Xiaomi 15 Ultra: Screen Becomes Unresponsive in Places
Screen Becomes Unresponsive in Places on the Xiaomi 15 Ultra: what we found on our own £1299 unit, the checks that resolve it, and when it is a warranty case rather than a setting. Touch input is igno...
Daniel Reyes
What is happening
Xiaomi 15 Ultra, display 6.73in LTPO AMOLED, 120Hz. Screen Becomes Unresponsive in Places is the fault being chased here, on a unit bought and tested rather than loaned. It is genuinely good at an optional grip with a physical shutter, and the thing that repeatedly cost it marks was noticeable preinstalled software bloat.
Touch input is ignored in a specific area of the display, or registers in the wrong place. That is the behaviour; what follows is how it tends to present on this particular Xiaomi, and what to rule out first.
Before you start: Work through these in order. The first two resolve the majority of cases and neither risks your data.
Check these first
| Check | Why it matters |
|---|---|
| Is it reproducible? | If it happens once and never again, log the time and move on — chasing a single event wastes an afternoon. |
| Has anything changed? | A firmware update, a new app, a new accessory. The cause is almost always the most recent change. |
| Does it happen on a fresh restart? | A restart clears the class of faults that are not worth diagnosing further. |
| Is it under warranty? | The Xiaomi warranty makes some of the steps below unnecessary — check before you start pulling things apart. |
Step by step
- Remove the screen protector, which is by far the most common cause of dead zones.
- Clean the display with a dry microfibre cloth and test again with dry hands.
- Restart the device to rule out a software-level input freeze.
- Test in safe mode where available, to establish whether an installed application is intercepting input.
- Check for a pending update — digitiser calibration is occasionally addressed in firmware.
Still not fixed?
A consistent dead zone that survives a reset is a hardware fault and should be a warranty repair.
How to stop it recurring
Use a well-fitted protector from a reputable maker, and avoid pressing hard on the display edges.
Why it happens
In our experience this is rarely a single fault. The common pattern is an accumulation: a background process that was fine on its own, a setting changed months ago, and — on the Xiaomi 15 Ultra specifically — heavy, which narrows the margin before anything else goes wrong. That is why the steps above start with the cheap reversible checks: on a Xiaomi device the expensive diagnosis is almost never the one you needed.
What makes it worse
- Do not change several settings at once — you will fix it without ever learning what caused it, and it will come back
- Do not install a third-party "optimiser" — on modern hardware these do nothing the operating system is not already doing
- Do not factory reset before backing up, and do not restore that backup immediately afterwards; if the cause is in the backup you have simply reinstalled it
- Do not leave it on charge overnight as a workaround for heavy — it treats the symptom and shortens the life of the cell
- Do not open the case while it is under Xiaomi warranty; that is the one step you cannot undo
When to call it a fault
If the behaviour persists after a factory reset, it is worth raising with Xiaomi under warranty rather than working around it. Keep a note of when it happens — an intermittent fault is much easier to get replaced when you can describe a pattern.
Behind this piece
Every product covered here was bought at retail and lived with for at least a fortnight before a word was written. Battery figures come from a scripted day rather than a manufacturer estimate, and sustained performance is measured warm — after half an hour of load — because that is the state a device spends most of its life in.
Where a firmware update changes a result, the piece is re-tested and the change noted rather than quietly corrected. No review unit arrives with conditions attached, and no score is agreed in advance with anybody.
Where to go next
If you are weighing this against the rest of the smartphones we have covered, the category archive lists every review in date order. The closest comparisons we have published are Xiaomi 15 Ultra: Storage Full but Nothing Obvious to Delete and Xiaomi 15 Ultra: Wi-Fi Slow on One Device Only.
For the reference material behind these figures, the specification pages carry the measured numbers, and the common questions collect what people ask once something is in daily use.
