How to remove/change the gradient of QToolButton without setStyleSheet

[russe]

I change the background color of my widget with this

palette = widget.palette()
palette.setColor(widget.backgroundRole(), QColor("red"))
widget.setPalette(palette)
widget.setAutoFillBackground(True)

But on a QToolButton the background look more "pink" than "red".
I try other "QStyleFactory" and some work correctly.
But if I use the default style on my ubuntu I had a gradient background and I doesn't had my color.

Can I remove or change the gradient of background.

PS. I try to change the background with setStyleSheet, it work. But my application always crash after a few change on same widget. I need to change the background color of many widget at the same time and many time on same widget.

[SGaist]

Hi and welcome to devnet,

Do you have that only on Ubuntu ?

What desktop environment do you use ?