Some more investigation pinpointed the problem to the kernel, not the X mouse driver.
In kernel 2.6.17 (which I had in 6.10), dmesg lines related to the mouse were [17179572.484000] mice: PS/2 mouse device common for all mice [17179592.040000] logips2pp: Detected unknown logitech mouse model 56 [17179592.568000] input: ImExPS/2 Logitech Explorer Mouse as /class/input/input2 "cat /sys/class/input/mouse0/device/protocol" shows the protocol as "ImExPS/2". In kernel 2.6.20, I get these instead: [ 18.320140] mice: PS/2 mouse device common for all mice [ 18.320606] input: Macintosh mouse button emulation as /class/input/input0 [ 40.291729] input: PS/2 Logitech Wheel Mouse as /class/input/input3 "cat /sys/class/input/mouse0/device/protocol" shows the protocol as "PS/2" (This despite model 56 supposedly being recognized by the driver since commit e3882bb56e31dbb3950e51c1ba914ef2f445650c) Unfortunately I won't have time in the near future to bisect this... Hopefully in a few weeks. Meanwhile I will be using kernel 2.6.17. (Are there instructions anywhere for bisecting kernel bugs in an Ubuntu system? Specifically, how do I run with a custom-built kernel?) ** Changed in: linux-source-2.6.20 (Ubuntu) Sourcepackagename: xserver-xorg-input-mouse => linux-source-2.6.20 -- Logitech optical mouse scroll wheel not working correctly https://bugs.launchpad.net/bugs/108523 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
