Graphics, sound and multimedia • Re: Raspberry Pi 2B with a 2048x1536 HDMI iPad screen only FullHD

Trying to get a Pi 2B working with a extracted iPad 4 screen connected via HDMI with a driver board. The panel resolution is 2048x1536, but despite all my efforts Pi only gives the maximum resolution of 1920x1080. Tested the driver board and the HDMI cable with a Windows PC and they work just fine, so the problem is the Pi. I'm using Bookworm with the vc4-fkms-v3d driver enabled. I've gone through many threads such as these:

viewtopic.php?t=24679
viewtopic.php?t=228128

I've gone through countless combinations of boot config permutations, but nothing seems to work. In my config I've had the following:

Code:

# Enable audio (loads snd_bcm2835)dtparam=audio=on# Additional overlays and parameters are documented# /boot/firmware/overlays/README# Automatically load overlays for detected camerascamera_auto_detect=1# Automatically load overlays for detected DSI displaysdisplay_auto_detect=1# Automatically load initramfs files, if foundauto_initramfs=1# Enable DRM VC4 V3D driverdtoverlay=vc4-fkms-v3dmax_framebuffers=2# Don't have the firmware create an initial video= setting in cmdline.txt.# Use the kernel's default instead.disable_fw_kms_setup=1# Disable compensation for displays with overscandisable_overscan=1# Run as fast as firmware / board allowsarm_boost=1hdmi_ignore_edid=0xa5000080hdmi_group=2             # Set to DMT (Display Monitor Timings)hdmi_mode=87             # Set to 87 for custom resolutionhdmi_force_mode=1#hdmi_cvt=2048 1536 60.366735 1 0 0 0hdmi_timings=2048 0 48 32 70 1536 0 3 5 1 0 0 0 60.366735 0 205000000 1boot_delay=5framebuffer_width=2048framebuffer_height=1536max_framebuffer_width=2048max_framebuffer_height=1536gpu_mem=64hdmi_pixel_freq_limit=205000000[cm4]# Enable host mode on the 2711 built-in XHCI USB controller.# This line should be removed if the legacy DWC2 controller is required# (e.g. for USB device mode) or if USB support is not required.otg_mode=1[cm5]dtoverlay=dwc2,dr_mode=host

As you can see, I've tried both hdmi_cvt and hdmi_timings. I received the timing values from running

Code:

edid-decode /sys/class/drm/card0-HDMI-A-1/edid

Which resulted in the following:

Code:

edid-decode (hex):00 ff ff ff ff ff ff 00 53 34 10 64 10 64 00 0019 21 01 03 80 3c 22 78 ee ee 91 a3 54 4c 99 260f 50 54 a5 4b 00 e1 40 d1 00 71 4f a9 40 81 8077 80 01 01 01 01 14 50 00 96 80 00 09 60 30 2035 00 55 50 21 00 00 1a 00 00 00 ff 00 48 44 4d49 0a 20 20 20 20 20 20 20 20 00 00 00 fc 00 4844 4d 49 0a 20 20 20 20 20 20 20 20 00 00 00 fd00 38 56 1e 71 1e 00 0a 20 20 20 20 20 20 01 bc02 03 28 f1 4f 10 05 04 03 02 07 16 01 14 1f 1213 20 21 22 23 09 07 07 83 01 00 00 67 03 0c 0010 00 38 3d e3 05 03 01 02 3a 80 18 71 38 2d 4058 2c 25 00 55 50 21 00 00 1e 01 1d 80 18 71 1c16 20 58 2c 25 00 55 50 21 00 00 9e 01 1d 00 7251 d0 1e 20 6e 28 55 00 55 50 21 00 00 1e 8c 0ad0 8a 20 e0 2d 10 10 3e 96 00 55 50 21 00 00 1800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 4d----------------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: 1Checksum: 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   5:  1920x1080i  60.000000 Hz  16:9     33.750 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   7:  1440x480i   59.940060 Hz  16:9     15.734 kHz     27.000000 MHz    VIC  22:  1440x576i   50.000000 Hz  16:9     15.625 kHz     27.000000 MHz    VIC   1:   640x480    59.940476 Hz   4:3     31.469 kHz     25.175000 MHz    VIC  20:  1920x1080i  50.000000 Hz  16:9     28.125 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:  1920x1080i  60.000000 Hz  16:9     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 Vfront +0.5 Odd Field                 Vfront    2 Vsync   5 Vback   15 Vpol P Vback  +0.5 Even Field    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 NChecksum: 0x4d

Am I missing something obvious why this should not work? Are the timing values correct? I couldn't figure out how the horizontal and vertical polarities are coded. Should they be 1 and -1 or 1 and 0? This guide suggested that they don't (probably) matter: https://learn.adafruit.com/using-weird- ... i?view=all

Statistics: Posted by aBUGSworstnightmare — Sun Nov 24, 2024 9:59 pm