LibreELEC 9.1.502 attempting to drive tv @ 13Hz

Hardware spec:

Raspberry Pi 4B 4GB

LibreElec version: LibreELEC 9.2 Beta 2 (9.1.502)

Log file attached

I updated the Raspberry Pi to the latest firmware (Oct 4 2019 15:15:29) via the kodi interface.

All works fine when connected via HDMI to a computer monitor.

When connected to my Sony A1 tv (TV spec), the LibreELEC logo displays when booting, then the TV switches to 4096x2160 @ 13Hz (according to the overlay text) and the display goes blank.

I ran

/opt/vc/bin/tvservice -m CEA

which gave the output:

Group CEA has 1 modes:

(prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

I tried adding the following to config.txt:

hdmi_group=1

hdmi_mode=16

hdmi_force_mode=1

It seems to use that setting when booting then after the LibreELEC logo has displayed the TV still switches to 4096x2160 @ 13Hz and the display goes blank again.

I have tried using the resolution whitelisting within Kodi to just allow 1920x1080 @ 60Hz, but it made no difference.

Output of dmesg attached,

'lspci' gave command not found.

Output of lsusb isattached.

Any suggestions?

Same TV works perfectly with LibreELEC on a raspberry pi 3B.

Just updated LibreELEC to 9.2.1 and still have exactly the same issue. LibreELEC is currently unusable for me on the Raspberry Pi 4.

Pleased to say I was able to get it working with some help from this thread.

Latest output from
/opt/vc/bin/tvservice -m DMT

is:

Group DMT has 20 modes:
           mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive
           mode 5: 640x480 @ 72Hz 4:3, clock:31MHz progressive
           mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive
           mode 8: 800x600 @ 56Hz 4:3, clock:36MHz progressive
           mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive
           mode 10: 800x600 @ 72Hz 4:3, clock:50MHz progressive
           mode 11: 800x600 @ 75Hz 4:3, clock:49MHz progressive
           mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive
           mode 17: 1024x768 @ 70Hz 4:3, clock:75MHz progressive
           mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive
           mode 21: 1152x864 @ 75Hz 4:3, clock:108MHz progressive
           mode 28: 1280x800 @ 60Hz 16:10, clock:83MHz progressive
           mode 32: 1280x960 @ 60Hz 4:3, clock:108MHz progressive
           mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive
           mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive
           mode 47: 1440x900 @ 60Hz 16:10, clock:106MHz progressive
           mode 48: 1440x900 @ 75Hz 16:10, clock:136MHz progressive
           mode 51: 1600x1200 @ 60Hz 4:3, clock:162MHz progressive
           mode 58: 1680x1050 @ 60Hz 16:10, clock:146MHz progressive
           mode 88: 3840x2160 @ 15Hz 16:9, clock:158MHz progressive

This is the settings I put in config.txt to get it working:

disable_overscan=1
hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=88
hdmi_cvt 3840 2160 15
config_hdmi_bo*st=7
framebuffer_width=3840
framebuffer_height=2160

Note the typo in "config_hdmi_bo*st" - the forum is censoring that word for some reason.