<!--Thank you for using postmarketOS! In order to speed up process of resolving your issue, we would like you to fill in the following form. *** NOTE FOR CONFIDENTIAL ISSUES: *** A lot of people can read confidential pmaports issues! If you want to submit something that only the postmarketOS Core Team can see, write to team@postmarketos.org instead of opening an issue here!--> ### Describe your issue #### What's the expected behaviour? Dragging brightness slider smoothly changes screen brightness #### What's the current behaviour? The brightness changes, but I get one of several fun effects along with it: 1. A horizontal (given phone held in portrait mode) bar of variable height appears, filled with garbage pixels (bright noise colors) 2. Brightness flickers rapidly between two values 3. Screen turns off 4. Colors change entirely, e.g screen contents get a green tint 5. Screen displays multiple copies of the GNOME Mobile display in a tiled grid #### How to reproduce your issue? Drag the brightness slider in GNOME Mobile ### What device are you using? fairphone-fp5 ### On what postmarketOS version did you encounter the issue? <!--Replace space inside `[ ]` with `x` to fill the checkbox--> * [x] edge (`master` branch) * [ ] `v25.12` * [ ] `v25.06` (supported until 2026-01-23) * [x] I confirm that the issue still is present after running `sudo apk upgrade -a` ### On what environment did you encounter the issue? #### Environments * [ ] COSMIC * [x] GNOME Shell on Mobile * [ ] Phosh * [ ] Plasma Mobile * [ ] Sxmo (Wayland/Sway) **Please post the output of `sxmo_version.sh`** * [ ] Other: **Please fill out** ### Which init system are you using? * [ ] OpenRC * [x] systemd ### How did you get postmarketOS image? * [ ] from https://images.postmarketos.org * [x] I built it using pmbootstrap * [ ] It was preinstalled on my device ### What's the build date of the image? (in yyyy-mm-dd format) <!--Notes: can be left empty if unsure If you downloaded image from images.postmarketos.org, date will be in yyyymmdd format--> ### Additional information Tapping a spot in the brightness slider correctly sets the brightness, so I guess the issue is triggered by lots of events being sent that adjust the level. <!--logs, etc. -- make use <details> for long listings If your device displays an error message on boot or drops to the debug shell, attaching it to your PC with a USB cable may show a removable USB drive. You can drag and drop the .tar.gz file or otherwise upload it here. Refer to the README file on the device for more information.-->