On 08/04/2018 03:00 AM, Felix Miata wrote:
> This is on Kubuntu 18.04. Everything on the Monitor & Display Power Management
> tab is grayed out, so power save is stuck at 10 minutes. What package(s) would
> be missing to cause this?
> 

Felix,

  That is controlled by 'kcmshell display' module (it is/was tdecmshell on
TDE). You can verify that it is found (it should be if it is all blank) with
'tdecmshell --list'. The primary source for the tdecmshell display page is:

    /tde/main/tdebase/kcontrol/display/display.cpp

Apparently the following code is failing (old version probably similar to current:

  TDECModule *kcm = TDECModuleLoader::loadModule( name, page );

  if ( kcm )
  {
    top->addWidget( kcm );
    m_tabs->addTab( page, label );

    connect( kcm, TQT_SIGNAL( changed(bool) ), TQT_SLOT( moduleChanged(bool) ) );
    m_modules.insert(kcm, false);
  }
  else
    delete page;

(so it appears 'delete page' is being called in your case)

  The actual sliders and widgets that would be created if the module was found
would be in:

    /tde/main/tdebase/kcontrol/displayconfig/displayconfig.cpp

  The tdelibs source isn't any more helpful on exactly which module the
'display' relies on, see

    /tde/main/tdelibs/tdecmshell/main.cpp
and
    /tde/main/tdelibs/tdeui/tdecmodule.cpp

  Sorry not much more help than being able to tell you where to look in the
source. The only thing I can think of would be that something wasn't set
properly when the display.moc was generated -- but you would expect that would
be confirmable by everybody. Do you get any debug messages/warnings?

(I think it is kdWarning(780) if the module can't be found)

-- 
David C. Rankin, J.D.,P.E.