topic Re: Flicker while starting Qt application in i.MX Processors

Flicker while starting Qt application

shyamjithkv — Fri, 03 Jun 2016 07:50:32 GMT

Hi,

I have an iMX6Q SABRE AI EVK with linux-2.6-imx-imx_3.14.52_1.1.0_ga (imx_v6_v7_defconfig) running on it.When I run a Qt5 application on it, instead of a smooth start, it shows a sudden initial glitch for a fraction of second and gets stabilized to normal.The below image will give a better understanding of problem.

Any help on this will be greatly appreciated.

Note: I am almost done with the work, so changing the kernel version is not recommended.

Re: Flicker while starting Qt application

Bio_TICFSL — Wed, 08 Jun 2016 16:15:51 GMT

Hi shyamjith,

Check your Xorg.conf should match one of the following cases:

_______________

1) Vivante driver:

Section "Device"

Identifier "i.MX Accelerated Framebuffer Device"

Driver "vivante"

Option "fbdev" "/dev/fb0"

Option "vivante_fbdev" "/dev/fb0"

Option "HWcursor" "false"

EndSection

Section "Screen"

Identifier "Default Screen"

Device "i.MX Accelerated Framebuffer Device"

EndSection

Section "ServerLayout"

Identifier "Default Layout"

Screen "Default Screen"

EndSection

_______________

2) fbdev:

Section "Device"

Identifier "Generic Framebuffer Device"

Driver "fbdev"

Option "fbdev" "/dev/fb0"

Option "HWcursor" "false"

EndSection

Section "Screen"

Identifier "Default Screen"

Device "i.MX Accelerated Framebuffer Device"

EndSection

Section "ServerLayout"

Identifier "Default Layout"

Screen "Default Screen"

EndSection

as well chek /var/log/Xorg.0.log to see if there were any initialization errors that occurred at startup.

Hope this helps

Re: Flicker while starting Qt application

shyamjithkv — Thu, 09 Jun 2016 05:09:00 GMT

Thank you for your time,

I am sorry i forgot to mention that i am using eglfs platform.

Kernel Version : linux-2.6-imx-imx_3.14.52_1.1.0_ga

Root File System : fsl-image-qt5-fb-imx6qdlsolo

Qt version : Qt 5.6.1 (static build)

Note : The vivante sample program /opt/viv_samples/vdk/Toutorial1 also have this flickering issue.

Thank,

shyamjith