QT5 on IMX6q - graphics stuttering after HDMI reconnect
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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@30Hz on a HDMI-connected monitor.
Everything is fine after the application starts but when the HDMI cable is dis- and reconnected or we reset the resolution at runtime via writing to /sys/class/graphics/fb0/mode 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:
- 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 cound try next? We're OK with patching kernel or QT code.
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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@30Hz on a HDMI-connected monitor.
Everything is fine after the application starts but when the HDMI cable is dis- and reconnected or we reset the resolution at runtime via writing to /sys/class/graphics/fb0/mode 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:
- 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 cound try next? We're OK with patching kernel or QT code.
hi @rickp and welcome,
I don't think this is an issue that many user's have encountered.
So I would suggest to bring this on the mailing list of Qt.You may have more luck there.
