25% shorter runtime on battery + the shitty NVIDIA GPU gets very hot so that I wouldn’t be able to keep the laptop on top of my lap…. Removing the option to turn on/off composition isnt good idea at all. if one window turns off compositing it will of course affect all screens. My biggest concern towards GNOME Shell has been from the beginning that it requires OpenGL (I talked about that part with Owen Taylor at GCDS). People with lousy hardware will choose “Disable desktop effects” and the others will like “Smart usage of desktop effects”. For them it’s just “KDE/Linux is slow”. I don’t think that watching Full-HD videos is a corner case any more. This is an open discussion, and I think people should be allowed to disable and enable compositing whenever they feel like it, tough this can be perfectly made, just adding an additional rule to powerdevil profile that makes a call to that api function (The default should be not disable, but powerdevil can give the option). Now concerning e.g. What are the ways to manage open windows in Plasma? April 19, 2018. While Plasma completely supports being without compositing, the world looks different with the two new Desktop Shells to be released this month. Windows has an API call for it, so all it needs is to implement that in wine and all games using the API call on windows will be ready. Dude, you are a fucking idiot. First of all we would need to know if turning compositing off helps. The applications will take care of providing the right user experience to the users. On the other hand a web browser would not block compositing as that is not what the user wants. With the application you want to adjust in focus, press Alt+F3 to open the options window. We don’t have many of those in Linux – KPat is not a problem. “Please turn compositing down (implementation is vague here, but I guess you could swap to XRender, or turn off heavy postprocessing such as blur and the like). How is that possible, you might ask? While using Gnome (2.32), the performance is fine and KDE applications like kontact, can be used normally. There’s a difference between games and games. The OpenGL context is removed, the effect system turned down and you have the plain old X desktop. As soon as you would switch to fullscreen, VLC would set an X property to tell KWin “now please don’t composite”. Press J to jump to the feed. When compositing is needed, it is on, when compositing is bad at the moment, it is off. (Turn off the compositor, select a rather expensive Gtk+ style like orta and drag a window across such gtk+ window to _see_ what i mean) and you’ll pay the server roundtrip anyway (and on /every/ pixel row/column), Of course fancy things like transparency, shadows, *blurring* etc. KDE Applications 18.04.0 are now released. Currently KWin supports unredirecting of fullscreen windows. Slide-back and cube animation (not cube) are the only ones where it may make sense to consider turning it off. i dont want to wait 2 or 3 years for it to happen when i need it to do it today. To view the existing shortcuts for Plasma, look in the “Global Shortcuts” window for “Component”. This way everyone is happy, even if drivers are the best in the world and the software workd good everywhere, there will be people that will prefer a few less fps for being able to press alt tab to the desktop from a game and have a compositing desktop to chat with game companions for example. http://en.wikipedia.org/wiki/Alprazolam I've just installed Ubuntu 19.10 with KDE Plasma and the Sweet theme. except the removal of the “Enable desktop effects” check box in the GUI. The users won’t have to care about the state anymore and an ugly hack like unredirection of fullscreen windows can be removed. I may be missing something, but why are having compositing on and playing an HD video incompatible? It also requires an OpenGL compositor (in that case Compiz). 2-making window based disable compisiting for apps that don’t support this api Those trying to learn how to move more efficiently through the Plasma desktop, check Global shortcuts, as this area houses all the different keyboard combos related to that. When composite is on, I have at least 60 wakeups/second coming from the driver (measured with powertop) on idle and an increased estimate of power consumption. Without compositing it is snappy. What happens when an application requests to turn off compositing and then crashes? queries. From the favorites tab in klauncher, open "Configure Desktop", select "Desktop Effects", then uncheck the checkbox that is called "Enable desktop effects at startup". What, however, does affect performance on my system is GPU-accelerated HD video decoding along with compositing. Flash finally got support for hardware-accelerated video on Linux and HD HTML5 video is becoming more and more popular. I think that category is designed by packagers and game developers, so disabling compositing here might be enough. To the naysayers: kwin will have the API to disable compositing, so you’ll always be able to do it. Concerning patching when new technology is around: that is the normal way to do such things. 