Bug 518670 – Qt5: mouse settings such as "reverse scroll direction" are ignored

• Status: RESOLVED INVALID
• Product: Gentoo Linux

[Description Simon 2014-07-31 12:31:09 UTC]

In KDE I reverse my scrolling through the setting: 
"System Settings"->"Hardware"->"Input Devices"->"Mouse"->"General"->"Reverse scroll direction"

If I build an application with Qt4 or the precompiled Qt5 packages from digia, Qt acts like the configured scroll direction, only the build with the Qt5 from the qt overlay do not work as expected.

[Comment 1 Davide Pesavento (RETIRED) 2014-08-04 12:42:26 UTC]

Where is this preference saved?

@kde, any ideas?

[Comment 2 Johannes Huber (RETIRED) 2014-08-04 15:38:43 UTC]

Why should a qt application should something know about kde configuration? And why this should be a distribution bug?

~/.kde4/share/config/kcminputrc:

[Mouse]
ReverseScrollPolarity=false

[Comment 3 Davide Pesavento (RETIRED) 2014-08-05 00:43:19 UTC]

(In reply to Johannes Huber from comment #2)
> Why should a qt application should something know about kde configuration?
> And why this should be a distribution bug?

I don't know, but the reporter claims that the setting is respected by the precompiled Qt5 binaries distributed by Digia.

> ~/.kde4/share/config/kcminputrc:

This path (or parts of it) doesn't appear anywhere in the qtbase repo.

[Comment 4 Johannes Huber (RETIRED) 2014-08-06 17:11:04 UTC]

(In reply to Davide Pesavento from comment #3)
> I don't know, but the reporter claims that the setting is respected by the
> precompiled Qt5 binaries distributed by Digia.
> 
> > ~/.kde4/share/config/kcminputrc:
> 
> This path (or parts of it) doesn't appear anywhere in the qtbase repo.

For plasma 5 the location is ~/.config/kcminputrc (same config key).

[Comment 5 Davide Pesavento (RETIRED) 2014-11-22 14:56:07 UTC]

Simon, is this still an issue with in-tree (masked) packages?

[Comment 6 Simon 2014-12-11 14:35:35 UTC]

Yes, its still not working (tested with 5.4.0_rc:5::qt)

[Comment 7 Davide Pesavento (RETIRED) 2014-12-11 18:14:05 UTC]

You can try running a simple app affected by this under strace, first with gentoo packages and then with digia binaries, and compare the two traces to see if we missed some config file. I suggest using `strace -e trace=file ...`

[Comment 8 Simon 2014-12-12 12:09:40 UTC]

Created attachment 391488 [details]
the two different strace files

ok I made a small test program and those are the outputs

[Comment 9 Simon 2014-12-12 12:10:34 UTC]

Created attachment 391490 [details]
the mini test program for scroll testing

and here is the small program to check if the setting is loaded correctly

[Comment 10 Davide Pesavento (RETIRED) 2014-12-12 15:47:17 UTC]

(In reply to Simon from comment #8)
> Created attachment 391488 [details]
> the two different strace files
> 

How am I supposed to open this? It looks like a .tar.gz...of what? Please attach the *two* *plain-text* files, and possibly a unified diff too.

[Comment 11 Simon 2014-12-12 16:38:12 UTC]

Created attachment 391506 [details]
strace of the miniscroll on gentoo

sorry i accidently packaged the binary instead of the strace file for one of the straces

[Comment 12 Simon 2014-12-12 16:38:34 UTC]

Created attachment 391508 [details]
strace of the miniscroll on digia qt

[Comment 13 Simon 2014-12-12 16:39:02 UTC]

Created attachment 391510 [details, diff]
diff miniscroll.gentoo-qt5.4.0_rc.strace miniscroll.qt5.4.0.strace

[Comment 14 Davide Pesavento (RETIRED) 2014-12-12 17:07:16 UTC]

/home/twist/.kde4/share/config/kdeglobals looks interesting but it's opened successfully by gentoo-qt too.

One difference I can see (but I'm not sure if it's related) is that your gentoo-qt installation doesn't have the ibus platforminputcontext plugin (USE=ibus in qtgui), so try to enable that...

[Comment 15 Simon 2014-12-15 09:30:27 UTC]

Ok, if I set the useflag ibus its working.

Perhaps the explenation of ibus for qtgui should be adjusted to be more informative about this.