Bug 105923 - The touchpad disable/enable functionality does not work by double tapping on the LED zone in the upper left corner
Summary: The touchpad disable/enable functionality does not work by double tapping on ...
Status: RESOLVED MOVED
Alias: None
Product: Wayland
Classification: Unclassified
Component: libinput (show other bugs)
Version: unspecified
Hardware: Other All
: medium minor
Assignee: Wayland bug list
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Reported: 2018-04-06 07:57 UTC by Alexey Svistunov
Modified: 2018-04-11 23:01 UTC (History)
2 users (show)

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Description Alexey Svistunov 2018-04-06 07:57:00 UTC 
Almost all HP ProBooks and EliteBooks use Synaptics touchpads with LED in the upper left corner and a have a disable/enable functionality by double tapping on the this LED zone. It does not work under Linux, neither LED nor switching.
I have this issue with openSUSE Leap on HP ProBook 4525s. I am ready to provide any information about the hardware, logs and more which you might need.
Comment 1 Peter Hutterer 2018-04-06 08:37:09 UTC 
Does the kernel expose the LED? without that, we can't really do much. And the next problem is going to be write access to the LED which we're unlikely to get unless we're root.
Comment 2 Alexey Svistunov 2018-04-11 08:46:58 UTC 
No, the LED is not exposed by the kernel, /sys/class/leds/psmouse::synaptics/ is absent. But there is a patch (https://aur.archlinux.org/packages/synaptics-led/) for the psmouse module in Arch Linux, which adds this. I do not have enough skills to submit it to the kernel.
Comment 3 Peter Hutterer 2018-04-11 23:01:55 UTC 
hmm, so it comes down to: we can't merge this in libinput until we figure out how the LED behaves. And that requires the kernel patch to be merged upstream. Magically disabling the touchpad with no feedback to the user is not something I want to do, I get enough angry emails already.

Also note that we've been slowly switching synaptics touchpads in the kernel to SMBus/RMI4 where possible so that LED patch would likely have to work for that too.

Closing this bug for now, please re-open when the kernel solution is in place. The libinput bit isn't that hard to write.

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