After a period of time (from a few minutes to dozens of minutes), the HDMI display of the module will be temporarily black for a while and then recover. What is the reason? This phenomenon has been found for a long time. It was thought that there was a single module failure or a software installation problem. Recently, several new modules + carrier systems have been applied, and no application software has been installed. It is found that there is a similar phenomenon. Each time the screen is short black for less than 1 second, the screen is closed regularly and the system automatically locks the screen. The display should be always on


Is it monitor power saving function? Our sdk enables the power saving by default. You should notice this if you have NV devkit.

What is the default power saving function? I have turned off auto sleep


  1. Do you enable the gnome desktop?

  2. Do you see this issue on devkit?

Novice one, what are the two problems you mentioned and where to find them


Nothing needs to be found. Let me ask them again in more simpler way…

  1. Do you see ubuntu desktop after you boot up or you see the console?
  2. Devkit means the nvidia development carrier board.

The burning system is NVIDIA’s, Ubuntu 18.04 interface

And can you see such issue if you change the module to nvidia devkit? Do you have nvidia devkit?

We need to figure out what environment would hit this problem.

There is no kit
,If there is no package, the screen of electronic equipment is turned off regularly, and the screen of automatic lock of the system is turned off. The display should be always on

Can you provide the dmesg when error happens?

[ 886.107913] tegra_nvdisp_handle_pd_disable: Powergated Head2 pd
[ 886.108047] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 886.108901] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 886.118517] tegradc 15210000.nvdisplay: blank - powerdown
[ 982.640572] tegradc 15210000.nvdisplay: unblank
[ 982.643162] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 982.643298] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 982.643407] tegra_nvdisp_handle_pd_enable: Unpowergated Head2 pd
[ 982.649127] Parent Clock set for DC plld2
[ 982.653496] tegradc 15210000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 982.684657] tegradc 15210000.nvdisplay: unblank
[ 1606.048842] tegradc 15210000.nvdisplay: blank - powerdown
[ 1606.107678] extcon-disp-state external-connection:disp-state: cable 47 state 0 already set.
[ 1606.107680] Extcon AUX1(HDMI) disable
[ 1606.129744] tegra_nvdisp_handle_pd_disable: Powergated Head2 pd
[ 1606.129824] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 1606.130362] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 1606.143167] tegradc 15210000.nvdisplay: blank - powerdown
[ 1611.506493] tegradc 15210000.nvdisplay: unblank
[ 1611.507125] tegra_nvdisp_handle_pd_enable: Unpowergated Head0 pd
[ 1611.507223] tegra_nvdisp_handle_pd_enable: Unpowergated Head1 pd
[ 1611.507302] tegra_nvdisp_handle_pd_enable: Unpowergated Head2 pd
[ 1611.508660] Parent Clock set for DC plld2
[ 1611.518747] tegradc 15210000.nvdisplay: hdmi: tmds rate:148500K prod-setting:prod_c_hdmi_111m_223m
[ 1611.560818] tegradc 15210000.nvdisplay: unblank
[ 1611.629586] tegradc 15210000.nvdisplay: blank - powerdown
[ 1611.691348] extcon-disp-state external-connection:disp-state: cable 47 state 0 already set.
[ 1611.691350] Extcon AUX1(HDMI) disable
[ 1611.709731] tegra_nvdisp_handle_pd_disable: Powergated Head2 pd
[ 1611.709807] tegra_nvdisp_handle_pd_disable: Powergated Head1 pd
[ 1611.710262] tegra_nvdisp_handle_pd_disable: Powergated Head0 pd
[ 1611.713245] tegradc

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


Could you share the full log instead of a partial one?