My AMD-based laptop with Fedora 44 KDE couldn't connect an external monitor via HDMI

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1

I connect my laptop to the external monitor but It didn’t work (The monitor showed the message ‘no signal’.)

My laptop:

OS: Fedora Linux 44 (KDE Plasma Desktop Edition) x86_64
Host: ASUS EXPERTBOOK BM1403CDA (1.0)
Kernel: Linux 7.2.5-200.fc44.x86_64
Uptime: 8 mins
Packages: 90 (brew), 2241 (rpm)
Shell: oksh 7.9
Display (N140HCA-EAC): 1920x1080 in 14", 60 Hz [Built-in]

dmesg:

[ 78.983239] amdgpu 0000:04:00.0: [drm] *ERROR* Error queueing DMUB command: status=2
[ 78.983247] amdgpu 0000:04:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
[ 78.983497] amdgpu 0000:04:00.0: [drm] *ERROR* EDID CEA parser failed
[ 79.219170] amdgpu 0000:04:00.0: [drm] *ERROR* Error queueing DMUB command: status=2
[ 79.219177] amdgpu 0000:04:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
[ 79.219221] amdgpu 0000:04:00.0: [drm] *ERROR* EDID CEA parser failed
[ 79.219239] amdgpu 0000:04:00.0: [drm] Failed to setup vendor infoframe on connector HDMI-A-1: -22
[ 79.470584] amdgpu 0000:04:00.0: [drm] *ERROR* Error queueing DMUB command: status=2
[ 79.470592] amdgpu 0000:04:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data

The monitor: AOC model 5648, which I regularly use with Raspberry Pi OS.

The question is what should I do? (Or just wait for the next release).

Update: I decided to do nothing further and simply wait.

2

The error suggests that the EDID from the monitor is bad.

You can get the EDID from the kernel to investigate what it might be.

In /sys/class/drm look for the HDMI connection.
Then in that folder you should find a file named edid.

You can use the edid-decode program to decode the edid.
What does it report?

3

This sounds to me like the amdgpu problem several people have reported is newly broken in 7.2.5 and works in 7.2.4

Not to be confused with the different amdgpu problem I currently have myself, that is broken in 7.2.4 and working in 7.1.13

Anyway, I suggest trying an earlier kernel. Assuming you don’t have one to try, see my post (for that other amdgpu problem):

4

edid was found in /sys/devices/pci0000:00/0000:00:08.1/0000:04:00.0/drm/card1/card1-HDMI-A-1/edid. The result of edid-decode is as follow as:

edid-decode (hex):

00 ff ff ff ff ff ff 00 05 e3 10 16 f5 10 00 00
29 22 01 03 80 22 13 78 2a cb a5 95 5f 5b 98 27
24 50 54 23 08 00 d1 c0 b3 00 95 00 81 80 81 40
81 c0 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c
45 00 58 c2 10 00 00 1e 00 00 00 fd 00 30 4b 1e
55 12 00 0a 20 20 20 20 20 20 00 00 00 fc 00 31
36 54 31 30 0a 20 20 20 20 20 20 20 00 00 00 ff
00 41 58 54 31 34 34 31 5a 30 34 33 34 31 01 2b

02 03 20 f1 4b 10 1f 05 14 04 13 03 12 02 11 01
67 03 0c 00 10 00 00 3c 23 09 07 07 83 01 00 00
01 1d 00 72 51 d0 1e 20 6e 28 55 00 df 04 11 00
00 1e 8c 0a d0 8a 20 e0 2d 10 10 3e 96 00 df 04
11 00 00 18 8c 0a d0 90 20 40 31 20 0c 40 55 00
df 04 11 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 00 00 00 00 00 00 00 00 00 00 00 00 3a

Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: AOC
Model: 5648
Serial Number: 4341 (0x000010f5)
Made in: week 41 of 2024
Basic Display Parameters & Features:
Digital display
Maximum image size: 34 cm x 19 cm
Gamma: 2.20
DPMS levels: Off
RGB color display
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.5849, 0.3710
Green: 0.3574, 0.5966
Blue : 0.1542, 0.1425
White: 0.3134, 0.3291
Established Timings I & II:
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
DMT 0x08: 800x600 56.250000 Hz 4:3 35.156 kHz 36.000000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
Standard Timings:
DMT 0x52: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
DMT 0x3a: 1680x1050 59.954250 Hz 16:10 65.290 kHz 146.250000 MHz
DMT 0x2f: 1440x900 59.887445 Hz 16:10 55.935 kHz 106.500000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
DMT 0x20: 1280x960 60.000000 Hz 4:3 60.000 kHz 108.000000 MHz
DMT 0x55: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
Detailed Timing Descriptors:
DTD 1: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (344 mm x 194 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 4 Vsync 5 Vback 36 Vpol P
Display Range Limits:
Monitor ranges (GTF): 48-75 Hz V, 30-85 kHz H, max dotclock 180 MHz
Display Product Name: ‘16T10’
Display Product Serial Number: ‘AXT1441Z04341’
Extension blocks: 1
Checksum: 0x2b

Block 1, CTA-861 Extension Block:
Revision: 3
Underscans IT Video Formats by default
Basic audio support
Supports YCbCr 4:4:4
Supports YCbCr 4:2:2
Native detailed modes: 1
Video Data Block:
VIC 16: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz
VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz
VIC 5: 1920x1080i 60.000000 Hz 16:9 33.750 kHz 74.250000 MHz
VIC 20: 1920x1080i 50.000000 Hz 16:9 28.125 kHz 74.250000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz
VIC 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz
VIC 2: 720x480 59.940060 Hz 4:3 31.469 kHz 27.000000 MHz
VIC 17: 720x576 50.000000 Hz 4:3 31.250 kHz 27.000000 MHz
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
Vendor-Specific Data Block (HDMI), OUI 00-0C-03:
Source physical address: 1.0.0.0
Maximum TMDS clock: 300 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
Detailed Timing Descriptors:
DTD 2: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz (479 mm x 260 mm)
Hfront 110 Hsync 40 Hback 220 Hpol P
Vfront 5 Vsync 5 Vback 20 Vpol P
DTD 3: 720x480 59.940060 Hz 3:2 31.469 kHz 27.000000 MHz (479 mm x 260 mm)
Hfront 16 Hsync 62 Hback 60 Hpol N
Vfront 9 Vsync 6 Vback 30 Vpol N
DTD 4: 720x576 50.000000 Hz 5:4 31.250 kHz 27.000000 MHz (479 mm x 260 mm)
Hfront 12 Hsync 64 Hback 68 Hpol N
Vfront 5 Vsync 5 Vback 39 Vpol N
Checksum: 0x3a Unused space in Extension Block: 41 bytes

5

I installed Linux 7.1.3 via koji and dnf install ./kernel-*; however, it still got similar error messages to before downgrading, and the symptom still remains.

Kernel: Linux 7.1.13-200.fc44.x86_64

[ 98.255729] amdgpu 0000:04:00.0: [drm] *ERROR* Error queueing DMUB command: status=2
[ 98.255740] amdgpu 0000:04:00.0: [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data
[ 98.255780] amdgpu 0000:04:00.0: [drm] *ERROR* EDID CEA parser failed
[ 98.255820] amdgpu 0000:04:00.0: [drm] Failed to setup vendor infoframe on connector HDMI-A-1: -22
[ 98.585526] amdgpu 0000:04:00.0: [drm] *ERROR* Error queueing DMUB command: status=2

6

That EDID seems OK. The way forward is to report this as a bug in the amdgpu bug tracker.
Include the EDID in the bug report.