Hi, On Mon, Mar 23, 2015 at 5:09 AM, Borislav Petkov <bp@xxxxxxxxx> wrote: > CC people. > > On Mon, Mar 23, 2015 at 11:21:02AM +0300, Лежанкин Иван wrote: >> Hi, >> >> after update from 3.18.7 to 3.19.x my Logitech touchpad became almost >> unusable. I use OpenSUSE Thumbleweed and tried both custom and vanilla >> kernels. AFAIK, the problem may come with this changes: >> http://lkml.iu.edu/hypermail/linux/kernel/1412.1/03246.html Indeed, in 3.19, the touchpad is switched into a "raw" mode where it forwards the multitouch points rather than using the mouse emulation mode. >> >> The symptoms are as follows. >> >> 1. The touch density is twice reduced: I have to make longer finger >> motion for a smaller pointer movement. Possibly, it's because the KDE >> starts to detect the touchpad as touchpad - and not the mouse as it >> was before - and applies some preferences like the pointer >> acceleration, etc. That's either a xorg-synaptics or a KDE bug. But that's somewhat expected. The synaptics driver was written a long time ago, at a time where the touchpads were quite small. With a touchpad this big, the xorg driver simply reduces the speed thinking that your finger is not moving much. Fortunately, in libinput (and so xf86-input-libinput too), we take into account the resolution and provide a consistent feeling across touchpads from different sizes. >> >> 2. Some gestures stopped to work: 3-finger swipe up, down, left, right >> - so, there are no more "history back-forward", "SuperKey", and >> "SuperKey + d". That's expected too, and I was not expecting people to rely that much on these features. Again, this should be handled by the upper layer, not by the kernel to provide a consistent experience with different touchpads. Libinput began to implement a gesture support, and maybe we should consider adding the 3 finger swipes to the supported gestures. >> >> 3. Multi-finger tap detection is awful: it doesn't detect 3-finger tap >> in 50%, it sometimes detects 2-finger tap instead of click+drag, or >> when the second finger is slightly touching the surface. That is worrisome. It might be a xorg-synaptics bug or a kernel one. We (Peter and I) both have a T650, so I guess we can try to reproduce this. We might need you to record some evemu traces of the various failures. >> >> Can anyone make a suggestion what should I do, but to stay on an older >> kernel version? To sum up, apologies for breaking your current setup. I still believe that we should not rely on the firmware to provide gestures because this generates kind of random shortcuts that are more or less properly handled by the desktop environment. That being said, it broke your setup, so I will add a parameter that you can pass on boot to disable this mode. It's not ideal though, I concede. I'll come back to you once I have something you can test. Jiri, Peter, Hans, if any of you has a better solution (beside reverting the raw mode) or want to add something, please do. Cheers, Benjamin >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> > > -- > Regards/Gruss, > Boris. > > ECO tip #101: Trim your mails when you reply. > -- > -- > To unsubscribe from this list: send the line "unsubscribe linux-input" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
