[Buildroot] [Bug 14206] New: QT5 touch screen rotation does not work since 2021.05

[Buildroot] [Bug 14206] New: QT5 touch screen rotation does not work since 2021.05

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

            Bug ID: 14206
           Summary: QT5 touch screen rotation does not work since 2021.05
           Product: buildroot
           Version: 2021.05
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned@buildroot.uclibc.org
          Reporter: t.ruschival@gmail.com
                CC: buildroot@uclibc.org
  Target Milestone: ---

The `rotate` parameter for the touchscreen orientation does not work using
environment variable QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS in QT5. e.g.
QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/touch:rotate=90 has no effect.
No value for rotation (90,180,270) has any effect.

It used to work up until 2021.02 and stopped working since Buildroot 2021.05.

Looking for the cause I found that since 2021.05 libxkbcommon
(BR2_PACKAGE_LIBXKBCOMMON) and libinput (BR2_PACKAGE_LIBINPUT) are selected. In
turn libevdev (BR2_PACKAGE_LIBEVDEV) is selected.
Libinput and libxkbcommon are selected by
BR2_PACKAGE_KODI_PLATFORM_SUPPORTS_GBM.

As a quick check I removed the line 'source "package/kodi/Config.in"' form
package/Config.in and rebuilt all in this case the touch-input rotation works.

Kodi was never selected on the system.  Would it make sense to only select
libinput and libxkbcommon if BR2_PACKAGE_KODI is actually selected?

I guess this affects all applications using QT5 with a rotated touch screen -
can anyone confirm this issue?

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[Buildroot] [Bug 14206] QT5 touch screen rotation does not work since 2021.05

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

--- Comment #1 from Thomas Ruschival <t.ruschival@gmail.com> ---
I succeeded narrowing down the issue by commenting out
"package/kodi/Config.in"' in package/Config.in and manually adding libraries.

Adding only libevdev does not affect the behavior of QT. Adding libinput as
well the touch screen rotation does no longer work.

Apparently /usr/lib/qt/plugins/platforms/libqeglfs.so is dynamically linked
against libinput if it is available during build time of Qt5.

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[Buildroot] [Bug 14206] QT5 touch screen rotation does not work since 2021.05

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

Thomas Ruschival <t.ruschival@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Thomas Ruschival <t.ruschival@gmail.com> ---
It is not a bug but a behavior of Qt5 v5.15.
(https://doc.qt.io/qt-5/inputs-linux-device.html) 

The issue can be solved/worked around in two different ways:

Either: 
Disable the use of libinput (QT_QPA_EGLFS_NO_LIBINPUT=1) and continue using the
environment variable
QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/touch:rotate=90

OR: 
use the generic platform plugin configuration variable
QT_QPA_GENERIC_PLUGINS=evdevtouch:/dev/input/touch:rotate=90

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[Buildroot] [Bug 14206] QT5 touch screen rotation does not work since 2021.05

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |---
                 CC|                            |yann.morin.1998@free.fr
           Assignee|unassigned@buildroot.uclibc |yann.morin.1998@free.fr
                   |.org                        |

--- Comment #3 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Thomas, All,

(In reply to Thomas Ruschival from comment #0)
> Looking for the cause I found that since 2021.05 libxkbcommon (BR2_PACKAGE_LIBXKBCOMMON)
> and libinput (BR2_PACKAGE_LIBINPUT) are selected. In turn libevdev (BR2_PACKAGE_LIBEVDEV)
> is selected.
> Libinput and libxkbcommon are selected by BR2_PACKAGE_KODI_PLATFORM_SUPPORTS_GBM.

Indeed, this code is incorrect; good catch! :-)

I'll send a patch soonish to fix that.

Regards,
Yann E. MORIN.

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[Buildroot] [Bug 14206] Kodi: even when not enabled, forcefully selects libevdev and libinput [was: QT5 touch screen rotation does not work since 2021.05]

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|QT5 touch screen rotation   |Kodi: even when not
                   |does not work since 2021.05 |enabled, forcefully selects
                   |                            |libevdev and libinput [was:
                   |                            |QT5 touch screen rotation
                   |                            |does not work since
                   |                            |2021.05]

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[Buildroot] [Bug 14206] Kodi: even when not enabled, forcefully selects libevdev and libinput [was: QT5 touch screen rotation does not work since 2021.05]

[bugzilla]

https://bugs.busybox.net/show_bug.cgi?id=14206

Yann E. MORIN <yann.morin.1998@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|REOPENED                    |RESOLVED

--- Comment #4 from Yann E. MORIN <yann.morin.1998@free.fr> ---
Thomas, All,

Thanks for the report. We believe the issue has now been fixed with commit
b80c488d04 (package/kodi: fix selection of dependencies).

Regards,
Yann E. MORIN.

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