Why the camera is on Xiaomi Redmi Note 9: a full analysis of the causes and solutions

Owners of Xiaomi Redmi Note 9 often face a problem when the camera begins to slow down, hang or even refuse to work: slow focus, freezes when switching between modules, black screen instead of image – these symptoms can manifest in both the standard camera app and third-party programs like Instagram or Snapchat. Most of the problems are software-based, but sometimes hardware limitations or physical damage are to blame.

The Redmi Note 9 (codenamed merlin) has a 48 MP quad camera, but even budget hardware has to handle basic photography without delay. If the lags come on suddenly, it's probably software, system updates, or application conflict. If the brakes have been around since the purchase, it's probably factory defects or suboptimal settings. In this article, we'll look at all the possible causes and give step-by-step diagnostic and repair instructions.

1. System overload: why the camera brakes because of the background

The most common reason for camera lags on the Redmi Note 9 is a lack of RAM. The model is equipped with 3-4 GB of RAM, but even this is not always enough, especially if heavy applications are running in the background. The camera requires significant resources to process the image, and if the system is busy with other tasks, there are slowdowns.

How to check:

• 📱 Open the Settings. → The phone. → Memory and see how much RAM there is left. If it's less than 500MB, the system is overloaded.
• 🔄 Launch the camera and quickly switch to Recent apps (swipe up late). If there's 10 hanging there+ programs, they steal resources.
• 📊 Install the app CPU Monitor or DevCheck to monitor CPU load in real time.

Decisions:

• 🧹 Close all background apps before shooting (especially games, social networks and instant messengers).
• 🔄 Reboot the phone – this clears the cache and frees up RAM.
• 🚫 Turn off auto-run of unnecessary programs in Settings → Annexes → Auto-start.
• ⚡ Enable Performance Mode in Settings → Battery → Performance mode (not available on all firmware).

⚠️ Warning: If after closing all free RAM applications, it is still less than 300 MB - it is possible that the phone is running malware or the system is damaged. Check the phone with antivirus (Malwarebytes or Dr.Web) and if necessary, reset to factory settings.

2. Problems with firmware and updates MIUI

Xiaomi regularly releases updates for the Redmi Note 9, but not all are optimized for the camera. MIUI — Especially if the update was "raw" or installed through theTA It's a common symptom:

• The camera opens for a long time (5).+ seconds).
• When shooting the video, artifacts or slowdowns appear.
• The camera app crashes with the error "Camera stopped."

How to check the firmware version:

1. Open the settings → About the phone → version of MIUI.
2. Compare the latest stable versions on Xiaomi’s official website.
3. If your version is 2 years older+ months ago, the bugs may have been fixed in the new builds.

Decisions:

• 🔄 Update the firmware through Settings → System Update. If the update doesn't come, download it manually from Xiaomi's site and install it via Update. → Three points. → Select a firmware file.
• 📥 If the lags appeared after the update - roll back to the previous version MIUI (guideline).
• 🔧 Install a custom core or firmware (like Pixel Experience) if official updates don't help.

3. Conflict with third-party applications

The camera on the Redmi Note 9 may be slowing down due to conflict with other programs, especially if they:

• Using a camera in the background (e.g. Snapchat, TikTok, scanning apps) QR-code).
• Block access to the camera through permissions or system hooks (antiviruses, optimizers).
• Modify the camera (applications for manual settings like Manual Camera or GCam).

How to find the culprit:

1. Launch your phone in Safe Mode (press the power button) → long tap on "Switch off" → "Safe Mode. If the camera is operating normally in this mode, the problem is in one of the installed applications.
2. Check the camera permissions: Settings → Annexes → Permit management → Camera, disable access to suspicious software.
3. Remove the newly installed apps one by one, testing the camera after each removal.

Top.-5 The apps that most often conflict with the Redmi Note camera 9:

• 🎮 PUBG Mobile/Call of Duty (using a camera for anticheats).
• 🔒 Clean Master, DU Speed Booster (Blocking Camera Processes).
• 📸 B612, Snow (intercepts control of the camera).
• 🛡️ Avast, 360 Security (Scanning the Camera as a Potential Threat).
• 🤖 MacroDroid and Tasker (can automatically close the camera).

⚠️ Note: If you are using GCam (Google Camera) make sure the port version is optimized for the Redmi Note 9 (Meditek Helio processor) G85). Improper assembly can cause overheating and lags: Recommended versions: BSG Shamim.

Hardware problems: when iron is to blame

If software methods didn't help, maybe the problem lies in the hardware.The Redmi Note 9 is not highly reliable chamber module, especially after falls or moisture.

