Dear list, I am searching the cause of a little issue, which some day appeared.
The issue is the following: In KDE (and maybe other windowmanagers) the screen is going black after a while of doing nothing. This is especially annoying, when watching a video in firefox i.e. from youtube or watching a video in VLC. I tried several settings in VLC shutting down the screensaver, changesd settings of powerdevil in KDE and also changed settings of the swcreensaver in XFCE (which KDE relies on). As far as I understood, it might be related to DPMS and less to the screensaver. The strange thing is: When watching a video with "smplayer" or with "mpv", then the screen is not going blank. Additionally it is to mention, that only the screen is goiung blank (lights are out and content freezes). When watching a video and the screen goes dark, then audio is still going on, showing, the video is going on running. So IMO it is not a screensaver thing, more a energysaver-thing somehow. Maybe it is controlled by the kernel? The hints I got, are to disable screen blanking by using the "set screen" command, although this might be a workaround, It is not what I want. Blanking the screen after a while is ok for me, when doing nothing, but when I am watching video in VLC or in fiirefox, this should be switched off. Any ideas, from where this behaviour is controlled? Or some other ideas, like this could be fixed? My hardware is a notebook Lenovo T-520, running debian/stable, fully upgraded. Thanks for any help! Best Hans
