** Changed in: linux (Ubuntu)
Status: Expired = Incomplete
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https://bugs.launchpad.net/bugs/1320022
Title:
[Dell Latitude E6540] ALPS touchpad keeps having state
Øyvind, I experienced that when I upgraded to BIOS A10 from A08.
Fortunately, I was able to downgrade from A10 back to A08. I suspect
that either A10 has an issue or it just pokes even harder at this bug
than A08 did. (A10 cites Keyboard input improvement as one of its
fixes, which is probably
There's no actual regression though because, although the generic mouse
driver doesn't have the sync issue, using it is even worse since it
doesn't expose any touchpad-specific functionality.
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Allan, do the older kernels that don't seem to exhibit the bug recognize
the touchpad as a touchpad? For instance, with the older kernels that
don't seem to exhibit the bug, does the 'xinput' command list a generic
mouse instead of what's normally listed as your touchpad?
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This sync issue with the E7440 touchpad can cause spurious clicks too.
One thing that I found helps is to add psmouse.resetafter=1 to
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub (and then run update-
grub and reboot).
This will cause the driver to reset when it loses sync, causing the
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