Bug 1230446
| Summary: | trackpad palm detection needs improvement (Cypress APA on Acer c720) | ||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Wade Berrier <wberrier> | ||||||||
| Component: | libinput | Assignee: | Peter Hutterer <peter.hutterer> | ||||||||
| Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||
| Severity: | unspecified | Docs Contact: | |||||||||
| Priority: | unspecified | ||||||||||
| Version: | 22 | CC: | marco.laverdiere, parrenin, peter.hutterer, wberrier | ||||||||
| Target Milestone: | --- | ||||||||||
| Target Release: | --- | ||||||||||
| Hardware: | Unspecified | ||||||||||
| OS: | Unspecified | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||||
| Doc Text: | Story Points: | --- | |||||||||
| Clone Of: | Environment: | ||||||||||
| Last Closed: | 2016-07-19 14:46:02 UTC | Type: | Bug | ||||||||
| Regression: | --- | Mount Type: | --- | ||||||||
| Documentation: | --- | CRM: | |||||||||
| Verified Versions: | Category: | --- | |||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||
| Embargoed: | |||||||||||
| Attachments: |
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Created attachment 1037455 [details]
multiple palm events
run an evemu-record | grep ABS_MT_PRESSURE please and try to get a feel for the pressure range on a touchpad vs the pressure range on a normal finger. The second recording has a few that max out to 255, but it'd be good to know what the pressure is for a normal finger event. Created attachment 1043711 [details]
ABS_MT_PRESSURE recording
If I'm understanding you correctly, here's a recording of just pressure doing normal finger movement.
Recorded are:
moving the pointer
soft clicks and double clicks
hard clicks and double clicks
two finger scrolling (vertical and horizontal)
As a side note: I was surprised to see that pressure for palm touches was so much higher. Is that normal for trackpads? This is probably what you're getting at, but at least for this trackpad, it seems that filtering based on pressure alone would be enough to detect palm events.
pressure on touchpads is really the size of surface area and based on the premise that by pushing down on a touchpad, your finger compresses and thus widens. that larger surface area is touchpads then export as pressure. and that's why thumbs and palms can be measured by looking at pressure. it looks like this is in line with recordings from other touchpads I've seen where normal finger press doesn't go near/above the pressure 100 mark. so we should be able to use that (eventually :) I don't know if it's related or not with palm detection, but in my case, I do observe that since F22, my trackpad behaviour is weird/inconsistent, especially with operations like drag&drop, selections, etc. It seems that the touchpad is really capricious on where/how the finger touches the pad surface. The same hardware under others OS (Ubuntu or Windows) or under other desktop environment (KDE) works perfectly. mlaverdiere: do you have the same laptop model? If not, please file a separate bug so it doesn't get overlooked. thanks. http://wayland.freedesktop.org/libinput/doc/latest/reporting_bugs.html has a list of things required to debug issues with touchpads Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed. |
Created attachment 1037454 [details] a single palm event Description of problem: the tarckpad picks up events while trying to type, often introducing errors in the text, or by introducing spurious click events. Version-Release number of selected component (if applicable): 0.17.0-1.fc22 How reproducible: Happens very often. Steps to Reproduce: This can be reproduced a couple of ways: 1. do a lot of typing and the cursor will end up in a different spot messing up the typing 2. or, tap the trackpad with your palm and notice the cursor moves, often involving a click Actual results: Pointer moves all over, clicks are performed. Expected results: Spurious pointer movement or clicks shouldn't be generated.