Hi @f.mazur,
It seems that you can read the detected EDID of a connected HDMI monitor on apalis IMX8QM with:
root@apalis-imx8:/# hexdump -C /sys/class/drm/card1-HDMI-A-1/edid
00000000 00 ff ff ff ff ff ff 00 41 0c cd c0 8a d5 00 00 |........A.......|
00000010 18 1f 01 03 80 29 17 78 2a 0c c5 a4 57 50 a1 28 |.....).x*...WP.(|
00000020 0d 50 54 bd 4a 00 81 80 81 c0 81 40 01 01 01 01 |.PT.J......@....|
00000030 01 01 01 01 01 01 66 21 56 aa 51 00 1e 30 46 8f |......f!V.Q..0F.|
00000040 33 00 9a e6 10 00 00 1e 00 00 00 ff 00 41 46 43 |3............AFC|
00000050 32 31 32 34 30 35 34 36 36 36 00 00 00 fc 00 50 |2124054666.....P|
00000060 48 4c 20 31 39 33 56 35 0a 20 20 20 00 00 00 fd |HL 193V5. ....|
00000070 00 38 4c 1e 53 11 00 0a 20 20 20 20 20 20 01 7d |.8L.S... .}|
00000080 02 03 16 b1 4b 01 02 03 06 07 11 12 13 15 16 04 |....K...........|
00000090 65 03 0c 00 10 00 01 1d 00 72 51 d0 1e 20 6e 28 |e........rQ.. n(|
000000a0 55 00 9a e6 10 00 00 1e 8c 0a d0 8a 20 e0 2d 10 |U........... .-.|
000000b0 10 3e 96 00 9a e6 10 00 00 18 8c 0a d0 90 20 40 |.>............ @|
000000c0 31 20 0c 40 55 00 9a e6 10 00 00 18 00 00 00 00 |1 .@U...........|
000000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 bc |................|
00000100
In order to force specific modes you could have a look at this:
And in this document you’ll find information about how to build the custom EDID binary.
Please let me know if this helps you,
Rafael Beims