Description of problem:

After changing window focus, the scroll wheel on all generic USB mice I have tried do not respond correctly. The scroll position of the new window jumps randomly the first time you scroll in any direction, sometimes it will scroll straight to the bottom of a document, or straight to the top. Other times it jumps about 100-150 lines in either direction.

After it has freaked out and done one of these jumps the scroll wheel behavior returns to normal until the window focus changes again. It appears to do it on all windows and applications. It is especially annoying when I switch from Firefox to Bluefish and then I am thrown to the bottom or the top of whatever script I am working on, and have to scroll several hundred lines back to the position I am trying to work at.

Scrolling with the touch pad works normally.


Steps to Reproduce:

1. Open Google on Firefox and put in any old criteria.

2. Open a document in Bluefish/gedit/whatever thats about 300 lines long, scroll to the middle of this document.

3. Go back to firefox, scroll down the page, change to the next page of search results, scroll about a bit.

4. Change back to bluefish, move your scroll wheel one notch in either direction. The scroll position of the document should jump a huge amount, then scroll wheel will behave normally again until you change window focus.

Actual results:

Half of your working day is spent scrolling back to the right position. Serious injuries occur when you repeatedly slam your head into the desk in frustration.


Expected results: Obviously, none of the above.


Additional info:

I tried several other mice and they all did the same thing. I tried disabling the touch pad in case it was somehow being triggered. I tried fiddling with the other mouse settings but it wasn't having any of it.