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List:       kwin
Subject:    Re: Using UnredirectFullscreen=false by default in distributions
From:       alekcejk () googlemail ! com
Date:       2010-06-03 12:52:58
Message-ID: hu88jm$n1r$1 () dough ! gmane ! org
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So, KWin developers do not recommend distros to change default value of 
UnredirectFullscreen?

Thomas Lübking wrote:

> IMO this is far more usecase than distro related.
> 
> If you're on an office box and tend to use fullscreen text processing,
> then the unredirection sucks because of all the tooltips and popups.
> 
> If you're on a home or mixed mode client (and maybe think that using
> maximized/fullscreen applications is plain wrong anyway ;-) then
> unredirection will usually take place on video playback and/or gaming.
> 
> As the cpu overhead for the redirected painting heavily scales with the
> update frequency and those usecases are cpu/gpu intense anyway, you really
> want a) the unredirection to take place, or
> b) suspend compositing while playing movies/gaming (for even more
> performance)
> 
> (a third case are screensavers, but fancy screensavers are "nonsense"
> anyway and also the re-redirection causes flicker and therefore a
> bugreport as you can glimpse the desktop/root window when promted the
> password dialog.)
> 
> So: personally i'd keep unredirection as
> a) i think maximizing windows is plain wrong ;-)
> b) i don't have to actively suspend/resume compositing when playing some
> HD movie.
> 
> The solution is however to prevent the flicker.
> => HACKISH (?) FIX:
> I think storing the root (pixmap), dumping the fullscreen window into the
> root, re-redirecting and restoring the original root (pixmap) would do the
> job - never tested though and this also might be HW/driver related (Does
> everybody else see the root pixmap on re-redirection?!)
> 
> Thomas
> 
> Am Tuesday 01 June 2010 schrieb alekcejk@googlemail.com:
>> Hi,
>> 
>> I have read solution from
>> https://bugs.kde.org/show_bug.cgi?id=177495#c2
>> that fixes windows flickering in fullscreen mode.
>> 
>> Kubuntu uses UnredirectFullscreen=false in default KWin settings
>> https://bugs.launchpad.net/ubuntu/+source/kubuntu-default-
settings/+bug/327
>> 199
>> 
>> Is this solution good enough for all distributions?
>> Is there many issues related with performance hit when
>> UnredirectFullscreen=false used?
>> 
>> Alexey Kurov <nucleo@fedoraproject.org>
>> _______________________________________________
>> kwin mailing list
>> kwin@kde.org
>> https://mail.kde.org/mailman/listinfo/kwin


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