Monitor Experiences Intermittent Blanking when Connected to Dell Docking Stations
Learn what to do when monitors connected to Dell docking stations experience blanking when using an HDMI, USB Type-C, or DisplayPort output.
Shrnutí:Learn what to do when monitors connected to Dell docking stations experience blanking when using an HDMI, USB Type-C, or DisplayPort output.
Tento článek byl zřejmě přeložen automaticky. Máte-li připomínky k jeho kvalitě, informujte nás pomocí formuláře ve spodní části stránky.
Obsah článku
Příznaky
A monitor may experience intermittently going black (blanking) when connected to a Dell docking station using HDMI, USB Type-C, or DisplayPort (DP) output. This is not limited to Dell branded monitors. This issue may also be reported on third-party monitors.
Příčina
There are several possible causes and solutions that you can try:
Check your cables. Confirm that your cables are properly connected and securely plugged in. Loose connections can cause intermittent blanking.
Outdated drivers can cause compatibility issues and intermittent blanking. Ensure you are on the latest graphics driver for the attached device and dock model.
Check the Drivers & Downloads page from the Support Site for the monitor model for any recent firmware updates.
If the external monitor continues to intermittently blank out for 3 to 4 seconds, this may be a result of Display Stream Compression (DSC) being enabled.
Řešení
Updating the Dell Dock WD19 or Dell Thunderbolt Dock WD22TB4 to firmware version 01.00.36, 01.00.20 or later resolves the issue.
Note: Some Dell computers have DSC enabled from the factory. If using one of these computers, you must ensure that the dock firmware is updated for the computer to have full external monitor support. These computers are:
Once the firmware update is installed on the docking station, you can Manually Enable DSC Using the Registry Key. Alternatively, Dell will roll back the DSC change in a future update to the video driver, enabling DSC by default.
A video driver workaround was previously implemented. For more information about the limitations and changes from the driver workaround, reference Resolution Changes. Users may observe different resolution support after applying this workaround when connecting to certain docks. For more information about Display Stream Compression (DSC), reference What is Display Stream Compression?
Manually Enable DSC Using the Registry Key
Caution: If done incorrectly, modifying the Windows Registry can lead to data loss or operating system corruption. Dell Technologies recommends that you back up data before proceeding with any Windows Registry edit. It is also recommended that a full backup of the Windows Registry is made before starting the edit. See How to Modify the Windows Registry for additional information.
Display Stream Compression can reduce the bandwidth required to transmit high-resolution video signals by compressing the video signal to reduce the amount of data that must be transmitted without compromising the image quality.
When DSC is enabled, the compression ratio varies depending on the resolution and refresh rate of the video signal being transmitted. In general, higher resolutions and refresh rates require higher compression ratios to maintain the same level of image quality. As a result, enabling DSC can increase the maximum resolution and refresh rate that can be supported over a given bandwidth.
DSC can also have some drawbacks. For example, some monitors may not be fully compatible with DSC. This may cause display issues or blanking.
Další informace
Recommended Articles
Here are some recommended articles related to this topic that might be of interest to you.