Upgrade/Install KDE Plasma 5.3 in Kubuntu 15.04/Ubuntu 15.04

Enhanced Power Management

• Power management settings can be configured differently for certain activities
• Laptop will not suspend when closing the lid while an external monitor is connected ('cinema mode', by default, can be turned off)
• Power management inhibitions block lock screen too
• Screen brightness changes are now animated on most hardware
• No longer suspends when closing the lid while shutting down
• Support for keyboard button brightness controls on lock screen
• KInfoCenter provides statistics about energy consumption
• Battery monitor now shows which applications are currently holding a power management inhibition for example ('Chrome is currently suppressing PM: Playing video')

Better Bluetooth Capabilities

• New Bluetooth applet
• Bluedevil was ported to a new library from KDE, BluezQt
• Added support for blocking and unblocking Bluetooth
• Connected devices with Browse Files (ObexFTP) support are now displayed in the file dialog's Places panel

Improved Plasma Widgets

• Clipboard applet gains support for showing barcodes
• The Desktop and Folder View containment codebases were unified, and have seen performance improvements
• The Recent Documents and Recent Applications sections in Application Menu (Kicker) are now powered by KDE activities
• Comics widget returns
• System monitor plasmoids return, such as CPU Load Monitor and Hard Disk usage

Big Steps Towards Wayland Support

• Plasma 5.3 makes a huge step towards to supporting the Wayland windowing system in addition to the default X11 windowing system. Plasma's window manager and compositor KWin is now able to start a nested XWayland server, which acts as a bridge between the old (X11) and the new (Wayland) world. X11 windows can connect to this server as if it were a normal X server, for KWin it looks like a Wayland window, though. This means that KWin learned to handle Wayland windows in this release, though full integration is only expected for Plasma 5.4.
• In addition KWin gained new output modes for Wayland allowing to start a nested KWin on X11 and to start KWin directly on a framebuffer device, which will be the fallback for the case that OpenGL and/or kernel mode settings are not supported. A rendering backend on kernel mode settings is expected for Plasma 5.4. More information about these new backends and how to test them can be found in the KWin wiki pages. Please keep in mind that this is only a development preview and highly experimental new code.