[fralik]

Hi!

I have an Intel NUC with several video outputs (1 HDMI, 2xDisplayPorts). My connections are HDMI -> TV, DP -> Amplifier. So I use HDMI video output solely for video, and DisplayPort solely for audio (no passthrough or anything on DisplayPort).

I then tried to set display to sleep after 5 minutes. The problem is that display goes to sleep, but takes audio output with it. I understand that I lose audio because it comes from a DP, but what I am interested in: is it possible to send only one interface to sleep. Ideally, only the video output that is selected for KODI output should be affected by DPMS.

I run Kodi 14.2 Git 7cc53a9
Kernel 3.13
Ubuntu 14.04
My Debug log: http://goo.gl/z96ed8

[fritsch]

In short:

- Upgrade kernel to >= 4.0.x
- Upgrade linux-firmware
- Use drm_kms_helper to overwrite the EDID information and pray :-) or teach your TV / AMP to transmit the EDID info when off. Alternatively you can check to "close" Pin 19, which is the hotplug detect.

[fralik]

Thanks fritsch!

I am now on kernel 4.0.4, also update linux-firmware and my release is now 14.04.2.

Maybe you could provide a bit more information about drm_kms_helper? I'v tried taping pin 19 - no luck. My /sys/module/drm_kms_helper/parameters/edid_firmware is empty.

This really puzzles me, because in my mind the outputs should be independent..

I also looked in the source code. Seems that power management acts upon Display class (Display* dpy = g_Windowing.GetDisplay();, from DPMSSupport.cpp), but I am not sure if this display consist of several screens, or there is a separate display per video output.

[fritsch]

That you don't get Audio anymore has nothing to do with kodi. When TV turns off, the Audio device unregisters :-(

See the arch wiki for drm_kms_helper. You will need to combine that with grub overwrite and xorg.conf (but only if you want to boot without TV powered on): https://wiki.archlinux.org/index.php/Ker...de_setting

Especially: https://wiki.archlinux.org/index.php/Ker...s_and_EDID

[fralik]

Thanks again! Will read through the page.

Seems to be harder than I expected Probably will stick with my old method: suspending TV from a remote control. By doing this audio is still present, and there are no glitches in audio playback.