Received v14 boards with 24.0.2/4 - No HDMI

Canonical Ubuntu Ubuntu OS issues
21

Seems like modeline missing for this 1024x600, and possibly no output produced for 640x480 on this particular display, together with EDID was missinterpreted.

ubuntu@ubuntu:~$ export DISPLAY=:0
ubuntu@ubuntu:~$ xrandr
Screen 0: minimum 16 x 16, current 640 x 480, maximum 32767 x 32767
HDMI-A-1 connected 640x480+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
640x480 59.38*+
320x240 59.52
640x400 59.95
320x200 58.96
640x350 59.77
ubuntu@ubuntu:~$ modetest -c
trying to open device ‘i915’…failed
trying to open device ‘amdgpu’…failed
trying to open device ‘radeon’…failed
trying to open device ‘nouveau’…failed
trying to open device ‘vmwgfx’…failed
trying to open device ‘omapdrm’…failed
trying to open device ‘exynos’…failed
trying to open device ‘tilcdc’…failed
trying to open device ‘msm’…done
Connectors:
id encoder status name size (mm) modes encoders
32 31 connected HDMI-A-1 0x0 2 31
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
#1 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff0004721800db8d1020
                    0116010380000078086760a25a499e23
                    13505400000001010101010101010101
                    0101010101013c14005a41581e203020
                    360000000000001e0000001000000000
                    00000000000000000000000000fc004c
                    4e553038303031343231340a000000fd
                    003741232806000a20202020202001b2
                    02031660410123090707830100006703
                    0c002000800c00000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:

34 0 disconnected DP-1 0x0 0 33
props:
1 EDID:
flags: immutable blob
blobs:

            value:
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:
    35 subconnector:
            flags: immutable enum
            enums: Unknown=0 VGA=1 DVI-D=3 HDMI=11 DP=10 Wireless=18 Native=15
            value: 0

Where it is working properly:
108 106 connected HDMI-A-1 0x0 3 106
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 1024x600 60.02 1024 1072 1104 1370 600 603 609 630 51800 flags: phsync, pvsync; type: driver
#1 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
#2 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff0004721800db8d1020
                    0116010380000078086760a25a499e23
                    13505400000001010101010101010101
                    0101010101013c14005a41581e203020
                    360000000000001e0000001000000000
                    00000000000000000000000000fc004c
                    4e553038303031343231340a000000fd
                    003741232806000a20202020202001b2
                    02031660410123090707830100006703
                    0c002000800c00000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:
    35 scaling mode:
            flags: enum
            enums: None=0 Full=1 Center=2 Full aspect=3
            value: 0
    109 Broadcast RGB:
            flags: enum
            enums: Automatic=0 Full=1 Limited 16:235=2
            value: 0
    36 underscan:
            flags: enum
            enums: off=0 on=1 auto=2
            value: 0
    37 underscan hborder:
            flags: range
            values: 0 128
            value: 0
    38 underscan vborder:
            flags: range
            values: 0 128
            value: 0
    110 max bpc:
            flags: range
            values: 8 16
            value: 10
    111 content type:
            flags: enum
            enums: No Data=0 Graphics=1 Photo=2 Cinema=3 Game=4
            value: 1
    112 Colorspace:
            flags: enum
            enums: Default=0 BT709_YCC=2 opRGB=7 BT2020_RGB=9 BT2020_YCC=10
            value: 0
    7 HDR_OUTPUT_METADATA:
            flags: blob
            blobs:

            value:
    113 vrr_capable:
            flags: immutable range
            values: 0 1
            value: 0
    104 Content Protection:
            flags: enum
            enums: Undesired=0 Desired=1 Enabled=2
            value: 0
    105 HDCP Content Type:
            flags: enum
            enums: HDCP Type0=0 HDCP Type1=1
            value: 0
22

Attempted edid override to make 100% sure it’s error in display… It’s not:

ubuntu@ubuntu:~$ modetest -c
trying to open device ‘i915’…failed
trying to open device ‘amdgpu’…failed
trying to open device ‘radeon’…failed
trying to open device ‘nouveau’…failed
trying to open device ‘vmwgfx’…failed
trying to open device ‘omapdrm’…failed
trying to open device ‘exynos’…failed
trying to open device ‘tilcdc’…failed
trying to open device ‘msm’…done
Connectors:
id encoder status name size (mm) modes encoders
32 31 connected HDMI-A-1 0x0 2 31
modes:
index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
#0 640x480 60.00 640 656 752 800 480 490 492 525 25200 flags: nhsync, nvsync; type: driver
#1 640x480 59.94 640 656 752 800 480 490 492 525 25175 flags: nhsync, nvsync; type: driver
props:
1 EDID:
flags: immutable blob
blobs:

            value:
                    00ffffffffffff0004721800db8d1020
                    0116010380000078086760a25a499e23
                    13505400000001010101010101010101
                    0101010101013c14005a41581e203020
                    360000000000001e0000001000000000
                    00000000000000000000000000fc004c
                    4e553038303031343231340a000000fd
                    003741232806000a20202020202001b2
                    02031660410123090707830100006703
                    0c002000800c00000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000000
                    00000000000000000000000000000063
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:

