> For the complete documentation index, see [llms.txt](https://open-rt.gitbook.io/open-surfacert/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://open-rt.gitbook.io/open-surfacert/surface-rt/hardware/display.md). # Display {% file src="/files/-MObzmYt4kQeJOqDbNlq" %} ## Timing ### Raw EDID from ACPI ``` 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0xa3, 0x42, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x15, 0x01, 0x04, 0xa0, 0x17, 0x0d, 0x78, 0x0a, 0x87, 0xf5, 0x94, 0x57, 0x4f, 0x8c, 0x27, 0x27, 0x50, 0x54, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1e, 0x1c, 0x56, 0xb0, 0x50, 0x00, 0x0a, 0x30, 0x0e, 0x38, 0x13, 0x00, 0xeb, 0x84, 0x00, 0x00, 0x00, 0x19, 0x00, 0x00, 0x00, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0xdc, 0x03, 0x74, 0x00, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xfe, 0x00, 0x31, 0x30, 0x36, 0x41, 0x4c, 0x30, 0x31, 0x2d, 0x30, 0x30, 0x31, 0x0a, 0x20, 0x00, 0x7e ``` {% file src="/files/-MSCOvl\_jnRXZNhZv\_ls" %} Binary version of EDID {% endfile %} ### Decoded EDID Many tools exist which can decode EDID.\ On Ubuntu you can use `edid-decode`.\ The ouput is below\... {% code title="edid\_sRT.txt" %} ``` /* cut binary dump*/ EDID version: 1.4 Manufacturer: SEC Model 12610 Serial Number 0 Made in year 2011 Digital display 8 bits per primary color channel Digital interface is not defined Maximum image size: 23 cm x 13 cm Gamma: 2.20 Supported color formats: RGB 4:4:4, YCrCb 4:4:4 First detailed timing includes the native pixel format and preferred refresh rate Color Characteristics Red: 0.5800, 0.3398 Green: 0.3095, 0.5498 Blue: 0.1552, 0.1552 White: 0.3134, 0.3291 Established Timings I & II: none Standard Timings: none Detailed mode: Clock 71.980 MHz, 235 mm x 132 mm 1366 1380 1436 1542 ( 14 56 106) 768 769 772 778 ( 1 3 6) -hsync -vsync VertFreq: 60.000 Hz, HorFreq: 46.680 kHz Manufacturer-Specified Display Descriptor (0x0f): 00 0f 00 00 00 00 00 00 00 00 00 44 dc 03 74 00 ...........D..t. Alphanumeric Data String: SAMSUNG Alphanumeric Data String: 106AL01-001 Checksum: 0x7e ``` {% endcode %} {% file src="/files/-MSCP9\_mHqhafH2HjIvc" %} Human Readable version of EDID {% endfile %} You can also use this [EDID reader](http://www.edidreader.com/) page ### Translated to devicetree **WIP**\ At the we use a samsung display with same resolution and similar timings which works.\ But to optimize the devicetree someone has to decode EDID to panel-timings {% embed url="" %} page 57 ## GPIOs Controlling the following GPIOs from UEFI Shell gave the result below. The GPIOs were extracted from ACPI | GPIO | Backlight | Logo | Note | Function | | ---- | --------- | ---- | --------------------------------------------------------- | --------------- | | B2 | Y | N | Image fades out | LVDS power down | | DD0 | N | Y |

Logo can bee seen with

external light source

| backlight power | | DD2 | N | N | Display is dead | panel power | | H0 | N | Y | PWM brightness control | PWM brightness | ## Connector ![](https://2395005476-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MJQb34R_xPz0ll0scbM%2F-MQzx939TIx4tQaL-hcA%2F-MR0C0lNSxYLE7dkrM0H%2Fimage.png?alt=media\&token=164a1f23-5970-44cd-b64d-024cc8319be6) | Pin | | | ------------------- | ----------------------- | | 2/3 Panel VDD | GPIO DD2 | | 25 BL\_PWM | GPIO H0 | | 26 Backlight enable | GPIO DD0 | | 28/29/30 LED Anode | Always connected to 12V |