Following on from the comments on this post.
I have a small 2048×1536 screen. I’ve tried connecting it to a MacBook Neo, and a Surface Pro 7 via a USB C to HDMI dongle. I have identical results with more than one dongle of different designs, though its possible they are internally the same
On Windows on the Surface Pro the screen is able to reach its full resolution – the EDID dump (generated with DumpEDID) is as below, and it shows 2048 x 1536
*****************************************************************
Active : Yes
Registry Key : DISPLAYTYT64104&1bd78084&0&UID4162
Monitor Name : HDMI
Serial Number : HDMI
Manufacture Week : 25 / 2023
ManufacturerID : 13395 (0x3453)
ProductID : 25616 (0x6410)
Serial Number (Numeric) : 25616 (0x00006410)
EDID Version : 1.3
Display Gamma : 2.20
Vertical Frequency : 56 - 86 Hz
Horizontal Frequency : 30 - 113 KHz
Maximum Image Size : 60 X 34 cm (27.2 Inch)
Maximum Resolution : 2048 X 1536
Support Standby Mode : Yes
Support Suspend Mode : Yes
Support Low-Power Mode : Yes
Support Default GTF : No
Digital : Yes
Supported Display Modes :
720 X 400 70 Hz
640 X 480 60 Hz
640 X 480 75 Hz
800 X 600 60 Hz
800 X 600 75 Hz
1024 X 768 60 Hz
1024 X 768 75 Hz
1152 X 864 75 Hz
1200 X 960 60 Hz
1280 X 1024 60 Hz
1280 X 1024 75 Hz
1600 X 1200 60 Hz
1920 X 1200 60 Hz
2048 X 1536 60 Hz
Using BetterDisplay to dump out the EDID information on macOS, then translating the bin file it output with edid-decode I get the following
edid-decode (hex):
00 ff ff ff ff ff ff 00 53 34 10 64 10 64 00 00
19 21 01 03 80 3c 22 78 ee ee 91 a3 54 4c 99 26
0f 50 54 a5 4b 00 e1 40 d1 00 71 4f a9 40 81 80
77 80 01 01 01 01 14 50 00 96 80 00 09 60 30 20
35 00 55 50 21 00 00 1a 00 00 00 ff 00 48 44 4d
49 0a 20 20 20 20 20 20 20 20 00 00 00 fc 00 48
44 4d 49 0a 20 20 20 20 20 20 20 20 00 00 00 fd
00 38 56 1e 71 1e 00 0a 20 20 20 20 20 20 01 bc
02 03 28 f1 4f 10 04 04 03 02 04 04 01 04 1f 12
13 20 21 22 23 09 07 07 83 01 00 00 67 03 0c 00
10 00 38 3d e3 05 03 01 02 3a 80 18 71 38 2d 40
58 2c 25 00 55 50 21 00 00 1e 01 1d 80 18 71 1c
16 20 58 2c 25 00 55 50 21 00 00 1e 01 1d 00 72
51 d0 1e 20 6e 28 55 00 55 50 21 00 00 1e 8c 0a
d0 8a 20 e0 2d 10 10 3e 96 00 55 50 21 00 00 18
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f3
----------------
Block 0, Base EDID:
EDID Structure Version & Revision: 1.3
Vendor & Product Identification:
Manufacturer: TYT
Model: 25616
Serial Number: 25616
Made in: week 25 of 2023
Basic Display Parameters & Features:
Digital display
Maximum image size: 60 cm x 34 cm
Gamma: 2.20
DPMS levels: Standby Suspend Off
RGB color display
Default (sRGB) color space is primary color space
First detailed timing is the preferred timing
Color Characteristics:
Red : 0.6396, 0.3300
Green: 0.2998, 0.5996
Blue : 0.1503, 0.0595
White: 0.3125, 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 0x06: 640x480 75.000000 Hz 4:3 37.500 kHz 31.500000 MHz
