This EDID is from a Lenovo P32p-20 4k monitor connected to a ThinkPad P16v Gen 2 laptop (Intel 155H). On other laptops (older thinkpads and macbooks) it works at 4k@60hz but on newer Intel ThinkPads including P16vG2 & X1 Carbon Gen 12 it only works at 4k@30hz. On Windows 11 I can select 59.95hz but then the resolution drops to 2560x1440. Going back to 4k reverts to 30hz. I originally suspected a flakey EDID or Linux decoding it but now I suspect the Intel/ThinkPad hardware. I note it says "EDID conformity: FAIL". The laptop's built-in panel (eDP-1) correctly shows "3840x2400 59.98*" but the external Lenovo monitor (DP-4) only goes to 30hz according to xrandr. OS is OpenSUSE w/KDE + Wayland however I think the desktop environment is unrelated because it's a kernel issue decoding the available modes, right?
edid-decode (hex):
00 ff ff ff ff ff ff 00 30 ae a2 62 00 00 00 00
1c 1e 01 04 b5 46 27 78 3a e5 a5 ae 4f 43 ab 26
0c 50 54 a1 08 00 d1 00 d1 c0 b3 00 81 c0 81 80
95 00 a9 c0 81 00 4d d0 00 a0 f0 70 3e 80 30 20
35 00 b9 88 21 00 00 1a 00 00 00 fd 00 17 4c 1e
a0 3c 01 0a 20 20 20 20 20 20 00 00 00 fc 00 4c
45 4e 20 50 33 32 70 2d 32 30 0a 20 00 00 00 ff
00 56 4e 41 34 59 35 33 52 0a 20 20 20 20 01 b7
02 03 1b f1 4e 61 60 5f 10 1f 05 14 04 13 12 11
03 02 01 23 09 7f 07 83 01 00 00 a3 66 00 a0 f0
70 1f 80 30 20 35 00 b9 88 21 00 00 1a 56 5e 00
a0 a0 a0 29 50 30 20 35 00 b9 88 21 00 00 1a 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 0c
----------------
Block 0, Base EDID:
EDID Structure Version & Revision: 1.4
Vendor & Product Identification:
Manufacturer: LEN
Model: 25250
Made in: week 28 of 2020
Basic Display Parameters & Features:
Digital display
Bits per primary color channel: 10
DisplayPort interface
Maximum image size: 70 cm x 39 cm
Gamma: 2.20
DPMS levels: Off
Supported color formats: RGB 4:4:4, YCrCb 4:4:4, YCrCb 4:2:2
First detailed timing includes the native pixel format and preferred refresh rate
Color Characteristics:
Red : 0.6826, 0.3105
Green: 0.2626, 0.6689
Blue : 0.1503, 0.0488
White: 0.3134, 0.3291
Established Timings I & II:
IBM : 720x400 70.081663 Hz 9:5 31.467 kHz 28.320000 MHz
DMT 0x04: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 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 0x45: 1920x1200 59.884600 Hz 16:10 74.556 kHz 193.250000 MHz
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 0x55: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
DMT 0x2f: 1440x900 59.887445 Hz 16:10 55.935 kHz 106.500000 MHz
DMT 0x53: 1600x900 60.000000 Hz 16:9 60.000 kHz 108.000000 MHz (RB)
DMT 0x1c: 1280x800 59.810326 Hz 16:10 49.702 kHz 83.500000 MHz
Detailed Timing Descriptors:
DTD 1: 3840x2160 59.996625 Hz 16:9 133.312 kHz 533.250000 MHz (697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 54 Vpol N
Display Range Limits:
Monitor ranges (Bare Limits): 23-76 Hz V, 30-160 kHz H, max dotclock 600 MHz
Display Product Name: 'LEN P32p-20'
Display Product Serial Number: 'VNA4Y53R'
Extension blocks: 1
Checksum: 0xb7
----------------
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 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz
VIC 96: 3840x2160 50.000000 Hz 16:9 112.500 kHz 594.000000 MHz
