Mouse wheel scrolls browser history, not working otherwise
 

The mouse wheel used to work. After I installed proprietary drivers for my sound, it no longer worked. I don't really get that part.

In the browser, scroll wheel movement moves the browser back/forward through the window history, like clicking the back or forward buttons. Outside the browser, pretty much nothing.

Excerpt from xev: when I scroll the wheel backwards:

8<----------------------------------------------------->8
KeymapNotify event, serial 33, synthetic NO, window 0x0,
keys: 4294967203 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

ButtonRelease event, serial 33, synthetic NO, window 0x2800001,
root 0xa3, subw 0x2800002, time 796252327, (48,26), root:(344,493),
state 0x0, button 9, same_screen YES

LeaveNotify event, serial 33, synthetic NO, window 0x2800001,
root 0xa3, subw 0x0, time 796252327, (48,26), root:(344,493),
mode NotifyUngrab, detail NotifyInferior, same_screen YES,
focus YES, state 0
8<----------------------------------------------------->8

xorg.conf:

8<----------------------------------------------------->8
Identifier "Mouse1"
Driver "mouse"
Option "Protocol" "Auto"
Option "Buttons" "9"
Option "ZAxisMapping" "8 9"
8<----------------------------------------------------->8

I added the ZAxisMapping entry based on the fact that the xev output seems to be identifying the wheel as button 9. However, I tried a number of other possibilities; and the line was not in there prior to the failure point, i.e. when the mouse was working.

Hopefully, someone can point me in another direction to solve this. Besides the annoyance when I forget and go whizzing through browser history, I just miss being able to scroll web pages!

Slack 13.1, XFCE 4.4.3

Intel(R) Pentium(R) CPU G620 @ 2.60GHz dualcore
01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350]
01:00.1 Audio device: ATI Technologies Inc RV730XT Audio device [Radeon HD 4670]
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)

Thanks.

mp