| Item | Description |
|---|---|
| Manufacturer | Positivo |
| Device | C4128B |
| Website | https://loja.meupositivo.com.br/notebook-positivo-duo-c-4128b-celeron-dual-core-windows-11-home-tela-11-full-hd-touch-tecla-netflix-cinza/p |
| Vendor driver (Windows) | https://drivers.positivoinformatica.com.br//11171900_TOUCHPAD.zip |
| Extracted firmware | silead.fw |
| Firmware for gslx680-acpi | silead_ts.fw |
| Display resolution | 1920x1080 |
| Touch panel resolution | 1917x1270 (estimated via evtest) |
| Touch controller | Unknown |
| Multitouch support | Yes (10 points) |
| Finger tracking | Yes |
| Mirrored horizontally | No |
| Mirrored vertically | No |
| Axes swapped | No |
| Tested | Functional with gslx680-acpi, silead works after patching the kernel |
| Comments | Used same parameters as positivo/c464c: ../../tools/scanwindrv SileadTouch.sys && ../../tools/fwtool -c firmware_00.fw -m 1680 -w 1917 -h 1270 -t 10 silead_ts.fw :: evtest says lowest X position is 4, lowest Y position is 11 |