Red Hat Bugzilla – Bug 106586
Wheel mouse scroll up/down generates two X events
Last modified: 2007-04-18 12:58:14 EDT
Description of problem: I have a USB wheel mouse that works great, except that wheel up/down generates TWO X button press/release events, not one. This means scrolling in Mozilla, gnome-terminal and other applications always scrolls too much. In Mozilla, where I have Ctrl-wheel scroll a page, it always does two pages at a time. Version-Release number of selected component (if applicable): XFree86-4.3.0-2 How reproducible: Always. Steps to Reproduce: 1. Run xev. 2. Move mouse over the xev window, use the wheel to scroll up/down. Actual results: Two pairs of ButtonPress/ButtonRelease events are occurring for each single scroll. Expected results: Only a single pair of button press/release events should happen. Additional info: I've tried two USB mice, both standard Dell-issued intellimice. They have worked fine on other Dell Red Hat 9 machines.
Attach your X server log file, config file, and /var/log/messages file as uncompressed file attachments using the link below.
After looking through some other bugs for RH9/XFree86, I diffed the XF86Config between this box (with the problem) and another identically configured Dell machine, and the problem came down to this one difference in the ServerLayout section: InputDevice "DevInputMice" "AlwaysCore" If I remove that line, the mouse wheel works correctly. Based on the comments in bug #89061, either redhat-config-xfree86 should keep that line out of XF86Config unless it really needs to be there (e.g. laptops with two mouse devices), or it's a XFree86 driver bug.
Ok, so I tried removing my XF86Config, and running redhat-config-xfree86, and the resulting XF86Config file didn't have the AlwaysCore option (nor a SendCoreEvents). So I'm not sure how it got there in the first place... Does redhat-config-mouse change XF86Config? Between this problem and another one in GNOME that turned out to be nothing, I ran redhat-config-mouse quite a bit before finalizing on the current, working setting.
Not sure, I'm not involved in config tool development. I've Cc'd Brent however for comment.
Yes, redhat-config-mouse does change XF86Config. With the 2.6 kernel, all mice will use the same kernel device (/dev/input/mice), so mouse configuration becomes a non-issue. In fact, redhat-config-mouse has been taken out of the latest Rawhide trees because it isn't needed any more.