Framebuffer cursor blinking after Application exit

Simon2210

Hi,

my QWidget-Application uses the linux framebuffer directly.
By default the console cursor is drawn at the top left corner. I prevent it by setting "vt.global_cursor_default=0" in my bootloader and export "QT_QPA_PLATFORM="linuxfb:tty=/dev/null" at runtime.

Only if my application is finished, the cursor is shown again.
I would like to know why the exit causes the cursor to reappear.
Does anyone have an idea?

Thank you.

SGaist

Hi and welcome to devnet,

What version of Qt are you using ?
On what distribution ?

How are you starting your application ?
How are you stopping it ?

Simon2210

Thanks,

I'm using Qt 5.6.1. The distribution based on arm and is selfmade by buildroot. There is no window-server installed. It is running on a cl-som-imx7 from compulab.
I start the application (without arguments) via SSH or at startup with the start-stop-daemon tool as background process with the following environment:

export TSLIB_TSEVENTTYPE=H3600
export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event2
export TSLIB_CALIBFILE=/etc/pointercal
export TSLIB_CONFFILE=/etc/ts.conf

export QT_QPA_FB_DISABLE_INPUT=1
export QT_QPA_GENERIC_PLUGINS="evdevkeyboard:/dev/input/event0,tslib:/dev/input/event2"
export QT_QPA_PLATFORM="linuxfb:tty=/dev/null"

I can stopping it by "QApplication::exit()", SIGINT or SIGTERM - always the same behavior.

SGaist

Did you try echo 0 > /sys/class/graphics/fbcon/cursor_blink before starting your application ?

Unsolved Framebuffer cursor blinking after Application exit