[mythtv-users] Control HDMI output to switch TV on/off

Bruce Taber b.taber at comcast.net
Tue Nov 8 14:49:35 UTC 2011

On 11/08/2011 09:38 AM, Roger H wrote:
> On Tue, Nov 8, 2011 at 9:23 AM, David Watkins <watkinshome at gmail.com
> <mailto:watkinshome at gmail.com>> wrote:
>     > Question is, what constitutes being on or off on an Nvidia HDMI
>     connector
>     > on a Zotac board. Setting blank doesn't do it as the TV seems to
>     be seeing
>     > a signal that says black screen. Is there a way of "turning off"
>     the HDMI
>     > connection so the TV turns off?
>     Well there must be a way, because it's working for me.
>     I'm using a Nvidia based Zotac ION frontend, connected over HDMI to an
>     LG television.
>     If I leave MythTV on a menu then, after a while the screen goes blank.
>      A short while later the TV screen save kicks in and a short while
>     after that the TV turns off.
>     The bad news is that I can't think of anything special that I did to
>     make this happen.  (I use gdm to autologin the mythtv user with a
>     ratpoison window manager, and start the frontend).  I haven't changed
>     any screensaver settings from their defaults, as far as I know (which
>     I think means that mythtv is controlling the screensaver using DPMS)
> The original poster is using a Sony Bravia TV and you are using an LG
> television so maybe the difference is the Sony won't respond DPMS over
> HDMI.  Just a thought.
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I think it is just a normal mode of operation. My Panasonic TV has the
same behavior. It is hooked to an Nvidia 8400 through HDMI. The mythtv
menus provide no change? in signal so the TV first blanks and then
powers itself off.

I often use mplayer in a terminal to pull radio from a separate system
or an Internet feed. I have to use either mythgallery or live tv to keep
the TV from shutting off and consequently turning off the speakers. The
good news is that once the audio is coming from mplayer, mythtv's audio
is muted.

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