AML GXL No Video on Monitor

Please use this thread to report no video issues on boards with the AML- model prefix.

  • AML-S905X-CC Le Potato
  • AML-S805X-AC La Frite
  • AML-S905D-PC Tartiflette

This device was designed for most standard resolution HDTVs and monitors. HDMI supports two modes:

  • CEA Consumer Electronics Association
  • DMI Digital Media Interface

Different video modes require proper clock generator and setup to create the appropriate synchronization frequencies with the display. This is a very complex topic beyond the scope of this post.

If you have a monitor that is not showing video, please post on this thread with the following information if possible:

  1. Monitor/TV Make and Model
  2. Native Resolution
  3. EDID Dump

It is not guaranteed that every monitor resolution is supported due to the limitations on the onboard clock generator. By reporting the issue, we can identify target clocks and resolutions to debug over time.

Model: Waveshare 11.9

Resolution: 320x1480

Edid:

edid-decode (hex):

00 ff ff ff ff ff ff 00 21 94 24 1f 0a 00 00 00
1c 1e 01 03 80 94 30 78 0a 0d c9 a0 57 47 98 27
12 48 4c 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 68 10 40 8d 10 c8 20 50 3c 17
04 04 80 38 74 00 00 18 c8 19 40 97 11 c8 20 50
59 04 04 44 80 38 74 00 00 18 00 00 00 fc 00 57
61 76 65 53 68 61 72 65 20 20 20 20 00 00 00 fd
00 14 78 01 ff 1d 00 0a 20 20 20 20 20 20 01 ee

02 03 1a 71 47 00 00 00 00 00 00 00 23 09 07 01
83 01 00 00 65 03 0c 00 10 00 c8 19 40 97 11 c8
20 50 59 04 04 44 80 38 74 00 00 18 c8 19 40 97
11 c8 20 50 59 04 04 44 80 38 74 00 00 18 c8 19
40 97 11 c8 20 50 59 04 04 44 80 38 74 00 00 18
c8 19 40 97 11 c8 20 50 59 04 04 44 80 38 74 00
00 18 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 45

----------------

Block 0, Base EDID:
  EDID Structure Version & Revision: 1.3
  Vendor & Product Identification:
    Manufacturer: HLT
    Model: 7972
    Serial Number: 10
    Made in: week 28 of 2020
  Basic Display Parameters & Features:
    Digital display
    Maximum image size: 148 cm x 48 cm
    Gamma: 2.20
    RGB color display
    First detailed timing is the preferred timing
  Color Characteristics:
    Red  : 0.6250, 0.3398
    Green: 0.2802, 0.5947
    Blue : 0.1552, 0.0703
    White: 0.2832, 0.2978
  Established Timings I & II: none
  Standard Timings: none
  Detailed Timing Descriptors:
    DTD 1:   320x1480   60.255483 Hz   8:37    91.106 kHz     42.000000 MHz (1920 mm x 1080 mm)
                 Hfront   60 Hsync  23 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
    DTD 2:   320x1480   60.042357 Hz   8:37    90.784 kHz     66.000000 MHz (1920 mm x 1080 mm)
                 Hfront  345 Hsync   4 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
    Display Product Name: 'WaveShare    '
    Display Range Limits:
      Monitor ranges (GTF): 20-120 Hz V, 1-255 kHz H, max dotclock 290 MHz
  Extension blocks: 1
Checksum: 0xee

----------------

Block 1, CTA-861 Extension Block:
  Revision: 3
  Basic audio support
  Supports YCbCr 4:4:4
  Supports YCbCr 4:2:2
  Native detailed modes: 1
  Video Data Block:
  Audio Data Block:
    Linear PCM:
      Max channels: 2
      Supported sample rates (kHz): 48 44.1 32
      Supported sample sizes (bits): 16
  Speaker Allocation Data Block:
    FL/FR - Front Left/Right
  Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
    Source physical address: 1.0.0.0
  Detailed Timing Descriptors:
    DTD 3:   320x1480   60.042357 Hz   8:37    90.784 kHz     66.000000 MHz (1920 mm x 1080 mm)
                 Hfront  345 Hsync   4 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
    DTD 4:   320x1480   60.042357 Hz   8:37    90.784 kHz     66.000000 MHz (1920 mm x 1080 mm)
                 Hfront  345 Hsync   4 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
    DTD 5:   320x1480   60.042357 Hz   8:37    90.784 kHz     66.000000 MHz (1920 mm x 1080 mm)
                 Hfront  345 Hsync   4 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
    DTD 6:   320x1480   60.042357 Hz   8:37    90.784 kHz     66.000000 MHz (1920 mm x 1080 mm)
                 Hfront  345 Hsync   4 Hback   58 Hpol N
                 Vfront   16 Vsync   4 Vback   12 Vpol N
Checksum: 0x45

Hi - my le potato boots but no video on this Samsung 4K HDTV. I’ve tried a variety of methods to force it to 1920x1080 but no luck. Perhaps you can help with this info.

