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Affected Platforms: Dell Pro Rugged 14 RB14250 Dell Pro Rugged 13 RA13250 Affected Products: Dell Dock WD19S Dell Dock WD19TB Dell Dock WD19DC Dell Pro Dock WD25 Dell Pro Smart Dock SD25 Dell Pro Thunderbolt 4 Dock WD25TB4 Dell Pro Thunderbolt 4 Smart Dock SD25TB4 Dell Pro Thunderbolt 5 Dock WD25TB5 Dell Pro Thunderbolt 5 Smart Dock SD25TB5 Symptoms: When a DisplayPort (DP) monitor is connected to a dock, an HDMI monitor cannot output (WD25 and SD25 series dock) After connecting to a Thunderbolt (TBT) or DP monitors, or a TBT or HDMI monitors and restarting the laptop, the DP, or HDMI monitor cannot output. (WD25 and SD25 series dock) External monitor is blinking after laptop resumes or is restarted, after connecting to an external monitor using a WD25 or an SD25 series dock and then restarting or suspending the laptop There is only one display output on the WD19S dock when multiple monitors are connected to the dock
Enabling panel replay of the Display Stream Compression (DSC) function may result in compatibility issues when operating in Multi-Stream Transport (MST) mode.
Workaround: Recovery methods per symptom: Symptom 1: Lowering the screen resolution to 2K allows for normal output. The HDMI cable connects to the laptop and outputs normally. Symptom 2: Lowering the screen resolution to 2k allows for normal output. Unplugging and replugging the dock cable, both screens can output simultaneously. Symptom 3: After unplugging and replugging the display connector, the display returned to normal Symptom 4: The second monitor connects to the laptop and outputs normally. Long-Term Solution: The solution is in Ubuntu Kernel v6.17, which is scheduled for release in February 2026. How to update the kernel Method 1: Launch the Software Updater app and check Security updates Click Install Now in the bottom right corner. Method 2: Launch Terminal Type sudo apt update & sudo apt upgrade How to check the kernel version: Launch the Terminal Type uname -a
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