1. no, not at all. 1-mergin disabling and suspending into suspendig Sometimes (luckily not often) it happens that compositing becomes so slow that it disables itself and then I am happy to enable it again in the systemsettings (I forget the keyboard shortcut, so I go to systemsettings to reenable compositing) after which compositing runs fluently again. You say it like it’s not a problem, If this happens then the api should not be published, everything should be working and polished for when you trow it at NETWM. Hoping for non kde apps to implement this is wishfull thinking, and i can name way more than 5 games from the top of my head that run under linux. So we give for the unexperienced users the overall best choice but keep the ability to control every aspect for the advanced users. There are use cases for using compositing and there are usecases for not using compositing. If KDE is run remotely via an XDMCP session it performance is bad, really really bad. This is pretty awesome. so you will have to patch every game out there to support the new standard? That’s a difference of >5W. KDE Ships KDE Applications 18.04.0. The average video also plays just fine and I rather have smoothly fading playback controls, OSDs, etc. Therefore we need a bettter system. 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well I think we can patch the five games that actually run on Linux without Wine. With unredirection compositing would be started again, causing an ugly flickering and taking away important resources from VLC. (PowerVR should currently be the king of the hill, but they do afaik only power ARM devices) , Oh, and Martin is perfectly right about plasma. Many KDE applications allow you to configure keyboard shortcuts. b) you can (at least for most mobile chips) enforce a specific performance mode (look out for the powermizer stuff), 3. multiscreen support in kwin is stepchilded anyway. I think years, so manually disabling should definitely don’t die, maybe it’s use could be minimized with that wine patch and making compositing off default for (fullscreen) games in kickoff. Go to the "Appearance & Fixes" tab Click with your right mouse button on a window decoration or use System Settings to access the new and easier configuration of KWin. Thanks. I can’t see how these two options can do anything bad. First of all he removed the difference between disabled effects and suspended effects. This mode can be entered at all time by the Shortcut Alt+Shift+F12 and in the General Desktop Effects settings through option “Enable desktop effects at startup”. So this is really a corner case for which manual switching is enough and I don’t want compositing disabled for any other case automatically whenever some random application decides it’s OK. When compositing is turned off, Plasma starts to change the backgrounds of all SVGs causing in the worst case a re-rendering of all of them. I think you said what you said because intuitively you believe anything done in the gpu uses a lot of power. Concerning a more fine grained approach is probably not a good idea as I doubt that most devs know the exact difference between unredirected and (in case of KWin) suspended compositing. In the Configure Shortcuts window, you will see a list of all the shortcuts available in the current application. Most of the time i got a fullscreen video on one monitor and everything else on the other. If I follow you correctly, you can press Shift-Alt-F12 to turn Kwin compositing back on. Well since you are an “expert” in power management, kwin internals and plasma internals I’d like you to share with the rest of us your technical reasons disproving I personally doubt that turning compositing off will save battery, but will cause a further drain. That depends on how Firefox implements it, but in general I would say that Firefox should never set the property. The KDE Plasma Workspaces ™ provide keyboard shortcuts that allow you to perform many tasks without touching your mouse. In order to be able to type Umlauts I have to press the compose key+shift+'+vowel. After selecting Plasma, you’ll see a complete list of shortcuts on the side. As explained here, you can open a new session (=tab) by sending a qdbus command. However, you can set compositing for specific applications. Press question mark to learn the rest of the keyboard shortcuts. Note: Global Shortcuts also has shortcut information for other core aspects of KDE, like the KWin window manager, KDE Power manag… First, if buggy drivers slow down desktop when compositing is enabled and the user will want to disable it, he couldnt do that easily, and he will have a laggy desktop environment. Let’s say we want to watch a video in VLC. It is already added to the window rules framework. From the same screen, you can define a shortcut to enable/disable compositing anytime. Currently the fallback is also GNOME Panel, in future maybe Unity2D? This should make everything more clear to the user. I thought the decision on the mailing list was to keep the option but also allow people to turn off desktop effects while keeping compositing. I really don’t know about the use cases of the average KWin user but in my case compositing does not greatly affect the performance of QuakeLive (Linux version). But maybe I am just stating my idiocy again . KDE Applications 19.04.1 Full Log Page - KDE.org That’s >25% shorter runtime on battery + the shitty NVIDIA GPU gets very hot so that I wouldn’t be able to keep the laptop on top of my lap…. Removing the option to turn on/off composition isnt good idea at all. if one window turns off compositing it will of course affect all screens. My biggest concern towards GNOME Shell has been from the beginning that it requires OpenGL (I talked about that part with Owen Taylor at GCDS). People with lousy hardware will choose “Disable desktop effects” and the others will like “Smart usage of desktop effects”. For them it’s just “KDE/Linux is slow”. I don’t think that watching Full-HD videos is a corner case any more. This is an open discussion, and I think people should be allowed to disable and enable compositing whenever they feel like it, tough this can be perfectly