VIC 95: 3840x2160 30.000000 Hz 16:9 67.500 kHz 297.000000 MHz
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 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz
VIC 17: 720x576 50.000000 Hz 4:3 31.250 kHz 27.000000 MHz
VIC 3: 720x480 59.940060 Hz 16:9 31.469 kHz 27.000000 MHz
VIC 2: 720x480 59.940060 Hz 4:3 31.469 kHz 27.000000 MHz
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): 192 176.4 96 88.2 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: 3840x2160 29.980602 Hz 16:9 65.688 kHz 262.750000 MHz (697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 23 Vpol N
DTD 3: 2560x1440 59.950550 Hz 16:9 88.787 kHz 241.500000 MHz (697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 33 Vpol N
Checksum: 0x0c
----------------
Preferred Video Timing if only Block 0 is parsed:
DTD 1: 3840x2160 59.996625 Hz 16:9 133.312 kHz 533.250000 MHz (697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 54 Vpol N
----------------
Preferred Video Timings if Block 0 and CTA-861 Blocks are parsed:
DTD 1: 3840x2160 59.996625 Hz 16:9 133.312 kHz 533.250000 MHz (697 mm x 392 mm)
Hfront 48 Hsync 32 Hback 80 Hpol P
Vfront 3 Vsync 5 Vback 54 Vpol N
VIC 97: 3840x2160 60.000000 Hz 16:9 135.000 kHz 594.000000 MHz
Hfront 176 Hsync 88 Hback 296 Hpol P
Vfront 8 Vsync 10 Vback 72 Vpol P
----------------
Native Video Resolution:
3840x2160
----------------
edid-decode SHA: 84ddf9155376 2021-10-03 10:37:45
Warnings:
EDID:
Base EDID: Some timings are out of range of the Monitor Ranges:
Horizontal Freq: 28.125 - 135.000 kHz (Monitor: 30.000 - 160.000 kHz)
Failures:
Block 1, CTA-861 Extension Block:
Missing VCDB, needed for Set Selectable RGB Quantization to avoid interop issues.
EDID conformity: FAIL
$ xrandr
Screen 0: minimum 16 x 16, current 10561 x 3780, maximum 32767 x 32767
eDP-1 connected primary 3840x2400+0+1379 (normal left inverted right x axis y axis) 344mm x 215mm
3840x2400 59.98*+
2048x1536 59.95
1920x1440 59.97
1600x1200 59.96
1440x1080 59.99
1400x1050 59.98
1280x1024 59.89
1280x960 59.94
1152x864 59.96
1024x768 59.92
800x600 59.86
640x480 59.38
320x240 59.52
2560x1600 59.99
1920x1200 59.96
1680x1050 59.95
1440x900 59.89
1280x800 59.81
1152x720 59.97
960x600 59.96
928x580 59.88
800x500 59.50
768x480 59.90
720x480 59.71
640x400 59.95
320x200 58.96
3840x2160 60.00
3200x1800 59.99
2880x1620 60.00
2560x1440 59.96
2048x1152 59.98
1920x1080 59.96
1600x900 59.95
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
DP-4 connected 6720x3780+3841+0 (normal left inverted right x axis y axis) 697mm x 392mm
6720x3780 29.99*+
2048x1536 29.95
1920x1440 29.95
1600x1200 29.95
1440x1080 29.86
1400x1050 29.98
1280x1024 29.90
1280x960 29.82
1152x864 29.92
1024x768 29.89
800x600 29.55
640x480 29.85
320x240 27.50
2560x1600 29.99
1920x1200 29.95
1680x1050 29.95
1440x900 29.91
1280x800 29.83
1152x720 29.96
960x600 29.86
928x580 29.64
800x500 29.53
768x480 29.64
720x480 29.25
640x400 29.58
320x200 26.53
5120x2880 29.99
4096x2304 29.99
3840x2160 29.98
3200x1800 29.96
2880x1620 29.96
2560x1440 29.94
2048x1152 29.94
1920x1080 29.95
1600x900 29.92
1368x768 29.94
1280x720 29.93
1024x576 29.84
864x486 29.50
720x400 29.51
640x350 29.03
