HDMI output blank / unblank

Hello
I encounter last time issue with HDMI.
After some time my TX2 platform started to blink monitor connected on HDMI.
Board is staring to the moment when X dektop should appear on screen, but instead monitor is starting to blink.
What I can see:
Extcon AUX1(HDMI) disable
[ 29.522203] tegra_nvdisp_handle_pd_disable: Powergated Head2 pd
[ 29.522276] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 29.522843] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 29.522967] tegradc 15210000.nvdisplay: unblank
[ 29.523722] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 29.523805] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 29.523879] tegra_nvdisp_handle_pd_enable: Unpowergated Head2 pd
[ 29.525111] Parent Clock set for DC plld2
[ 29.530025] tegradc 15210000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 29.531213] tegradc 15210000.nvdisplay: hdmi: get RGB quant from EDID.
[ 29.531220] tegradc 15210000.nvdisplay: hdmi: get YCC quant from EDID.
[ 29.569052] extcon-disp-state external-connection:disp-state: cable 47 state 1
[ 29.569054] Extcon AUX1(HDMI) enable
[ 29.569114] tegradc 15210000.nvdisplay: unblank
[ 30.676565] tegradc 15210000.nvdisplay: blank - powerdown
[ 30.734820] extcon-disp-state external-connection:disp-state: cable 47 state 0
[ 30.734823] Extcon AUX1(HDMI) disable
[ 30.753321] tegra_nvdisp_handle_pd_disable: Powergated Head2 pd
[ 30.753404] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 30.754100] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 30.760947] tegradc 15210000.nvdisplay: blank - powerdown
[ 30.760971] tegradc 15210000.nvdisplay: unblank
[ 30.761715] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 30.761857] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 30.761934] tegra_nvdisp_handle_pd_enable: Unpowergated Head2 pd
[ 30.763133] Parent Clock set for DC plld2
[ 30.765813] tegradc 15210000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 30.766986] tegradc 15210000.nvdisplay: hdmi: get RGB quant from EDID.
[ 30.766993] tegradc 15210000.nvdisplay: hdmi: get YCC quant from EDID.
[ 30.803899] extcon-disp-state external-connection:disp-state: cable 47 state 1
[ 30.803902] Extcon AUX1(HDMI) enable
Any hint what’s the problem ?

Is this on a custom board or NV devkit?

This is on custom board. But getting ahead you questions :). This board was working correctly with monitor and TV. I was able to pass installation process after flashing, and was using it to gstreamer runs. So this is for sure not the board issue.

I have nothing to clarify for your board. I just want to ask if you could use NV devkit to reproduce this problem.

Also, does that dmesg keep printing forever in the serial console or it stops but monitor is still blinking?

Yes, dmesg is printing forever and in the same time is blinking.

There is no update from you for a period, assuming this is not an issue anymore.
Hence, we are closing this topic. If need further support, please open a new one.
Thanks

Could you share me the /var/log/xorg.0.log when this issue happened?