Multiple displays support on i.MX8 and EGLFS

[diegor]

Hi all,

I'm interested in the level of support for multiple displays on i.MX8, in particular i.MX8M, when using Qt EGLFS backend.
By reading this article:
https://www.qt.io/blog/2016/09/19/qt-graphics-with-multiple-displays-on-embedded-linux
I understand that the best case "[1] Output management is available" is available when using KMS/DRM with GBM buffers.
i.MX8 SOCs drivers do support KMS, but I see in the sources that:

EGLFS_DEVICE_INTEGRATION = eglfs_viv

is used rather than eglfs_kms:
https://code.qt.io/cgit/yocto/meta-boot2qt.git/tree/meta-boot2qt-distro/recipes-qt/qt5/qtbase/mx8/oe-device-extra.pri?h=warrior

Does that mean that i.MX8 is currently limited to "[2] Qt applications can choose at launch time which single screen to output to, but apart from this static setting no other configuration option is provided." as i.MX6?

Thank you,
Diego

[diegor]

Anybody knows?

[SGaist]

Hi and welcome to devnet,

I would bring this question to the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

[diegor]

Thank you, I've posted the question there (unfortunately detected as spam):
https://lists.qt-project.org/pipermail/interest/2019-September/033861.html