[gentoo-user] Mouse wheel makes firefox hang

[Hervé Guillemet]

Hello,

After a recent system update I get this annoying strange behavior: when 
scrolling in a firefox or thunderbird window with the mouse wheel, the 
full X interface freezes for some seconds, then a system beep is emitted 
and the interface unfreezes, but most of the time the mouse cursor 
becomes invisible. I must restart X to get it back.
Scrolling with scrollbars or arrow keys works.
Scrolling with wheels in others apps like terminals works too.
No useful message in syslog, dmesg or console.

I tried various things, like downgrading firefox and thunderbird to the 
version I used before the upgrade, compiling without the system-libXX 
use flags, downgrading the nvidia drivers, upgrading the kernel, etc... 
without success.

Any idea ?

-- 
Hervé