Signs of hardware malfunctions:

• 📷 The camera says “I couldn’t connect to the camera” even after the reboot.
• 🔍 Autofocus does not work at all (does not click, does not snoop).
• 💥 When switching between modules, extraneous sounds are heard (screaming, crackling).
• 🌡️ The phone is very warm in the area of the camera (over 50).°C according to data AIDA64).

The most common hardware reasons:

What to do:

• 🔧 If the phone falls or gets wet, don’t try drying it with a hair dryer or rice. ~1500–2500 ₽).
• 🔥 If the processor is warming, try replacing the thermopaste (video instructions are available on YouTube for Redmi Note 9).
• 📦 If the camera isn't focusing, the autofocus motor may have broken. It'll cost you 2000 to 3,500 to repair. ₽.

💡

Before visiting the service center, make a backup copy of the data through Settings → Additionally. → Backup. Some workshops reset the phone to factory settings before repairs.

5. Non-optimal camera settings

Even on stock firmware, the Redmi Note camera 9 It can brake because of incorrect settings. HDR or AI-The processor is heavily loaded and the shooting in 4K@30fps It requires more bandwidth than Helio can provide. G85.

Optimal settings for smooth operation:

• 📸 Photo resolution: 12 MP (instead of 48 MP) – less noise and faster processing.
• 🎥 Video: 1080p@30fps (4K Turn on only in good lighting).
• ⚡ HDR: Turn off or use only in bright light.
• 🤖 AI-Camera: Turn it off - it's constantly analyzing the scene, slowing down the shooting.
• 🔄 Serial shooting: Limit to 10-20 frames, otherwise the buffer will overflow.

How to change the settings:

1. Open the Camera app.
2. Put it on the gear (⚙️) Or swipe sideways for additional modes.
3. In the Camera Settings section, disable unnecessary options (see the list above).
4. Select for the video 1080p and 30fps permission settings.

Shut down. AI-regime|Set photo resolution for 12 MP|Turn it off. HDR use only during the day|Reduce video resolution to 1080p|Limit serial shooting to 10 frames-->

If even after optimization the camera is lagging - try resetting the application settings:

1. Go to Settings. → Annexes → Application management → Camera.
2. Click Warehouse → Clear the cache and Clear the data.
3. Reboot the phone.

Storage problems: space shortage and fragmentation

The Redmi Note 9 comes with 64 or 128GB of storage, but even that might not be enough if you’re shooting a lot of video in the video. 4K Or you can store thousands of photos, and when you have less than 10 percent of the space, the camera starts to brake because of the fact that it's not there:

• 📁 Memory fragments – files are scattered throughout the drive, and the camera has to “assemble” them in pieces.
• 🗑️ Lack of buffer space – the camera can’t save temporary files.
• 🔄 Slow recording on microSD – if you save a photo to a class memory card below UHS-I (U3).

How to check and correct:

1. Go to Settings. → Storage and see how much space is available. If it's less than 5GB, delete the files you don't need.
2. Move your photos and videos to your PC or cloud (Google Photos, Mi Cloud).
3. If you use a microSD, check its speed. A1 SD Bench Class Cards 4/6 not fit 4K-video!
4. Defragment (for microSD only, internal memory cannot be defragmented):

adb shell fstrim -v /data

(The command requires an unlocked boot loader and ADB).

⚠️ Note: If you save a photo on a microSD, but the camera still lags - try formatting the card in exFAT (via PC) and check it for errors using the help of the computer. H2testw. Brave cards often cause hangings.

7.CPU overheating and trottling

Mediatek Helio G85 Redmi Note 9 is prone to overheating, especially when shooting videos or using the camera in hot weather.°C, triggers trottling - forced performance decline, which causes the camera to brake.

Signs of trottling:

• 🌡️ The phone gets hot at the top (near the camera).
• ⚡ Performance drops after 5-10 minutes of shooting.
• 📉 V CPU Monitor processor frequency drops below 1.8GHz.

How to reduce heat:

• 🧊 Remove the cover before shooting - it worsens the heat sink.
• 🔋 Close all background apps (especially games).
• ☀️ Avoid shooting in direct sunlight.
• 📶 Turn off mobile internet and Wi-Fi if you don’t need them.
• 🔄 Reduce video resolution to 1080p Or use an external fan (for example, USB-cooler).

If overheating occurs even in simple scenes (for example, when taking a photo), the thermal paste may have dried up.

1. Take your phone apart (video instructions are available on YouTube for Redmi Note 9).
2. Clean the old thermopaste from the processor and radiator with alcohol.
3. Apply a new thermal paste (Arctic) MX-4 noctua NT-H1).
4. Check if the radiator fits tightly - if not, put a thin heat pad.

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If the camera is only recording the video in 4K — It's normal for Helio. G85. The processor can't physically encode that flow. 1080p smoothly.

FAQ: Frequent questions about camera lags on the Redmi Note 9