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skip to content david edmundson's web log just another wordpress site menu and widgets search for: recent posts changes to ksmserver my month in kwin/wayland plasma startup cross-process runners plasma accessibility updates recent comments sudhir khanger on my month in kwin/wayland mr. s on my month in kwin/wayland ferdinand thommes on my month in kwin/wayland michael on plasma startup siddhartha on plasma startup archives november 2018 july 2018 april 2018 october 2017 september 2017 august 2017 september 2016 june 2016 march 2016 february 2016 october 2015 september 2015 august 2015 july 2015 june 2015 april 2015 march 2015 february 2015 january 2015 december 2014 november 2014 october 2014 september 2014 august 2014 december 2013 november 2013 october 2013 september 2013 august 2013 may 2013 april 2013 march 2013 february 2013 january 2013 december 2012 october 2012 september 2012 august 2012 july 2012 june 2012 may 2012 april 2012 march 2012 february 2012 january 2012 december 2011 november 2011 october 2011 august 2011 july 2011 may 2011 march 2011 february 2011 january 2011 december 2010 december 2009 september 2009 categories blog kde software meta log in entries rss comments rss wordpress.org changes to ksmserver reason for the blog i’m changing kde startup/shutdown a lot, whilst i aim to keep everything working exactly as before, please test this part thoroughly and report if you see any issues in the 5.15 cycle. what is ksmserver? in theory ksmserver is an x session manager. an x session manager is responsible for saving/restoring your session when you log out and in (and subsessions if you use activities) as well as prompting all your applications if it’s safe to log out. currently this is one of the most important processes of the plasma session. killing this process will immediately end the session. as it runs all session it’s a bit of a dumping ground for: – handling all autostart (including plasmashell etc) – running shutdown scripts – screensaver – some global shortcuts about session management – spawning the logout prompts – invoking the actual shutdown why change it? as ksmserver handles startup our wayland session depends on x (or rather xwayland), this is slower as we have to spawn it on startup, as well as being problematic for alternative devices where xwayland may not be a useful option. also if we come up with a new session manager protocol that works well with wayland, we will need to replace just the session manager part. equally we have attempts to replace startup with for example, systemd units (and yes, there’d be a fallback) where we still want a working session manager. in addition, some of the code isn’t in the best state. it dates back to the 90s, without really having an active maintainer. there’s been some significant changes to the way linux desktops work since that time. there’s a lot to be cleaned up. the plan the golden rule is to refactor not rewrite. there have been numerous attempts at redoing startup, all good tech demos, but none are usable for production as they don’t pay attention to matching with the current state and intricate startup hooks, something we need when we’re talking about enterprise deployment who will have customisations. the end goal is for ksmserver to be just an xsessionmanager. allowing wayland-compatiable competitors to come alongside or potentially replace it down the line. startup and shutdown will become multiple independent binaries (unix philosophy style) allowing them to be individually replaced all tied together with dbus activation. they will also be refactored to be considerably more readable. current state there’s been an internal refactor, which has been merged in master, the next step is to split into different processes once we’ve had feedback on the current work. posted on november 28, 2018 november 28, 2018 categories kde leave a comment on changes to ksmserver my month in kwin/wayland june has been a busy month in kwin, with me working on fixing remaining wayland functionality and upcoming legend vlad zagorodniy working on polishing and cleaning up all the effects. in this blog i’ll talk about the more interesting bits of kwin work that i did during june. fractional scaling a requested feature is to allow fractional scaling for qhd monitors which are roughly 1.5 times the resolution of standard monitors, but not the full 4k. the wayland scale system is based around integers, but because the scaling is based around a normalised co-ordinate system , the compositor can show a display at a scale of 1.5 whilst clients are rendering for a 2x display with no changes in the client. patchset consists of xdgoutput support in both kwin and qt so that windows that position themselves (such as xwayland clients, or plasmashell) can know the correct logical size of the screen and then relevant changes in kwin/kscreen to implement the extra fractional part. unfortunately as this requires a change in qt to function properly. this won’t be available in our ui until plasma depends on the qt version that contains this support, probably around march 2019. stupid desktop linux. cursor scaling on the topic of scaling, i merged support for making sure that the cursor is the physical size the user selected regardless of the resolution of the monitor it happens to be on or the scale of the client that supplied it. particularly useful for a multi-monitor setup where blindly using a pixel size doesn’t cut it. xdgwmbase the protocol for clients to register toplevels and popups to the window manager has gone through multiple stages, wl_shell, xdgshellv5, xdgshellv6 now settling on the finally stable protocol, xdg wm base. having this finally stable is a hugely signifiant point in the road to wayland. previously we were lagging behind other desktops in shell protocol support, but kwin 5.14 will have support for xdg wm base ahead of the toolkit support coming in qt 5.12 / next gtk. gtk decorations gtk gained server side decoration support in 3.22, however, the implementation needed some work. it correctly removed it’s own decorations under kwin but failed to inform kwin, which didn’t want to add a “second” titlebar, leaving it in an even worse state than before. i submitted a patch for gtk rectifiying all the issues and that was all merged pretty swiftly. misc kwin also gained support to show different mouse cursors for resizing the left edge of a window or the right edge of a window. useful for telling which window will be resized in the case of touching windows. posted on july 2, 2018 july 3, 2018 categories kde 3 comments on my month in kwin/wayland plasma startup startup is one of the rougher aspects of the plasma experience and therefore something we’ve put some time into fixing why is startup slow? the primary reason for plasma startup being slow is simply that it does a lot of things, including: session restore config migration setting keyboard layouts most esoterically, making sure your colour scheme gets synced to the xrdb database, so that loading xfig or dia or any other pre-qt/gtk1 application still has the correct colours in your plasma session too many to list. this means it’s easily a whole second or more before we even start loading plasmashell, one of the more time consuming parts of startup. this slow load gets exaggerated by us not removing the splash screen till everything is actually properly loaded. however, it’s still an area we can improve. about startup startup consists of mulitple components invoked at 3 different levels. kcminit config modules (kcms) typically update a system when the user applies the settings, however as we need to restore settings there is an optional hook called on startup for various modules. kde daemons (kded) evolving from the more static nature above may services require running in the background waiting for external events. some modules are loaded on demand, others are loaded explicitly during startup. autostarted applications meaning launcing core

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Domain name:
davidedmundson.co.uk

Data validation:
Nominet was able to match the registrant's name and address against a 3rd party data source on 09-Sep-2013

Registrar:
1 & 1 Internet SE [Tag = 1AND1]
URL: https://www.1and1.co.uk

Relevant dates:
Registered on: 17-Nov-2007
Expiry date: 17-Nov-2019
Last updated: 16-Nov-2017

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WHOIS lookup made at 01:39:28 14-Sep-2018

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  ARGS davidedmundson.co.uk

  PORT 43

  TYPE domain

DOMAIN

SPONSOR
1 & 1 Internet SE [Tag = 1AND1]
URL: https://www.1and1.co.uk
Relevant dates:

  CREATED 17-Nov-2007

  CHANGED 16-Nov-2017

STATUS
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  NS2.DREAMHOST.COM 208.97.182.10

  NS3.DREAMHOST.COM 66.33.205.230

  NAME davidedmundson.co.uk

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