How to get monitor detected as 1280x800?

Autonomous Machines Jetson & Embedded Systems Jetson TX2
21

Edid from the device:

00 ff ff ff ff ff ff 00 4a 8b 54 4c 01 00 00 00
 0c 11 01 03 81 46 27 78 8a a5 8e a6 54 4a 9c 26
 12 45 46 af cf 00 95 00 95 0f 95 19 01 01 01 01
 01 01 01 01 01 01 01 1d 00 72 51 d0 1e 20 6e 28
 55 00 b9 88 21 00 00 1e 8c 0a d0 8a 20 e0 2d 10
 10 3e 96 00 b9 88 21 00 00 18 00 00 00 fd 00 32
 4b 18 3c 0b 00 0a 20 20 20 20 20 20 00 00 00 fc
 00 33 32 56 33 48 2d 48 36 41 0a 20 20 20 01 29
 02 03 21 71 4e 06 07 02 03 15 96 11 12 13 04 14
 05 1f 90 23 09 07 07 83 01 00 00 65 03 0c 00 10
 00 8c 0a d0 90 20 40 31 20 0c 40 55 00 b9 88 21
 00 00 18 01 1d 80 18 71 1c 16 20 58 2c 25 00 b9
 88 21 00 00 9e 01 1d 80 d0 72 1c 16 20 10 2c 25
 80 b9 88 21 00 00 9e 01 1d 00 bc 52 d0 1e 20 b8
 28 55 40 b9 88 21 00 00 1e 02 3a 80 d0 72 38 2d
 40 10 2c 45 80 b9 88 21 00 00 1e 00 00 00 00 d0

It decodes to this:

Extracted contents:
header:          00 ff ff ff ff ff ff 00
serial number:   4a 8b 54 4c 01 00 00 00 0c 11
version:         01 03
basic params:    81 46 27 78 8a
chroma info:     a5 8e a6 54 4a 9c 26 12 45 46
established:     af cf 00
standard:        95 00 95 0f 95 19 01 01 01 01 01 01 01 01 01 01
descriptor 1:    01 1d 00 72 51 d0 1e 20 6e 28 55 00 b9 88 21 00 00 1e
descriptor 2:    8c 0a d0 8a 20 e0 2d 10 10 3e 96 00 b9 88 21 00 00 18
descriptor 3:    00 00 00 fd 00 32 4b 18 3c 0b 00 0a 20 20 20 20 20 20
descriptor 4:    00 00 00 fc 00 33 32 56 33 48 2d 48 36 41 0a 20 20 20
extensions:      01
checksum:        29

Manufacturer: RTK Model 4c54 Serial Number 1
Made week 12 of 2007
EDID version: 1.3
Digital display
DFP 1.x compatible TMDS
Maximum image size: 70 cm x 39 cm
Gamma: 2.20
DPMS levels: Standby
Supported color formats: RGB 4:4:4, YCrCb 4:2:2
First detailed timing is preferred timing
Established timings supported:
  720x400@70Hz
  640x480@60Hz
  640x480@72Hz
  640x480@75Hz
  800x600@56Hz
  800x600@60Hz
  800x600@72Hz
  800x600@75Hz
  1024x768@60Hz
  1024x768@70Hz
  1024x768@75Hz
  1280x1024@75Hz
Standard timings supported:
  1440x900@60Hz
  1440x900@75Hz
  1440x900@85Hz
Detailed mode: Clock 74.250 MHz, 697 mm x 392 mm
               1280 1390 1430 1650 hborder 0
                720  725  730  750 vborder 0
               +hsync +vsync
Detailed mode: Clock 27.000 MHz, 697 mm x 392 mm
                720  736  798  858 hborder 0
                480  489  495  525 vborder 0
               -hsync -vsync
Monitor ranges (GTF): 50-75Hz V, 24-60kHz H, max dotclock 110MHz
Monitor name: 32V3H
Has 1 extension blocks
Checksum: 0x29 (valid)
EDID block does NOT conform to EDID 1.3!
        Detailed block string not properly terminated

