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Description of problem: Touchpad jerky/freezes/jerky Version-Release number of selected component (if applicable): fc23, fc24 & fc25 (went back to fc24 for now) on a Dell latitude E5420. How reproducible: Happens always .. UNLESS .. ethernet cable is plugged in. In which case, touchpad works fine. (Dual-boot system; Boot on Windows & touchpad works fine.) Steps to Reproduce: 1. Boot-up 2. Try to move cursor 3. Actual results: Cursor moves/freezes/moves (jerky) Expected results: Smooth movement in the direction requested Additional info: Since it works fine with cable connected to LAN, tried with just WiFi - still jerky. Seems pretty strange to me that it works only when wired network.
Also ... Because this laptop has one of those little "jpy-sticks" within the keypad, tried that as well. It works just fine!
Meant to say "JOY-stick"
weird. sounds like a hardware issue, I wonder if there's some earthing problem or something. Do you notice a difference whether you're on battery power or plugged in? What's the evemu-describe of the touchpad and your dmesg? I wonder if windows is using a different protocol to drive it and that exposes the bug. Also, when you run evemu-record, do you see the freezes happening in the log, i.e. no events scrolling past whenever the cursor freezes? If so, that further indicates a hw (or kernel) issue. Are you under Wayland or Xorg? any difference between the two?
Sorry - I don't even know what Wayland is. But I've pretty much ruled-out h/w problem as I tried the Mint OS also, and like with Windows; no jerky/freeze touchpad. Just now tried it (first time) on battery power. Oh-wow ... weirder yet. On battery power, no jerky/freeze. Then, plugged external power back in and - zap, back to jerky/freeze. On 12/07/2016 09:37 PM, bugzilla wrote: > https://bugzilla.redhat.com/show_bug.cgi?id=1402629 > > > > --- Comment #3 from Peter Hutterer <peter.hutterer> --- > weird. sounds like a hardware issue, I wonder if there's some earthing problem > or something. Do you notice a difference whether you're on battery power or > plugged in? > > What's the evemu-describe of the touchpad and your dmesg? I wonder if windows > is using a different protocol to drive it and that exposes the bug. > > Also, when you run evemu-record, do you see the freezes happening in the log, > i.e. no events scrolling past whenever the cursor freezes? If so, that further > indicates a hw (or kernel) issue. > > Are you under Wayland or Xorg? any difference between the two? >
I am now convinced this is a hardware problem. Tried a different (Dell) charger (19.5V, 4.62A) and all works well. The other charger (that apparently caused the problem) is a Dell 19.5V, 3.5A. Tried yet another (After market) charger (19.5V, 3.5A) and got a BIO warning on boot-up that it was a non-Dell and performance may be impaired. Touchpad was jerky. So, obviously, a 4.62A charger is a necessity! I would close this bug if I knew how. Sorry for taking up your time. Maybe this will help someone else.
No worries, thanks for reporting back.