be called the Intel® Graphics Media Accelerator Driver (Intel® GMA Driver).
  4. Right-click the Intel Graphics Driver and select Uninstall.
  5. Select the checkbox to delete the driver software for this device.
  6. Reboot the computer after the uninstall process has finished.

 

Follow the same steps to uninstall the audio drivers.

 

 

Once these have been done try to manual install the audio and graphics drivers

 

 

Please follow these steps in order to update the graphics driver:
  1. Download the graphics driver ZIP file: https://downloadmirror.intel.com/27484/a08/win64_15.65.4.4944.zip https://downloadmirror.intel.com/27484/a08/win64_15.65.4.4944.zip
  2. Unzip the file to a designated location or folder.
  3. Right-click Windows Start icon and open Device Manager.
  4. Click "Yes" when prompted for permission from User Account Control.
  5. Expand the Display adapters section.
  6. Right-click the Intel® graphics entry and select Update Driver Software.
  7. Click "Browse my computer for driver software".
  8. Click "Let me pick from a list of device drivers on my computer".
  9. Click "Have Disk".
  10. Click "Browse".
  11. Access the designated location or folder, and access a folder called "Graphics".
  12. Select the file called "igdlh64" or "igdlh".
  13. Click Open, then click OK, and finally click "Next". Drivers are now being installed.
  14. Reboot your computer.

 

Please follow these steps in order to update the graphics driver:

 

  1. Download the audio driver for your desktop: https://downloadmirror.intel.com/27126/eng/AUD_Win7_8.1_10_64_6.0.1.8192.zip https://downloadmirror.intel.com/27126/eng/AUD_Win7_8.1_10_64_6.0.1.8192.zip
  2. Double-click the file name to extract the files.
  3. Go to the folder where the files are extracted and browse to the \HDAQFE\xpsp2\us\ folder, or the \MSHDQFE\Win2K_XP\us\ folder. The name of this folder depends on your desktop board model.
  4. Double-click the file kb888111xpsp2.exe to install the High Definition Audio Driver Package.
  5. Restart Windows.
  6. Install the audio driver.

 

Please complete the driver installation without internet connection to avoid the automatic Windows updates.

 

 

Regards,

 

Leonardo C.

 

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After uninstalling the Intel drivers, HDMI via the Sound Bar works fine.

After reinstalling the drivers, the original problem is back.

So it must be something that the driver is doing (or not doing) which causes the loss of connection.

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Community Manager
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Hello pohly

 

 

Thank you for your response.

 

 

Could you try to uninstall the graphics drivers and manually install the following version of graphics drivers?

 

 

https://downloadmirror.intel.com/27412/a08/win64_15.60.2.4901.zip https://downloadmirror.intel.com/27412/a08/win64_15.60.2.4901.zip

 

 

For the installation please follow the steps provided in the previous post.

 

 

Please let us know the outcome.

 

 

Regards,

 

Leonardo C.

 

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Community Manager
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Hello pohly

 

 

Thank you for your response and for letting us know the outcome, allow us to do more research on the case in the meantime could you review your private inbox.

 

 

Regards,

 

Leonardo C.

 

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Community Manager
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Hello pohly

 

 

Thank you for your response, and the information provided, allow us to investigate the situation, we will be posting back as soon as news become available.

 

 

Regards,

 

Leonardo C.

 

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Community Manager
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Hello pohly

 

 

Thank you for your response.

 

 

Allow me to share with you that we have tested your configuration on our lab and we did not face the problems that you have, at this point y recommend contacting Panasonic for assistance on the sound bar.

 

 

PS: please accept our apologies for the delay completing the test.

 

 

Regards,

 

Leonardo C.

 

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