When I add the 1280x800 EDID to edid-generator, here’s what I get:

nvidia@tegra-ubuntu:~/edid-generator$ ls -l 1280x800.bin
-rw-rw-r-- 1 nvidia nvidia 134 May  4 00:11 1280x800.bin
nvidia@tegra-ubuntu:~/edid-generator$ edid-decode 1280x800.bin
Extracted contents:
header:          00 ff ff ff ff ff ff 00
serial number:   31 d8 00 00 00 00 00 00 00 00
version:         00 00
basic params:    05 16 01 03 6d
chroma info:     21 14 78 ea 5e c0 a4 59 4a 98
established:     25 20 50
standard:        54 0f 0f 0f 81 00 01 01 01 01 01 01 01 01 01 01
descriptor 1:    01 01 01 01 9e 20 00 00 00 90 51 20 1f 30 48 80 36 00
descriptor 2:    4d d0 10 00 00 1e 00 00 00 ff 00 4c 69 6e 75 78 20 23
descriptor 3:    30 0a 20 20 20 20 00 00 00 fd 00 3b 3d 30 32 09 00 0a
descriptor 4:    20 20 20 20 20 20 00 00 00 fc 00 31 32 38 30 78 38 30
extensions:      30
checksum:        0a

Manufacturer: LNX Model 0 Serial Number 0
EDID version: 0.0
Analog display, Input voltage level: 0.7/0.3 V
Sync: Composite Serration
Maximum image size: 22 cm x 1 cm
Gamma: 1.03
DPMS levels: Suspend Off
RGB color display
Default (sRGB) color space is primary color space
Supports GTF timings within operating range
Established timings supported:
  640x480@60Hz
  640x480@75Hz
  800x600@60Hz
  832x624@75Hz
Standard timings supported:
  920x920@75Hz
  368x368@75Hz
  1280x1280@60Hz
Detailed mode: Clock 2.570 MHz, 1055 mm x 2096 mm
               2305 2305 2961 5890 hborder 128
                 32   37   38   32 vborder 54
               -hsync -vsync analog composite
Detailed mode: Clock 533.250 MHz, 1897 mm x 1390 mm
                 16  272  527   16 hborder 120
                 30   78   78   30 vborder 32
               +hsync -vsync analog composite interleaved right even
Detailed mode: Clock 26.080 MHz, 829 mm x 560 mm
                544  544 1565  576 hborder 9
                 32   64  112   32 vborder 0
               +hsync -vsync bipolar analog composite
Detailed mode: Clock 82.240 MHz, 818 mm x 56 mm
                544  544 1564  576 hborder 120
                 32   32   48   32 vborder 56
               -hsync -vsync digital composite field sequential L/R
Has 48 extension blocks
Checksum: 0xa (should be 0x54)
EDID block does not conform at all!
        Block has broken checksum
        Bad year of manufacture

This is total nonsense! Presumably, the horrible hack piping macros through the assembler to generate binary layout files breaks with the ARM assembler instead of the presumed x86 assembler.

I’m this >< close to just writing my own EDID descriptor from scratch…

Unless there’s an edid generator that’s, like, not a total, utter hack, somewhere?

22

According to http://www.edidreader.com your existing EDID is valid. I wish I knew which exact piece of software is saying “EDID does not conform” (it may be more than one software location which does not like an extension), but from what I can see it shouldn’t be saying this.

One thing useful to know is that the first block is the original DDC and contains modes which were part of earlier monitors prior to wide screen (think 640x480 or 800x600). DDC blocks should always be valid and always be readable. Extensions are based on some newer monitor formats, e.g., I think the first EDID extension to DDC is when 1080p was added. Further extensions are added for newer modes like Ultra-High Def. If the modes are being parsed under a standard which predates one of the extensions then it would be normal to ignore the newer modes from a standard the video card does not support (perhaps without even complaining…unknown mode blocks should be ignored and not generate an error which stops parsing). The TX2 though should support even UHD, and the modes listed at edidreader.com should all succeed on a JTX2.

EDID is used to automatically fill in sections of the xorg.conf file via hotplug, in RAM, without writing any permanent file. It may be possible you can rewrite EDID in a way that gets this process working, but if that isn’t the case, you can choose to set Xorg to ignore EDID and manually fill in modelines within xorg.conf. You’d need details on your monitor timings. If you are interested in that, this is an example modeline generator you may find useful:
[url]https://arachnoid.com/modelines/[/url]

23

Yes, it is a “valid” EDID, but it does not expose the native mode of the panel.
This is quite likely because of cut-rate Chinese manufacturing practices.
You will note that it claims to be a 37" TV, but it’s actually a 7" IPS monitor.
This is all already mentioned earlier in the thread.

I appreciate your attempt to help. However, to save yourself some time, I suggest you read through this thread in a little more detail, because I tried exactly that, and the output is documented further up in this thread.
Trying to provide a modeline, and telling the driver to not require the format to be in the EDID fails, because the driver claims that the “AllowNonEDIDModes” option is unknown.

24

Hi snarky,

current display driver only supports mode indicated in edid. As a result, if there is no such resolution in you display edid. It won’t appear.

If you could build the kernel, there is a way that can hack a valid edid in kernel.

25

I really want to stay stock if I can.
Are you saying that the driver won’t recognize the “CustomEDID” option?

26

After a few false starts, I think I found an EDID editor that will actually work. The Phoenix EDID editor doesn’t work with extensions and the linux ones failed in various other ways when I tried to use them. One that appears to work is the “Analog Way” editor. Their editor is free and can be downloaded from www.analogway.com (Windows/MacOS) and via:

Support->downloads->AW EDID Editor

and then Software->AW EDID Editor for Windows [or MacOS]

To load the EDID, I had modified the original you posted into this format and saved this as “edid.dat”:

EDID BYTES:
0x   00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
    ------------------------------------------------
00 | 00 ff ff ff ff ff ff 00 4a 8b 54 4c 01 00 00 00
10 | 0c 11 01 03 81 46 27 78 8a a5 8e a6 54 4a 9c 26
20 | 12 45 46 af cf 00 95 00 95 0f 95 19 01 01 01 01
30 | 01 01 01 01 01 01 01 1d 00 72 51 d0 1e 20 6e 28
40 | 55 00 b9 88 21 00 00 1e 8c 0a d0 8a 20 e0 2d 10
50 | 10 3e 96 00 b9 88 21 00 00 18 00 00 00 fd 00 32
60 | 4b 18 3c 0b 00 0a 20 20 20 20 20 20 00 00 00 fc
70 | 00 33 32 56 33 48 2d 48 36 41 0a 20 20 20 01 29
80 | 02 03 21 71 4e 06 07 02 03 15 96 11 12 13 04 14
90 | 05 1f 90 23 09 07 07 83 01 00 00 65 03 0c 00 10
A0 | 00 8c 0a d0 90 20 40 31 20 0c 40 55 00 b9 88 21
B0 | 00 00 18 01 1d 80 18 71 1c 16 20 58 2c 25 00 b9
C0 | 88 21 00 00 9e 01 1d 80 d0 72 1c 16 20 10 2c 25
D0 | 80 b9 88 21 00 00 9e 01 1d 00 bc 52 d0 1e 20 b8
E0 | 28 55 40 b9 88 21 00 00 1e 02 3a 80 d0 72 38 2d
F0 | 40 10 2c 45 80 b9 88 21 00 00 1e 00 00 00 00 d0

Then in the program, I could use Tool->Import to import this .dat file. If you go to Tool->Hexa Viewer, you can see it has the correct hex. Then I exported with Tool->Export and checked to make sure it made the same file as output without losing anything. It looks correct. So, it looks like this editor can read/write that EDID file. One nice feature the program is is the Hexa Viewer page (not the Tool->Hexa Viewer) where I can click on any of the hex and see what section it decodes to, for the basic blocks, anyway.

27

How would I go about doing that? i’m having a similar problem with a jetson nano not being able to read my display’s EDID properly and i’ll try anything i need to do to get it to work, because this specific display is the only one I can use for my project

28

colec518,

Please file your topic on jetson Nano board. Thanks