Troubleshooting • Raspberry Pi 5 8GB - Can't choose 4k 60Hz refresh rate

TLDR: Raspberry Pi 5 (8GB) Fails to Output 4K@60Hz to Gigabyte M28U Monitor via HDMI 2.0

Hardware Setup:
- Raspberry Pi 5 (8GB RAM)
- Monitor: Gigabyte M28U
- HDMI Cable: HDMI to Micro HDMI - Certified HDMI 2.0
- OS: Raspberry Pi OS Bookworm (fully updated, kernel 6.6.20)

Issue:
After configuring `/boot/firmware/config.txt` and validating EDID support for 4K@60Hz, the Pi 5 still outputs **3840x2160@30Hz** instead of 60Hz.

Steps Already Taken:
1. Forced 4K@60Hz in `config.txt`:

hdmi_enable_4kp60=1
hdmi_group=1
hdmi_mode=97
hdmi_force_mode=1
hdmi_drive=2
config_hdmi_boost=7

2. EDID Validation:
- Monitor’s EDID explicitly lists `3840x2160@60Hz` (DTD 1 and VIC 97).
- EDID override attempted via `dtoverlay=edid,edid=...` with no success.
3. Firmware/OS Updates:
- Updated bootloader (`rpi-eeprom-update -a`) and packages.
- Tested LibreELEC nightly builds (same issue).
4. Cable/Port Checks:**
- Confirmed HDMI 0 port (Pi 5) and HDMI 2.1 port (M28U) are used.
- Tested multiple certified HDMI 2.0/2.1 cables.

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Diagnostic Outputs:
1. `modetest` Output (No 60Hz Mode):
#0 3840x2160 30.00 3840 4016 4104 4400 2160 2168 2178 2250 297000 flags: phsync, pvsync; type: driver
2. EDID Excerpt (via `edid-decode`)
DTD 1: 3840x2160 60.000000 Hz (594.000 MHz)
VIC 97: 3840x2160 60.000000 Hz (HDMI 2.0)

Could please someone suggest a reason on why I can't use 60Hz in this setup?

Statistics: Posted by malanga — Sun Feb 23, 2025 12:29 am — Replies 0 — Views 58

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