34 0 disconnected DP-1 0x0 0 33
props:
1 EDID:
flags: immutable blob
blobs:

            value:
    2 DPMS:
            flags: enum
            enums: On=0 Standby=1 Suspend=2 Off=3
            value: 0
    5 link-status:
            flags: enum
            enums: Good=0 Bad=1
            value: 0
    6 non-desktop:
            flags: immutable range
            values: 0 1
            value: 0
    4 TILE:
            flags: immutable blob
            blobs:

            value:
    35 subconnector:
            flags: immutable enum
            enums: Unknown=0 VGA=1 DVI-D=3 HDMI=11 DP=10 Wireless=18 Native=15
            value: 0

Decoded EDID:

00 ff ff ff ff ff ff 00 04 72 18 00 db 8d 10 20
01 16 01 03 80 00 00 78 08 67 60 a2 5a 49 9e 23
13 50 54 00 00 00 01 01 01 01 01 01 01 01 01 01
01 01 01 01 01 01 3c 14 00 5a 41 58 1e 20 30 20
36 00 00 00 00 00 00 1e 00 00 00 10 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 fc 00 4c
4e 55 30 38 30 30 31 34 32 31 34 0a 00 00 00 fd
00 37 41 23 28 06 00 0a 20 20 20 20 20 20 01 b2

02 03 16 60 41 01 23 09 07 07 83 01 00 00 67 03
0c 00 20 00 80 0c 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 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
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 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 63

Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: ACR
Model: 24
Serial Number: 537955803
Made in: week 1 of 2012
Basic Display Parameters & Features:
Digital display
Image size is variable
Gamma: 2.20
RGB color display
Color Characteristics:
Red : 0.6337, 0.3535
Green: 0.2861, 0.6201
Blue : 0.1376, 0.0761
White: 0.3125, 0.3281
Established Timings I & II: none
Standard Timings: none
Detailed Timing Descriptors:
DTD 1: 1024x600 60.016221 Hz 128:75 37.810 kHz 51.800000 MHz
Hfront 48 Hsync 32 Hback 266 Hpol P
Vfront 3 Vsync 6 Vback 21 Vpol P
Dummy Descriptor:
Display Product Name: ‘LNU080014214’
Display Range Limits:
Monitor ranges (GTF): 55-65 Hz V, 35-40 kHz H, max dotclock 60 MHz
Extension blocks: 1
Checksum: 0xb2

Block 1, CTA-861 Extension Block:
Revision: 3
Basic audio support
Supports YCbCr 4:4:4
Native detailed modes: 0
Video Data Block:
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
Audio Data Block:
Linear PCM:
Max channels: 2
Supported sample rates (kHz): 48 44.1 32
Supported sample sizes (bits): 24 20 16
Speaker Allocation Data Block:
FL/FR - Front Left/Right
Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
Source physical address: 2.0.0.0
Supports_AI
Maximum TMDS clock: 60 MHz
Checksum: 0x63

23

look into contents of this structure in kernel:
static struct lt9611_mode lt9611_modes

it’s the root of missing modeline I believe

24

图片
图片383×363 21.8 KB

The configuration is already included in the patch; our R&D team will purchase the same panel for verification and further debugging.
May I confirm once again that the display which shows no HDMI output is the 1024 × 600, 10.1-inch model you bought?
If you could share the purchase link, we would be most grateful.

25

Hi,

I cannot find exactly same screen on amazon , mine was purchased on Polish portal Allegro.

Yet, I believe I found exactly the same on aliexpress (at least by format, connectors and chips placement)
https://pl.aliexpress.com/item/1005009760407483.html

The HDMI to LVDS converter in it is Lontium LT8619C

Michał

26

Thank you for sharing the information.

27

Dear @kinkin,
could you please share these files with me? because I can’t rich it now.
File：linux-image-…m64.deb
Link：查看分享
Password：mtq3
Expiry：2025-11-20 19:23:51

File：linux-module…m64.deb
Link：查看分享
Password：ddam
Expiry：2025-11-20 19:24:26
I also have problem with display via hdmi,
my board v02,
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.3 LTS
Release: 24.04
Codename: noble

28

The link has been updated. Could you please confirm the display resolution used to test HDMI OUT?
File：linux-image-…m64.deb
Link：查看分享
Password：4q0l
Expiry：2025-12-11 10:42:46

File：linux-module…m64.deb
Link：查看分享
Password：ob4m
Expiry：2025-12-11 10:43:00

If the new version does not resolve your issue, kindly share the detailed specifications of the monitor (or a purchase link), and provide the dmesg log capturing the HDMI no-output condition.

29

Dear @kinkin ,
Thank you very much, it works :handshake:! Display Asus VG27AQ resolution 2560x1440

30

Good news! Thank you for your response. :smiling_face_with_three_hearts: