Test mouse input through a hub for a keyboard claim

If you are preparing a keyboard repair claim, you may also be checking whether other devices behave differently through the same USB hub. A mouse comparison can help identify a hub or port issue, but it cannot prove that the keyboard itself is faulty.

Use the same mouse and computer to compare the hub connection with a direct USB connection. Keep notes about what changes, then test the keyboard separately so your claim is based on evidence from the keyboard, not a different device.

Compare the mouse through the hub and directly

1. Open the Mouse Test in your browser. Keep the mouse on the same surface for each run.
2. Connect the mouse to the USB hub. Test each mouse button, use the scroll wheel, and try deliberate single and double clicks. Note any missed, repeated, or delayed input.
3. Disconnect the mouse and connect it directly to the computer, using the same mouse and browser. Repeat the same actions in the same order.
4. Compare the results. If the test reports polling rate, note it for each connection, but do not treat a small difference by itself as proof of a fault.
5. Repeat the comparison once. Record the hub and port used, whether the hub has external power, the mouse connection type, and which symptoms happened each time.

A wireless mouse connected through a USB receiver still uses the hub for that receiver. A Bluetooth mouse does not pass through a USB hub unless its Bluetooth adapter is plugged into the hub. Keep this distinction in your notes.

What the results mean

The mouse fails only through the hub

If clicks or scrolling are missed through the hub but work when connected directly, the hub, its cable, its power, or that specific port may be involved. This is useful context for troubleshooting, but it does not establish that the keyboard has the same fault. Test the keyboard in both configurations before drawing that conclusion.

The mouse fails both ways

If the same mouse problem appears through the hub and directly, the hub is less likely to be the only cause. Check the mouse, its receiver or cable, and system settings. A mouse failure still does not show that the keyboard has a hardware defect.

The mouse works in both connections

This shows that the mouse produces the tested inputs in those two setups. It does not rule out an intermittent hub problem, a keyboard-specific compatibility issue, or a fault that appears only when more devices are connected.

The polling rate changes, but clicks work

Polling rate is how often the mouse reports its position or button state. Browser scheduling, the mouse's settings, and the connection can affect the reported result. A rate difference alone is not a reliable repair diagnosis. Focus on repeatable missed clicks, unexpected double clicks, or scrolling failures.

You are collecting evidence for the keyboard

Test the keyboard directly and through the hub, using the same computer and browser. The Keyboard Test checks whether keys register and how many keys work at once. Record the specific keys that fail and whether the result changes between connections. A mouse test is supporting information about the setup, not a substitute for keyboard results. For more on documenting keyboard symptoms, see Keyboard repair claim: document key failures.

How to reduce confusing results

1. Use one connection change at a time. Compare the hub with a direct port, but do not also change the mouse, surface, browser, and settings between runs. That makes it easier to tell which change matters.
2. Try another USB port. Test a different port on the computer with the same mouse. If a desktop has front and rear ports, include one of each and note which you used.
3. Check the hub's power and cable. If the hub has an optional power adapter, connect it as designed. Try another hub cable if you have one. Avoid adding several adapters or extension cables while testing.
4. Check mouse settings. In Windows 11, open Settings › Bluetooth & devices › Mouse. On macOS, open System Settings › Mouse. Keep pointer and scrolling settings unchanged during the comparison.
5. Check keyboard settings separately. On Windows 11, look under Settings › Accessibility › Keyboard. On macOS, open System Settings › Accessibility › Keyboard. Accessibility features can affect typing, so note their state before changing anything.
6. Reconnect and restart. Unplug and reconnect the hub, then restart the computer if the behavior continues. Retest before changing drivers or resetting settings.

What to include in a repair claim

Keep the evidence focused on the keyboard. Note the keyboard model, the failing keys, the computer and operating system, the hub model, and whether the keyboard was connected through the hub or directly. Include the date and the steps that reproduce the failure. If you capture screenshots or a short recording, show the test and the key behavior without exposing unrelated personal information.

Do not describe a mouse result as proof of a keyboard defect. If the keyboard fails consistently when connected directly to more than one computer, that points more strongly toward the keyboard. If it works directly but fails through one hub, report that difference and include the hub setup as context.

When the hub or mouse may be at fault

If the mouse only misbehaves through one hub, try that hub with another computer and, if possible, try a different mouse through it. If several devices disconnect or miss input through the same hub, the hub or its cable is a stronger suspect. If only one mouse fails across multiple computers and direct ports, consider its cable, receiver, or internal switch. A test can show a repeatable symptom, but it cannot identify a failed component with certainty.

Keep each comparison short and repeatable. Do not keep changing several settings at once, because that can make a useful repair report harder to interpret.