Questions[plasma-5](ubuntu)

I'm using KDE Plasma 5 right now, and I noticed that the keyboard shortcut Meta + Tab is used to switch between Activities, and Alt + Tab is obviously used to switch between windows. I would like to know if there's a similar way to switch between virtual desktops, and if so, how I can set Meta + Tab to toggle it. I only have two virtual desktops, each with a bunch of specifically positioned windows in them. I'd like something more efficient than clicking on the Pager widget every time I want to quickly switch. I'm a bit new at this, so I apologize if I'm obviously doing something wrong. Thanks, community!

• Kubuntu 20.04, 64 bit
• GPU: Geforce GT610
• nvidia-driver-390
• Chrome Version 85.0.4183.83
• Intel i5-4430, core 4, 4 thread , 3GHz
• RAM: 16GB

Each time I go into suspend mode and then resume, Chrome browser displays the current tab as full of sand of colors, something like dithering in image processing.

Other tabs display glitches too.

The current solution is to close and reopen the browser.

I tested nvidia-driver-418 but got a black screen problem and reinstalled nvidia-driver-390.

The problem is more evident in Chrome, but it sometimes appears in vscode in small areas. There, hovering the mouse over the affected place or resizing the window fixes the problem. In Kubuntu the avatar of the user in the application launcher also shows dithered.

I tested in the same machine with fedora 32 workstation(gnome), nvidia driver, and had the same problems with Chrome browser.

Could it be a GPU problem?

I'm using Kubuntu 18.10 and have the default file manager, Dolphin, set up quite nicely with servers, favorites etc. in the sidebar.

Now, whenever I want to open a file or folder from within a program, this file picker opens:

Now, many programs open this file/folder picker instead of the Dolphin file picker:

EDIT: This happens for example in Sublime Text and Firefox. Preinstalled programs (e. g. Spectacle or Kate) seem to actually do display a Dolphin file picker!

Is there any way to replace this with the Dolphin file picker, or at least get my favorites etc. into whatever this program is?

The KDE lock screen has media player controls that look like this:

I would like to turn this feature off, as described in D9685 (Add config for the lockscreen to toggle media controls) and KDE Bug 384264.

I am running KUbuntu 18.04 with KDE Plasma 5.12.7, and my lock screen config file looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<kcfg xmlns="http://www.kde.org/standards/kcfg/1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.kde.org/standards/kcfg/1.0
      http://www.kde.org/standards/kcfg/1.0/kcfg.xsd" >
  <kcfgfile name=""/>

  <group name="General">
    <entry name="showMediaControls" type="Bool">
      <label>If true, shows any currently playing media along with controls to pause it.</label>
      <default>true</default>
    </entry>
  </group>

</kcfg>

/usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/lockscreen/config.xml

Unlike older versions, the media controls are configurable in Plasma 5.12.7:

$ grep -B 3 -A 2 config.showMediaControls /usr/share/plasma/look-and-feel/org.kde.breeze.desktop/contents/lockscreen/LockScreenUi.qml
Loader {
    Layout.fillWidth: true
    Layout.preferredHeight: item ? item.implicitHeight : 0
    active: config.showMediaControls
    source: "MediaControls.qml"
}

Accordingly, I have tried to change the showMediaControls setting, but the setting is not available in the screenlocker menu:

$ kcmshell5 screenlocker

Changing the theme from KUbuntu to Breeze or Breeze Dark had no effect.

I also tried changing the configuration from the command line. Since the name attribute of the kcfgfile element is empty, I would expect the config file to be lockscreenrc, so I used this command:

kwriteconfig5 --file lockscreenrc --group 'General' --key 'showMediaControls' --type 'bool' 'false'

However, this had no effect. Even after writing this setting to all these files:

• breezerc
• kcmshell5rc
• kdeglobals
• lockscreenrc
• plasmarc

the player controls are still visible on the lock screen. How can I actually remove the controls from the lock screen?

The following additional packages will be installed:
  cheese-common gnome-desktop3-data gnome-video-effects gstreamer1.0-clutter-3.0 libcheese-gtk25 libcheese8 libclutter-1.0-0 libclutter-1.0-common
  libclutter-gst-3.0-0 libclutter-gtk-1.0-0 libcogl-common libcogl-pango20 libcogl-path20 libcogl20 libgnome-desktop-3-17
  libjavascriptcoregtk-4.0-18 libwebkit2gtk-4.0-37 libyelp0 yelp yelp-xsl

Cheese comes with an acceptable amount of " gnomish" dependencies but before installing it I am looking for a more Qt-pure alternative.

Kamera comes by default but it doesn't even see the laptop camera, asks me to select one in a full alphabetical list, Komoso is absent, Kamerka is very basic (no video). I know how to use VLC for this but what other options are there?

By "alternative to Cheese" I basically mean one that would quickly allow image and video capture.