Android Screen Not Rotating: Accelerometer Sensor
A user reports that their Android smartphone's screen does not rotate when the device is turned sideways. The auto-rotate setting is enabled. Which of the following is the MOST likely cause?
Quick Answer
The answer is a faulty accelerometer sensor. This is correct because the accelerometer is the hardware component that detects the device’s physical orientation by measuring linear acceleration along the x, y, and z axes; when auto-rotate is enabled but the screen does not rotate, the operating system is not receiving the orientation data it needs, pointing directly to a sensor failure rather than a software or display issue. On the CompTIA A+ Core 1 220-1101 exam, this scenario tests your ability to distinguish between sensor hardware failures and configuration problems—a common trap is assuming the gyroscope is responsible, but the gyroscope measures rotation rate, not static orientation. Remember, the accelerometer senses which way is “down,” so if your Android screen not rotating persists with auto-rotate on, think “accelerometer, not gyroscope.” A handy mnemonic: “Accelerometer Aligns, Gyroscope Gyrates.”
⚠ Common exam trap
It's easy for candidates to confuse the gyroscope with the accelerometer, assuming the gyroscope handles screen rotation, but the accelerometer is the primary sensor for detecting basic orientation changes.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The accelerometer sensor is faulty.
The accelerometer sensor is responsible for detecting the orientation of the device by measuring linear acceleration along the x, y, and z axes. When auto-rotate is enabled but the screen fails to rotate, a faulty accelerometer is the most likely cause because the operating system relies on this sensor to determine when to switch between portrait and landscape modes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The gyroscope sensor is faulty.
Why it's wrong here
Auto-rotate on Android relies primarily on the accelerometer to detect orientation; the gyroscope measures rotational velocity and is not the sensor that triggers screen rotation. It is tempting because both are motion sensors, but a faulty accelerometer is the likely cause, not the gyroscope.
When this WOULD be correct
A user reports that a 3D game or augmented reality app does not respond to tilting or turning the device. In that scenario, the gyroscope is used for precise rotational movement tracking, making it the likely cause.
- ✓
The accelerometer sensor is faulty.
Why this is correct
A faulty accelerometer directly explains the failure: Android relies on this sensor to detect orientation changes and trigger screen rotation. Since auto-rotate is already enabled, the software setting is satisfied, leaving the hardware sensor as the most likely fault. A gyroscope assists with finer motion, but the accelerometer governs basic tilt detection.
- ✗
The magnetometer sensor is faulty.
Why it's wrong here
The magnetometer detects magnetic fields for compass functions, not device orientation, so its failure would not stop screen rotation. It is tempting because it is a sensor in the same chip cluster, but the accelerometer drives auto-rotate, making it the component to test.
When this WOULD be correct
A user reports that their smartphone's compass app shows incorrect directions. The auto-rotate setting is enabled. Which sensor is most likely faulty?
- ✗
The proximity sensor is faulty.
Why it's wrong here
The proximity sensor blanks the display during calls, not orientation; auto-rotate relies on the accelerometer or gyroscope. A faulty proximity sensor would cause the screen to switch off when an object nears the earpiece, so it is tempting when rotation symptoms are misattributed to sensor failure.
When this WOULD be correct
A user reports that the screen turns off during calls or that the phone's display does not wake when removing it from the ear. In that scenario, a faulty proximity sensor would be the most likely cause.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓The accelerometer sensor is faulty.Correct answer▾
Why this is correct
A faulty accelerometer directly explains the failure: Android relies on this sensor to detect orientation changes and trigger screen rotation. Since auto-rotate is already enabled, the software setting is satisfied, leaving the hardware sensor as the most likely fault. A gyroscope assists with finer motion, but the accelerometer governs basic tilt detection.
✗The gyroscope sensor is faulty.Wrong answer — click to see why▾
Why this is wrong here
Screen rotation relies on the accelerometer to detect device orientation. The gyroscope measures angular velocity, not static orientation, so a faulty gyroscope would not prevent auto-rotation.
★ When this WOULD be the correct answer
A user reports that a 3D game or augmented reality app does not respond to tilting or turning the device. In that scenario, the gyroscope is used for precise rotational movement tracking, making it the likely cause.
Why candidates choose this
Candidates often confuse gyroscope and accelerometer functions, assuming both are needed for rotation, or they overestimate the gyroscope's role in basic screen rotation.
✗The magnetometer sensor is faulty.Wrong answer — click to see why▾
Why this is wrong here
The magnetometer measures magnetic fields for compass orientation, not device rotation. Screen rotation relies on the accelerometer detecting gravity's direction.
★ When this WOULD be the correct answer
A user reports that their smartphone's compass app shows incorrect directions. The auto-rotate setting is enabled. Which sensor is most likely faulty?
Why candidates choose this
Candidates may confuse the magnetometer with the gyroscope or accelerometer, assuming it handles all orientation tasks.
✗The proximity sensor is faulty.Wrong answer — click to see why▾
Why this is wrong here
The proximity sensor detects when an object is near the screen (e.g., during a call) and typically turns off the display; it does not control screen rotation. A faulty proximity sensor would not prevent auto-rotate.
★ When this WOULD be the correct answer
A user reports that the screen turns off during calls or that the phone's display does not wake when removing it from the ear. In that scenario, a faulty proximity sensor would be the most likely cause.
Why candidates choose this
Candidates may confuse the proximity sensor with orientation sensors, thinking it detects device movement or tilt, or they may recall that sensors can affect display behavior, leading them to select this option without understanding its specific function.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Same concept, more angles
1 more way this is tested on 220-1101
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A user reports that their Android smartphone's screen does not rotate when the phone is turned sideways. The auto-rotate setting is enabled. The technician has already verified that the phone's operating system and apps are up to date. Which of the following is the MOST likely cause of this issue?
medium- ✓ A.The accelerometer is malfunctioning.
- B.The gyroscope is malfunctioning.
- C.The touchscreen digitizer is damaged.
- D.The proximity sensor is blocked.
Why A: The accelerometer is the sensor responsible for detecting the device's orientation and triggering screen rotation. Since auto-rotate is enabled and the OS/apps are up to date, a malfunctioning accelerometer is the most likely cause, as it would fail to send the correct orientation data to the system.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.