I'm working on a troublesome issue for an end user who experiences flickering with one of their external monitors when using it at home. The setup includes a Dell Latitude 5450 laptop connected through a docking station. This flickering is not present when they use the monitors in the office environment. The user has two external monitors: one connected via DisplayPort and the other via HDMI. Here's what they've tried so far:
- Restarted the laptop
- Made sure the correct input type was selected on the monitor
- Power cycled the docking station and both monitors
- Updated Windows and blocked the latest update temporarily
- Updated drivers and firmware for both the laptop and docking station, including BIOS
- Reseated all cables and swapped out both DisplayPort and HDMI cables
- Tested the flickering monitor directly connected to the laptop, bypassing the dock
- Ran a hardware scan with Dell SupportAssist, which returned no issues
- Swapped the docking station for an identical one and updated its firmware
- Tried a different monitor, but the same flickering occurred
- Used power from different outlets around the home to rule out circuit issues
- Adjusted power settings in Device Manager to prevent the dock from being powered down
- Checked that the monitor's resolution and refresh rate are supported by the dock
- Ensured the dock has adequate power supply (130W)
Despite these efforts, nothing seems to resolve the flickering, and it only happens at home. Any ideas on what else could be checked or tried? Note that bringing the entire setup to the office for testing is not feasible due to size constraints.
5 Answers
It sounds like your end user could be facing an EMI (electromagnetic interference) issue, possibly from their gaslift chair or something else nearby. I recommend checking cables that have built-in ferrite clamps or adding those clamps to existing cables. They're inexpensive and can help mitigate this kind of interference. Also, consider looking into whether there's a need for any configuration tweaks in the display settings that might help.
I had a problem before where a small desk fan caused similar issues. It's surprising what can cause interference, so it’s worth checking all devices around the setup.
I've had similar flickering problems that were caused by other devices on the desk. In the cases I dealt with, unplugging everything except the monitor helped isolate the issue. Try removing any other peripherals one by one, such as speakers or fans, to see if any of them are causing interference.
Good idea! Sometimes it’s the simplest things that fix the problem. I had a similar issue fixed just by moving my monitor away from my desk components.
For sure, the environment matters! Identifying the culprit is often a process of elimination.
It could be an electrical wiring issue at the user's home. They might be dealing with 'dirty' power that causes the equipment to behave erratically. I'd recommend testing outlets for voltage stability and possibly using a line conditioner to see if it improves the situation.
That's a solid point! Dirty power can definitely lead to all sorts of weird tech problems.
Yes, if there are voltage swings, that can cause issues. A line conditioner might be a smart investment if this is an ongoing problem.
Have you considered that static electricity from moving in and out of their chair might be causing this? I had a similar issue at work where the static built up from my chair would cause my monitors to flicker. It might be worth looking into!
Honestly, that could definitely be it. I experienced something similar before I switched positions; the static from my chair would blank out my monitors for a moment. It's more common than you'd think with docked monitors!
Yeah, I’ve noticed it happening too. It’s surprising how often static electricity can cause these kinds of interruptions.
I saw that this issue is pretty common with docks. If the dock gets finicky with power, it can cause bizarre issues. Ensure the docking station's power supply is adequate and that nothing unusual is going on with the graphics drivers. Sometimes it's as simple as a firmware issue.
Couldn’t agree more! Docks are finicky, and we've seen that power supply issues can lead to major headaches.
Absolutely! Sometimes just double-checking the power output and compatibility can make a huge difference.
Great suggestion! I always make it a habit to use ferrite clamps on my cables now; they really do help with any weird electrical issues.