With nouveau all working good. But after installing legacy 340.108 nvidia driver for my gf9800 i have Segmentation Fault at launching all Qt GUI software. And opposite, Qt works again after uninstalling nvidia driver.
But very strange that if i run Qt soft via debugging tools such gdb or strace i have no errors.
gdb ./qbittorrent strace ./qbittorrent
Only two Qt application starting normally - CMake GUI and Audacious Qt theme
Is where any solution to fix this? Who can fix this Debian or Qt devs?