Dell U5226KW Monitor Goes Black When Set to 6144×2560 120Hz Using Thunderbolt 4 Port
Summary: This article provides more information about the Dell U5226KW monitor may go black when connected using the Thunderbolt 4 port and set to 6144×2560 @120Hz.
This article applies to
This article does not apply to
This article is not tied to any specific product.
Not all product versions are identified in this article.
Symptoms
Affected Products:
- Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW
- Dell Thunderbolt Dock - WD22TB4
Affected Platforms:
- Dell Pro Rugged 14 RB14250
- Dell Pro 14 PC14250
- Latitude 7030 Rugged Extreme Tablet
- Latitude 5430 Chromebook
- Latitude 5430
- XPS 16 9640
- XPS 13 Plus9320
- XPS 14 9440
Issues have been observed under the following actions:
- Restarting, shutting down, or waking the computer from sleep or hibernating
- Signing out and back in, changing resolution, or switching display modes
- Powering the monitor off or on, unplugging and replugging the cable
Cause
Not Applicable
Resolution
Update the monitor Firmware to version M2T103 or higher to resolve the issue.
Older processors such as Alder Lake (12th Gen), Raptor Lake (13th Gen), and Meteor Lake may not support installing the latest monitor firmware due to hardware limitations. If so, users can go to the Input Source in the monitor menu:
- Press and hold the Thunderbolt option for eight seconds to open the hotkey menu.
- Set the Display Stream Compression Bits Per Pixel function and select Support only up to DSC BPP 11
Affected Products
Dell Pro 14 PC14250, Dell Pro Rugged 14 RB14250, Latitude 7030 Rugged Extreme Tablet, Latitude 5430 Chromebook, Latitude 5430, Dell UltraSharp 52 Thunderbolt Hub Monitor U5226KW, Dell Thunderbolt Dock – WD22TB4, XPS 13 Plus 9320, XPS 14 9440
, XPS 16 9640
...
Article Properties
Article Number: 000414269
Article Type: Solution
Last Modified: 24 May 2026
Version: 2
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