Invalid Ppi Samsung

What “Invalid PPI” Means on Samsung

The OS or an app requests display density (DPI/PPI) but receives a value that doesn’t match hardware or ro.sf.lcd_density.
Symptoms: UI scaling glitches, touch misalignment, app crashes, “display metrics not found.”
Samsung’s One UI is sensitive because of adaptive refresh rates and per-app scaling.

Reset screen zoom / font size back to default.
Uninstall display-altering apps.
Reboot; if issue persists, boot to Safe Mode and test.
Install pending system updates.
Backup and factory reset if nothing else works.

2. The DeX and External Monitor Conflict

Samsung DeX is a miracle of engineering, but it is also a nightmare for display logic. When you plug your phone into a 4K monitor, your phone is driving two displays simultaneously: the phone’s native 500+ PPI panel and the monitor’s ~160 PPI panel. If an app tries to read the primary display density while rendering on the secondary display, the math breaks. The app gets confused about which PPI to use. Result? Invalid PPI.

2. Mismatched Firmware and SyncThru Settings

If your IT department enabled PPI features via SyncThru Web Admin Service but did not update the printer’s firmware accordingly, or vice versa, the printer becomes confused. It expects authentication that doesn't exist. invalid ppi samsung