DMT 0x09: 800x600 60.316541 Hz 4:3 37.879 kHz 40.000000 MHz
DMT 0x0b: 800x600 75.000000 Hz 4:3 46.875 kHz 49.500000 MHz
DMT 0x10: 1024x768 60.003840 Hz 4:3 48.363 kHz 65.000000 MHz
DMT 0x12: 1024x768 75.028582 Hz 4:3 60.023 kHz 78.750000 MHz
DMT 0x24: 1280x1024 75.024675 Hz 5:4 79.976 kHz 135.000000 MHz
Standard Timings:
GTF : 2048x1536 60.000000 Hz 4:3 95.340 kHz 266.952000 MHz
DMT 0x45: 1920x1200 59.884600 Hz 16:10 74.556 kHz 193.250000 MHz
DMT 0x15: 1152x864 75.000000 Hz 4:3 67.500 kHz 108.000000 MHz
DMT 0x33: 1600x1200 60.000000 Hz 4:3 75.000 kHz 162.000000 MHz
DMT 0x23: 1280x1024 60.019740 Hz 5:4 63.981 kHz 108.000000 MHz
GTF : 1200x960 60.000000 Hz 5:4 59.640 kHz 95.424000 MHz
Detailed Timing Descriptors:
DTD 1: 2048x1536 60.366735 Hz 4:3 93.267 kHz 205.000000 MHz (597 mm x 336 mm)
Hfront 48 Hsync 32 Hback 70 Hpol P
Vfront 3 Vsync 5 Vback 1 Vpol N
Display Product Serial Number: 'HDMI'
Display Product Name: 'HDMI'
Display Range Limits:
Monitor ranges (GTF): 56-86 Hz V, 30-113 kHz H, max dotclock 300 MHz
Extension blocks: 1
Checksum: 0xbc
----------------
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 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 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 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 1: 640x480 59.940476 Hz 4:3 31.469 kHz 25.175000 MHz
VIC 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz
VIC 31: 1920x1080 50.000000 Hz 16:9 56.250 kHz 148.500000 MHz
VIC 18: 720x576 50.000000 Hz 16:9 31.250 kHz 27.000000 MHz
VIC 19: 1280x720 50.000000 Hz 16:9 37.500 kHz 74.250000 MHz
VIC 32: 1920x1080 24.000000 Hz 16:9 27.000 kHz 74.250000 MHz
VIC 33: 1920x1080 25.000000 Hz 16:9 28.125 kHz 74.250000 MHz
VIC 34: 1920x1080 30.000000 Hz 16:9 33.750 kHz 74.250000 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: 1.0.0.0
DC_36bit
DC_30bit
DC_Y444
Maximum TMDS clock: 305 MHz
Colorimetry Data Block:
xvYCC601
xvYCC709
Reserved MD0
Detailed Timing Descriptors:
DTD 2: 1920x1080 60.000000 Hz 16:9 67.500 kHz 148.500000 MHz (597 mm x 336 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 2 Vsync 5 Vback 38 Vpol P
DTD 3: 1920x540 60.053381 Hz 32:9 33.750 kHz 74.250000 MHz (597 mm x 336 mm)
Hfront 88 Hsync 44 Hback 148 Hpol P
Vfront 2 Vsync 5 Vback 15 Vpol P
DTD 4: 1280x720 60.000000 Hz 16:9 45.000 kHz 74.250000 MHz (597 mm x 336 mm)
Hfront 110 Hsync 40 Hback 220 Hpol P
Vfront 5 Vsync 5 Vback 20 Vpol P
DTD 5: 720x480 59.940060 Hz 3:2 31.469 kHz 27.000000 MHz (597 mm x 336 mm)
Hfront 16 Hsync 62 Hback 60 Hpol N
Vfront 9 Vsync 6 Vback 30 Vpol N
Checksum: 0xf3
It shows the maximum resolution correctly but its not listed as a accepted resolution on macOS.
While I’m definitely interested in getting this to work (and setting the correct resolution didn’t work on better display… And is another question), I’m wondering why macOS isn’t detecting the display modes Windows is, and why I can’t set them?