made, just adding an additional rule to powerdevil profile that makes a call to that api function (The default should be not disable, but powerdevil can give the option). Now concerning e.g. What are the ways to manage open windows in Plasma? April 19, 2018. While Plasma completely supports being without compositing, the world looks different with the two new Desktop Shells to be released this month. Windows has an API call for it, so all it needs is to implement that in wine and all games using the API call on windows will be ready. Dude, you are a fucking idiot. First of all we would need to know if turning compositing off helps. The applications will take care of providing the right user experience to the users. On the other hand a web browser would not block compositing as that is not what the user wants. With the application you want to adjust in focus, press Alt+F3 to open the options window. We don’t have many of those in Linux – KPat is not a problem. “Please turn compositing down (implementation is vague here, but I guess you could swap to XRender, or turn off heavy postprocessing such as blur and the like). How is that possible, you might ask? While using Gnome (2.32), the performance is fine and KDE applications like kontact, can be used normally. There’s a difference between games and games. The OpenGL context is removed, the effect system turned down and you have the plain old X desktop. As soon as you would switch to fullscreen, VLC would set an X property to tell KWin “now please don’t composite”. Press J to jump to the feed. When compositing is needed, it is on, when compositing is bad at the moment, it is off. (Turn off the compositor, select a rather expensive Gtk+ style like orta and drag a window across such gtk+ window to _see_ what i mean) and you’ll pay the server roundtrip anyway (and on /every/ pixel row/column), Of course fancy things like transparency, shadows, *blurring* etc. KDE Applications 18.04.0 are now released. Currently KWin supports unredirecting of fullscreen windows. Slide-back and cube animation (not cube) are the only ones where it may make sense to consider turning it off. i dont want to wait 2 or 3 years for it to happen when i need it to do it today. To view the existing shortcuts for Plasma, look in the “Global Shortcuts” window for “Component”. This way everyone is happy, even if drivers are the best in the world and the software workd good everywhere, there will be people that will prefer a few less fps for being able to press alt tab to the desktop from a game and have a compositing desktop to chat with game companions for example. http://en.wikipedia.org/wiki/Alprazolam I've just installed Ubuntu 19.10 with KDE Plasma and the Sweet theme. except the removal of the “Enable desktop effects” check box in the GUI. The users won’t have to care about the state anymore and an ugly hack like unredirection of fullscreen windows can be removed. I may be missing something, but why are having compositing on and playing an HD video incompatible? It also requires an OpenGL compositor (in that case Compiz). 2-making window based disable compisiting for apps that don’t support this api Those trying to learn how to move more efficiently through the Plasma desktop, check Global shortcuts, as this area houses all the different keyboard combos related to that. When composite is on, I have at least 60 wakeups/second coming from the driver (measured with powertop) on idle and an increased estimate of power consumption. Without compositing it is snappy. What happens when an application requests to turn off compositing and then crashes? queries. From the favorites tab in klauncher, open "Configure Desktop", select "Desktop Effects", then uncheck the checkbox that is called "Enable desktop effects at startup". What, however, does affect performance on my system is GPU-accelerated HD video decoding along with compositing. Flash finally got support for hardware-accelerated video on Linux and HD HTML5 video is becoming more and more popular. I think that category is designed by packagers and game developers, so disabling compositing here might be enough. To the naysayers: kwin will have the API to disable compositing, so you’ll always be able to do it. Concerning patching when new technology is around: that is the normal way to do such things. 1. no, not at all. 1-mergin disabling and suspending into suspendig Sometimes (luckily not often) it happens that compositing becomes so slow that it disables itself and then I am happy to enable it again in the systemsettings (I forget the keyboard shortcut, so I go to systemsettings to reenable compositing) after which compositing runs fluently again. You say it like it’s not a problem, If this happens then the api should not be published, everything should be working and polished for when you trow it at NETWM. Hoping for non kde apps to implement this is wishfull thinking, and i can name way more than 5 games from the top of my head that run under linux. So we give for the unexperienced users the overall best choice but keep the ability to control every aspect for the advanced users. There are use cases for using compositing and there are usecases for not using compositing. If KDE is run remotely via an XDMCP session it performance is bad, really really bad. This is pretty awesome. so you will have to patch every game out there to support the new standard? That’s a difference of >5W. KDE Ships KDE Applications 18.04.0. The average video also plays just fine and I rather have smoothly fading playback controls, OSDs, etc. Therefore we need a bettter system.

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