[Interest] QT5 on IMX6 quad - graphics stuttering after HDMI reconnect

[Rick Pannen]

Hi,

we have an embedded QT5 application running on an IMX6 quad system. The OS
is Yocto sumo (kernel 4.9.67) and the QT app is running fullscreen on eglfs
at 1920x1080 at 30Hz on a HDMI-connected monitor.

Everything is fine after the application starts but when the HDMI cable is
dis- and reconnected the application starts dropping frames (Animations
that ran smooth before start stuttering). The problem goes away when the QT
application is restarted.

What we tried until now without success:

 - Changing the resolution
 - Using different monitors
 - Enabling HDMI at boot through the video parameter of the kernel command
line
 - Upgrading Yocto to warrior

Do you have any hints on what might cause this and what we could try next?
We're OK with patching kernel or QT code.


Cheers,
Rick
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