[Miracast] 4K resolution not showing up for my 2nd display

Troubleshooting Inconsistent 4K Resolution with Miracast on Windows Devices

Introduction

Wireless display technologies like Miracast have revolutionized the way we connect our devices to external monitors, offering convenience without the clutter of cables. However, users sometimes encounter issues where desired resolutions, such as 4K, are not consistently available or displayed. This article explores common causes and solutions for fluctuating Miracast resolution options, based on real-world user experiences.

Understanding the Context

Consider a scenario where a user’s laptop supports Miracast for screen projection, but the 4K resolution option intermittently appears in display settings. The user’s setup includes:

• Hardware: Lenovo Ideapad S145 with an 8th Gen Intel Core i5 processor, NVIDIA MX110 graphics, and 20 GB of RAM.
• Network: Connected via a stable 5GHz Wi-Fi network with approximately 85 Mbps download and 47.6 Mbps upload speeds.
• Usage: Primarily reading and typing, which tolerates a lower refresh rate of 24Hz.

Despite these parameters, the user notices that while 4K was functioning correctly a few days ago, it no longer appears consistently.

Common Causes of Inconsistent Miracast Resolutions

1. Wireless Network Stability and Bandwidth
   While Miracast is designed to operate over Wi-Fi Direct or similar direct connections, network stability still plays a crucial role. Fluctuations in signal strength or bandwidth can affect bandwidth-intensive resolutions like 4K.

2. Device Compatibility and Driver Support
   Hardware limitations, outdated graphics drivers, or incomplete Miracast implementation can restrict available resolutions. Ensuring that your graphics drivers and wireless network drivers are current can mitigate compatibility issues.

3. Display and Miracast Settings
   Windows settings for multiple displays may sometimes conflict, causing resolution options to fluctuate. Additionally, internal display configurations and scaling settings can influence external display resolution choices.

4. Variability in Miracast Peer Devices
   The monitor or projector supporting Miracast may have its own limitations or compatibility quirks, affecting resolution availability.

5. Intermittent Software Glitches
   Temporary software bugs or Windows updates can also cause display options to change unexpectedly.

Potential Solutions and Recommendations

1. Update Drivers and Firmware
2. Ensure your Wi-Fi, graphics, and display drivers are up to date.

3. Verify the monitor’s firmware supports 4K at the desired refresh rate.

4. Optimize Network Conditions

5. Maintain a stable 5