White bloom around cursor when it moves, Macbook pro m4

This new display uses new technology, never seen before in a MacBook Pro screen. Brightness is inherently better already, but perhaps there are some side-effects.

Apple instead opted for mini-LED technology in recent models. The latest M4 MacBook Pro takes this a step further by incorporating quantum dot technology.

https://www.simplymac.com/macbooks/m4-macbook-pro-upgraded-to-a-quantum-dot-display

if yours is showing blooming, I recommend you turn down the brightness.

Another work-around is to turn OFF High Dynamic Range (HDR). Except for magazine-cover Art creation, you may not notice a strong difference.

If no relief after those steps, you can make an informal report of a bug using the Apple product feedback pages:

Product Feedback - Apple

If you want to pursue a solution, or start a new formal, tracked Bug Report (or camp on to one that has already been created), contact Apple Support:

Official Apple Support

it sounds on first blush like your Brightness is turned up too high.

The cursor is surrounded by a border of white pixels, and a moving cursor will re-draw that many times over in slightly different positions each time.

System Settings > Accessibility > Display has, if you scroll down, the abllty to set a pointer outline color:

If you do not want a separate color, set the outline to match the fill color. See if changes there help the issue you have,

s355th wrote:

Hi there. I've bought my Mackbook around 4 months ago, and now sometimes I face a strange problem: there is a white bloom around the cursor on dark backgrounds. The bloom is brighter on grey backgrounds, but it appears only when cursor moves and disappears when it stops.

Sometimes a reboot helps, sometimes it doesn't. Sometimes it disappears by itself, I don't know why

I have this problem both in safe mode and normal, my OS is up to date

How can I fix it?

you can read more on the "bloom issue"...

https://www.google.com/search?client=firefox-b-1-d&q=apple+kb++bloom+issue

To be proactive you can file a bug report / submit your Apple Feedback here: Product Feedback - Apple

Verify your software is up to date…

The current stable release of Sequoia including bug fixes, security updates is macOS 15.6

Keep your Mac up to date - Apple Support

Keep your Mac up to date - Apple Support