Samsung Model un65ks900d
Native Resolution 3840x2160
EDID:
00ffffffffffff004c2d3b0d00060001
011a0103808e50780a23ada4544d9926
0f474abdef80714f81c0810081809500
a9c0b300010108e80030f2705a80b058
8a00501d7400001e023a801871382d40
582c4500501d7400001e000000fd0018
4b0f873c000a202020202020000000fc
0053414d53554e470a20202020200109
020350f05761101f041305142021225d
5e5f6065666263640716031229090707
1507503d04c083010000e2000fe305c3
016e030c002000b83c20008001020304
67d85dc401788003e3060d01e30f01e0
011d80d0721c1620102c2580501d7400
009e662156aa51001e30468f3300501d
7400001e0000000000000000000000b3

Hi, thanks for the redirect.

1 Model
onn. 24" 1080p VGA/HDMI 60hz FHD Monitor

2 Native resolution
1920 x 1080

3 EDID Dump

00000000: 00ff ffff ffff ff00 3dce 0101 0101 0101  ........=.......
00000010: 211d 0103 8034 2078 2aa5 c5a6 544f 9c23  !....4 x*...TO.#
00000020: 1250 54bf ef00 d1c0 b300 9500 8180 8140  .PT............@
00000030: 81c0 3140 b30f 023a 8018 7138 2d40 582c  ..1@...:..q8-@X,
00000040: 4500 0543 2100 001e 6621 56aa 5100 1e30  E..C!...f!V.Q..0
00000050: 468f 3300 0543 2100 001e 0000 00fd 0030  F.3..C!........0
00000060: 4c1e 5511 000a 2020 2020 2020 0000 00fc  L.U...      ....
00000070: 0031 3030 3030 3234 3837 0a20 2020 0175  .100002487.   .u
00000080: 0203 20b1 4b90 1f04 0302 0e1e 011f 1213  .. .K...........
00000090: 6703 0c00 1000 382d 8301 0000 e305 0301  g.....8-........
000000a0: 023a 8018 7138 2d40 582c 4500 0543 2100  .:..q8-@X,E..C!.
000000b0: 001e 011d 8018 711c 1620 582c 2500 0543  ......q.. X,%..C
000000c0: 2100 009e 011d 0072 51d0 1e20 6e28 5500  !......rQ.. n(U.
000000d0: 0543 2100 001e 8c0a d08a 20e0 2d10 103e  .C!....... .-..>
000000e0: 9600 0543 2100 0018 0000 0000 0000 0000  ...C!...........
000000f0: 0000 0000 0000 0000 0000 0000 0000 0005  ................

Best
William

There was a bug with our code handling of 4K60 displays on AML-S905X-CC. This should be fixed on the latest kernel. We will roll out new images over the weekend but for your existing install, you can connect to another display and run:

sudo apt update
sudo apt dist-upgrade

Looks like the 1080p monitor issue I was having is also fixed in this update (display works). Thanks for the help!

edit: might have spoke too soon. monitor is back to a black screen after boot. hmm…

That sounds like a cable or connector issue. Try disconnecting everything and then connecting everything back up and then powering up.

Any updates on this one? I’ve been trying a couple of things like changing some hdmi settings on the dts and building the bin with the libretech-builder-simple repo but nothing has really worked so far :confused:

This will take engineering time to figure out how to generate the timings necessary to support this display. Don’t expect this to be done in the next few weeks.

i swapped HDMI cables and the issue seems to have resolved. i hadn’t had issues with the original HDMI cable in the past. it is pretty old though, and i think i got it for free with the monitor.

best
William

This one works under linux but not under uboot.

Board: AML-S809X-AC La Frite

Monitor: Asus ROG Strix XG27AQ

Native: 2560 x 1440
Display indicates that it is running at 1920x1080 when under linux.

