Bug#467105: ATI driver: use of Xv causes one monitor to be repeatedly blanked

[Alex Deucher]

On Tue, Feb 26, 2008 at 12:07 PM, Darren Salt
<linux at youmustbejoking.demon.co.uk> wrote:
> retitle 467105 ATI driver: "xset dpms force on" causes one monitor to be blanked briefly
>  thanks
>
>  I demand that Alex Deucher may or may not have written...
>
>
>  > On Sun, Feb 24, 2008 at 11:21 AM, Darren Salt
>  > <linux at youmustbejoking.demon.co.uk> wrote:
>  >> I demand that Brice Goglin may or may not have written...
>  >>> Darren Salt wrote:
>  >>>> One of my monitors (VGA-0) is repeatedly and regularly blanked and
>  >>>> unblanked, each change being approx. 1s apart when Xv is in use, e.g. by
>  >>>> gxine.
>  >> Actually, more like 1s off, 3s on, and for each pair of state changes,
>  >> there is a corresponding pair of
>  >>   enable montype: 1
>  >>   enable montype: 3
>  >> in the log.
>
>  > Why is gxine calling the DPMS hooks for the monitors?
>
>  It's designed to allow blanking when nothing is being played or the stream is
>  paused; on starting or resuming playback, it is intended that gxine will
>  unblank the display automatically. (There's no guarantee that the method used
>  to resume or start playback will also cause X to automatically unblank the
>  display; equally, there's no guarantee that the screen blanker will have cut
>  in, and gxine has no knowledge of whether it has.)
>
>  Also, I don't want it to ever be able to fail to restore the DPMS settings –
>  by not altering them, there's nothing to restore. This does require ensuring
>  that the blank timer never reaches 0 (unless it's set ludicrously low).
>

But why does it do it repeatedly? that's what causes the blinking.  it
should do it once, or am I missing something?

>
>  > Do other video players have the same problem?
>
>  Any which use the same methods will, since "xset dpms force on" is sufficient
>  to trigger the problem.

when you run "xset dpms force on" does the blinking continue after you
run it or does it happen once?

Alex