[systemsettings] [Bug 436349] Monitor dropdown can not be enabled

[Roman Azami]

https://bugs.kde.org/show_bug.cgi?id=436349

--- Comment #6 from Roman Azami <nascentsoul13 at gmail.com> ---
(In reply to Roman Azami from comment #5)
> I tried fixing this as it is tagged as a junior job but couldn't, here are
> my findings though. 
> 
> It seems like the problem lies in a function XVidExtWrap::_ScreenCount(). It
> gets called from KGamma constructor and then the returned count value is
> used to configure screens combobox in a function KGamma::setupUI(). When
> configuring combobox, if screen count <=1 checkbox. From my observation
> XVidExtWrap::_ScreenCount() always returns 1 no matter if I plug\unplug my
> second monitor thus creating bug in question.
> 
> Looking at XVidExtWrap::_ScreenCount() implementation it uses class
> XF86ConfigPath to get count of screens. In XF86ConfigPath constructor there
> is defined a list of magic string paths that it tries to access all sorts of
> configs and fails at all of them (I also checked each path manually on my
> system and didn't find any of them). As it can't find any configs screen
> count is 0, but in the end of function it gets set to 1 after !count check. 
> 
> Sibling setting category "Display Configuration" somehow has "Device"
> combobox that correctly identifies current available screens. After looking
> into it's implementation for awhile I kinda gave up as this issue is too
> hard for me now.

Cant edit previous comment, little change:  "if screen count <=1 checkbox" to
"if screen count <=1 then combobox is disabled

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