Display oddity upgrading to RO 5.23

Hi all,

I’ve been using a TV/Monitor (Flatron M227WDP) with my R-Pi happily for several years. Upgrading to RO 5.23, however, something strange is going on. The display manager has Auto (M227WDP) (auto-populated by the EDID detection?).

The system thinks the mouse pointer is is displaced to the left or right of where it actually is, e.g. to click on the close icon I have to click an inch to the left (or right) of the icon. The effect seems more pronounced towards the sides of the display.

Incidentally there are a dozen different resolutions on the menu, the effect persists regardless of which one is selected apart from if I choose 640×480.

Any idea what’s going on?

Chris.

The display manager has Auto (M227WDP) (auto-populated by the EDID detection?).

Yes, selecting that option will result in EDID being used.

The system thinks the mouse pointer is is displaced to the left or right of where it actually is, e.g. to click on the close icon I have to click an inch to the left (or right) of the icon. The effect seems more pronounced towards the sides of the display.

Try making sure you have recent firmware in the boot/Loader partition. There was a change a while ago to how the overscan settings are applied, which affected the positioning of the mouse pointer (the OS needs to do some coordinate space conversion to get things to line up correctly)

https://github.com/raspberrypi/firmware/tree/master/boot

bootcode.bin, fixup.dat, and start.elf are the files you’ll need.

Brilliant thanks Jeffrey. I hadn’t realised that I’d replaced only the Rom image on the SD card on that particular Pi and not the other files, which I have now done and all is fine.