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List: kde-panel-devel
Subject: Re: kscreen daemon race
From: Sebastian =?ISO-8859-1?Q?K=FCgler?= <sebas () kde ! org>
Date: 2016-06-01 0:09:10
Message-ID: 3882560.CHTihAnTLr () manta
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On Tuesday 31 May 2016 14:29:06 Sebastian Kügler wrote:
> Discussed with mgraesslin on IRC, preliminary conclusion below...
>
> On dinsdag 31 mei 2016 14:05:06 CEST Sebastian Kügler wrote:
> > https://bugs.kde.org/show_bug.cgi?id=358011 dual screen not setup after
> > reboot
> >
> > This bugreport seems to be a common problem, and it's a good example for
> > what's wrong with the screen configuration on startup.
> >
> > TL;DR: We have a race condition when the kscreen daemon starts. It looks
> > up
> > a known config, then applies it and subsequently resaves the config. The
> > same happens on config changes, it writes, then re-reads and then
> > re-writes
> > the config change.
> > I've managed to prevent this from happening by adding a timer that avoids
> > saving the config as a direct reaction to our own config changes.
>
> So what we want to try is the same mechanism that KWin uses. Kwin watches
> for configuration changes for 100ms, if any change takes longer than 100ms,
> it's considered unrelated. Basically, what we want to do in kscreen daemon
> is:
>
> - start a timer in kscreen daemon for 100ms after
> SetConfigOperation::finished and
> - restart it for every configChanged that arrives while the timer is still
> running,
> - if the timer has timed out in the meantime, react to configChanged as
> usual
>
> That should achieve the same effect as the "current" timer approach (which
> was just a proof of concept to prove my point, anyway.
>
> Let's see how this goes.
Patch: https://phabricator.kde.org/D1730
--
sebas
Sebastian Kügler • http://vizZzion.org • http://www.kde.org
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