Direct answer
For the Lenovo Yoga 9i 2-in-1 Gen 9, device power, cable capability, hub/dock, port, permissions and driver should be isolated. First, connect one known device directly with its data-capable cable.
What this covers
- Lenovo Yoga 9i 2-in-1 Gen 9 (14IMH9 family)
- Lenovo PC; machine type/model determines BIOS, dock, ports, drivers and warranty configuration.
- The specific fault this record addresses: USB or Thunderbolt device is not recognized
What it does not cover
- ×The same symptom on a different Lenovo product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The port does not support what the device needs
What separates it A device works on one port and not another that looks identical.
How to confirm USB-C ports on the same machine frequently differ in data speed, power delivery and video support. The manual identifies which is which.
- 2
The device needs more power than the port supplies
What separates it External drives that spin up and disconnect, or devices that work on a powered hub and not directly.
How to confirm Bus-powered drives in particular can exceed what a port supplies, especially through an unpowered hub.
- 3
An unpowered hub is dividing available power
What separates it Several devices connected through one hub, with the failures increasing as more are added.
How to confirm An unpowered hub shares one port's power budget across everything connected. A powered hub resolves this.
- 4
The cable is charge-only or has failed
What separates it The device charges but is not detected.
How to confirm Many USB cables carry power but no data. This is one of the most common causes of a device that will not be recognised.
- 5
Debris in the port prevents full insertion
What separates it A connector that does not click in fully or works only at an angle.
How to confirm Inspect with a light. Compacted pocket lint is common and is cleared with the machine off and a non-metallic tool.
- 6
The port has failed physically
What separates it One port fails for every device while others work, sometimes with a loose feel.
How to confirm This is the conclusion once cable, power and capability are eliminated.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether the device fails on every port or only one.
- Whether a different cable behaves differently — many cables carry power but no data.
- Whether the device is connected through a hub, and whether that hub is powered.
- What the manual says the affected port supports.
Try the device on every port
ReversiblePorts that look identical often differ in speed, power and video support.
Try a different cable
ReversibleA charge-only cable is one of the most common reasons a device charges but is never detected.
Connect directly rather than through a hub
ReversibleAn unpowered hub divides a single port's power budget across everything on it.
Use a powered hub for bus-powered drives
ReversibleExternal drives commonly need more current than a port supplies on its own.
Inspect the port for debris with the machine powered off
ReversibleCompacted lint prevents full insertion and mimics a failed port.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- 14IMH9 family. Lenovo PC; machine type/model determines BIOS, dock, ports, drivers and warranty configuration.
- Tier — premium 2-in-1 CONVERTIBLE (Windows 11)
- A premium Windows 11 convertible — 360° hinge into tablet/tent/stand modes, an OLED touchscreen, a rotating soundbar hinge and pen support. Tablet-mode and pen symptoms apply.
- Convertible modes
- Folding past the keyboard switches to tablet mode and disables the keyboard/trackpad by design. Auto-rotate toggles in the Action Center.
- Pen & OLED
- Supports an active pen (a garaged/included pen on many builds) — a pen issue is usually a flat battery or pairing. OLED can show temporary image retention that clears.
- Power path
- Internal or removable battery. Every capability that costs current — night vision, higher stream quality, longer recordings, frequent events — is paid for in runtime, so a change in behaviour after a settings change is usually a power consequence rather than a fault. Cold weather reduces usable capacity sharply.
- Symptom boundary
- This record covers Lenovo Yoga 9i 2-in-1 Gen 9 when it USB or Thunderbolt device is not recognized. A different symptom on the same hardware, or this symptom on a different Lenovo product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Stop for a hot connector, a burning smell, or a port that has physical damage — and do not force a connector that does not seat.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Lenovo Support publishes this as "PC support". Official Lenovo model lookup, drivers, diagnostics, manuals and repair support. What that article does not carry is the model boundary — it is written for a product line, and 14IMH9 family is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
My Lenovo Yoga 9i keyboard doesn't work when I fold it.+
That is intended — folding the screen back past laptop mode into tent, stand or tablet mode makes Windows disable the physical keyboard and trackpad so you do not trigger keys against a surface. Fold it back to normal laptop mode and they return. If the keyboard is dead in laptop mode too, restart, update drivers via Lenovo Vantage, and check whether a tablet-mode state is stuck. The rotating soundbar hinge, meanwhile, is normal design, not a loose part.
My external drive works on one port but not the other.+
Those ports are probably not identical even though they look it. USB-C ports on the same machine often differ in data speed, power delivery and video support, and the manual identifies which is which. A bus-powered drive may also simply need more current than the weaker port provides.
My phone charges from the laptop but won't show up.+
That is very likely the cable. A great many USB cables carry power but no data lines at all — they are made for charging only. Try a different cable known to have worked for data transfer before assuming the port or the device is at fault.
Does this answer apply to every Lenovo model?+
No. It is scoped to 14IMH9 family. Lenovo PC; machine type/model determines BIOS, dock, ports, drivers and warranty configuration.
What should I record before troubleshooting USB not recognized or Thunderbolt?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing USB not recognized, Thunderbolt. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for hot connectors, bent ports, sparks or liquid.
Answer for the exact device and software version shown above.