EDID:

00000000: 00ff ffff ffff ff00 06b3 6a27 0101 0101  ..........j'....
00000010: 191f 0103 803c 2278 eaff 45ac 5045 ac27  .....<"x..E.PE.'
00000020: 0c50 54bf ef00 714f 8180 9500 d1c0 d1e8  .PT...qO........
00000030: d1fc 0101 0101 565e 00a0 a0a0 2950 3020  ......V^....)P0 
00000040: 3500 5450 2100 001a 0000 00fd 0030 901e  5.TP!........0..
00000050: df3c 000a 2020 2020 2020 0000 00fc 0052  .<..      .....R
00000060: 4f47 2058 4732 3741 510a 2020 0000 00ff  OG XG27AQ.  ....
00000070: 004d 364c 4d51 5331 3138 3930 330a 01fc  .M6LMQS118903...
00000080: 0203 49f1 5090 0203 1112 1304 0e0f 1d1e  ..I.P...........
00000090: 221f 3f60 6123 0907 0783 0100 0067 030c  ".?`a#.......g..
000000a0: 0020 0038 4468 d85d c401 7880 0302 681a  . .8Dh.]..x...h.
000000b0: 0000 0101 2890 e6e3 05ff 01e6 0607 0173  ....(..........s
000000c0: 7300 e200 6ae3 0f00 609e e800 78a0 a067  s...j...`...x..g
000000d0: 5008 2098 0455 5021 0000 1a6f c200 a0a0  P. ..UP!...o....
000000e0: a055 5030 2035 0055 5021 0000 1a5a a000  .UP0 5.UP!...Z..
000000f0: a0a0 a046 5030 2035 0055 5021 0000 1acf  ...FP0 5.UP!....

fb under linux for good measure:

mode "1920x1080"
    geometry 1920 1080 1920 1080 32
    timings 0 0 0 0 0 0 0
    accel true
    rgba 8/16,8/8,8/0,0/0
endmode

parsed EDID also for good measure:

Section "Monitor"
        Identifier "ROG XG27AQ"
        ModelName "ROG XG27AQ"
        VendorName "AUS"
        # Monitor Manufactured week 25 of 2021
        # EDID version 1.3
        # Digital Display
        DisplaySize 600 340
        Gamma 2.20
        Option "DPMS" "true"
        Horizsync 30-223
        VertRefresh 48-144
        # Maximum pixel clock is 600MHz
        #Not giving standard mode: 1152x864, 75Hz
        #Not giving standard mode: 1280x1024, 60Hz
        #Not giving standard mode: 1440x900, 60Hz
        #Not giving standard mode: 1920x1080, 60Hz
        #Not giving standard mode: 1920x1080, 100Hz
        #Not giving standard mode: 1920x1080, 120Hz

        #Extension block found. Parsing...
#WARNING: I may have missed a mode (CEA mode 63)
#WARNING: I may have missed a mode (CEA mode 96)
#WARNING: I may have missed a mode (CEA mode 97)
        Modeline        "Mode 14" 595.50 2560 2568 2600 2680 1440 1465 1473 1543 +hsync -vsync 
        Modeline        "Mode 0" 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync 
        Modeline        "Mode 1" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
        Modeline        "Mode 2" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
        Modeline        "Mode 3" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
        Modeline        "Mode 4" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
        Modeline        "Mode 5" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync
        Modeline        "Mode 6" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
        Modeline        "Mode 7" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync
        Modeline        "Mode 8" 54.054 1440 1472 1596 1716 480 489 495 525 -hsync -vsync
        Modeline        "Mode 9" 54.054 1440 1472 1596 1716 480 489 495 525 -hsync -vsync
        Modeline        "Mode 10" 54.000 1440 1464 1592 1728 576 581 586 625 -hsync -vsync
        Modeline        "Mode 11" 54.000 1440 1464 1592 1728 576 581 586 625 -hsync -vsync
        Modeline        "Mode 12" 74.250 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
        Modeline        "Mode 13" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
        Modeline        "Mode 15" 497.75 2560 2608 2640 2720 1440 1443 1448 1525 +hsync -vsync 
        Modeline        "Mode 16" 410.50 2560 2608 2640 2720 1440 1443 1448 1510 +hsync -vsync 
        Modeline        "Mode 17" 37.91 0 0 818 0 0 3 23 0 
        Option "PreferredMode" "Mode 14"
EndSection