Ubuntu
xserver-xorg-video-intel package

  1. Bug #147073
  2. Comment #6

Comment 6 for bug 147073

Revision history for this message
Jamie Lokier (jamie-shareable) wrote : Re: xrandr causes temporary blanking of external output (tv out)

I can confirm unggnu's observation:

If I have TMDS-1 output to an external monitor, and LVDS disabled, then there's no blanking while Totem (et al) start.

If I have TMDS-1 and LVDS both enabled, there's a long blank while Totem starts.

So this isn't just VGA, it also affects DVI (i.e. TMDS-1) output, with VGA always disabled.

Also, how is the presence/absence of TV output relevant when Totem starts anyway?

I sometimes do this with a TV attached, and all that happens is I get a window as normal, or I can run it full screen on the TV head. It doesn't seen to _do_ anything with the knowledge that there's a TV connected. It behaves exactly the same as any other external display.

So is it just that Totem enumerates the multi-head display properties, the same as running xrandr, and this always causes a full re-detection even though it's not really necessary when no properties are being changed?

I think it would be quite reasonable if starting Totem could just read the info reported by xrandr last time it did a detection. (Similarly, xrandr could do with an option --report-last-values). If you really want to detect or act on changes to what's plugged in, you'll run xrandr or an equivalent tool explicitly anyway.