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justin_brody
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PostPosted: Fri Jun 21, 2019 4:28 pm    Post subject: Help with Touchpad Reply with quote

Hello,
I was wondering if anyone has experience with a Dell 0820 touchpad (it's on a new Precision 3530 Laptop).

The touchpad is picked up:
Code:

~ $ dmesg | grep -i touchpad
[    1.267506] input: DELL0820:00 044E:121F Touchpad as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-9/i2c-DELL0820:00/0018:044E:121F.0001/input/input

~ $ xinput list
â¡ Virtual core pointer                         id=2    [master pointer  (3)]
â   â³ Virtual core XTEST pointer               id=4    [slave  pointer  (2)]
â   â³ DELL0820:00 044E:121F Mouse              id=11   [slave  pointer  (2)]
â   â³ DELL0820:00 044E:121F Touchpad           id=12   [slave  pointer  (2)]
⣠Virtual core keyboard                        id=3    [master keyboard (2)]
    â³ Virtual core XTEST keyboard              id=5    [slave  keyboard (3)]
    â³ Power Button                             id=6    [slave  keyboard (3)]
    â³ Video Bus                                id=7    [slave  keyboard (3)]
    â³ Video Bus                                id=8    [slave  keyboard (3)]
    â³ Power Button                             id=9    [slave  keyboard (3)]
    â³ Sleep Button                             id=10   [slave  keyboard (3)]
    â³ DELL0820:00 044E:121F                    id=13   [slave  keyboard (3)]
    â³ AT Translated Set 2 keyboard             id=14   [slave  keyboard (3)]

and works o.k. But it's not picked up as a synpatics or ALPS device (I'm not sure if it *is* synaptics or ALPS). The thing I'd really like to be able to do is adjust the sensitivity. When I go the mouse/touchpad configuration app in XFCE, I get menus to adjust the Mouse and the Touchpad. The mouse can adjust acceleration but not sensitivity -- this changes the acceleration for the touchpad. Adjusting the "touchpad" doesn't seem to have any effect.

I'm guessing I just need to switch on the right kernel setting, but I don't know what? Here's a link to my kernel config: https://drive.google.com/open?id=1UC1uy_d-vZ57YkHdbfln8MvLFKMGmzs9

(Indicdentally, not sure if this is the best way to post my kernel config; happy for suggestions of better ways).

Also, for what it's worth I'm thinking the touchpad is not necessarily 0820, that seems to be the sku of the laptop (from lshw)
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Hu
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Joined: 06 Mar 2007
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PostPosted: Sat Jun 22, 2019 4:28 am    Post subject: Reply with quote

A pastebin is preferable, since it will render without running Google Javascript, and it provides an easy way to curl the file to local storage if the reader wants to examine the file offline or process it with shell tools. wgetpaste can upload files to a pastebin for you.
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LIsLinuxIsSogood
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PostPosted: Sat Jun 22, 2019 5:46 am    Post subject: Reply with quote

justin_brody, so i know not ideal response but I am aware that other than the sensitivity issue that makes sense, are there any other problems with it as of right now? Your dmesg output was helpful because it shows the touchpad device is 044E:121F, which may be showing up with Dell Laptop ID under lshw I don't know why, but probably has more to do with the circuitry of the board or equipment when it was designed and chances are that touchpad is in use with other laptops. Also definitely download wgetpaste or some other pastebin tool as it becomes a must have when posting bits and pieces like your kernel config or whatever else is too long to fit here.

Some very crude examples of google search results that I found include some from the not so reliable Ubuntu that probably certifies these systems without any real testing or configuration. (Not really even sure what a certification means for a system, can it get a pay increase, ha)
https://certification.ubuntu.com/hardware/201802-26115/
https://certification.ubuntu.com/hardware/201802-26113/

A more informative link from dell, on a similar touchpad to yours (I believe),
https://www.dell.com/community/Latitude/Latitude-7490-windows-7-touchpad-driver/td-p/6100379
That might explain why some drivers for this particular device are just not available (to the windows community at least). And generally speaking, while I'm not a kernel or hardware expert but if stuff doesn't work on windows and/or ubuntu sometimes then it is a pretty good chance that it won't work elsewhere. :(
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Dominique_71
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PostPosted: Sat Jun 22, 2019 9:12 am    Post subject: Reply with quote

LIsLinuxIsSogood wrote:
And generally speaking, while I'm not a kernel or hardware expert but if stuff doesn't work on windows and/or ubuntu sometimes then it is a pretty good chance that it won't work elsewhere. :(

I desagree. With my Asus laptop, befaore installing linux, I did try several distributions inclusive Debian, Suse and Ubuntu, but the only one that gave me a full hardware recognizion was gentoo. One issue I get with the touchpad is than, with kernel distribution that provide all possible drivers, the wrong one is loaded at boot time. One possibility is to force the right one with a kernel parameter or with the module blacklist, the other one is to try different kernels with only one driver at a time.
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LIsLinuxIsSogood
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PostPosted: Sat Jun 22, 2019 4:48 pm    Post subject: Reply with quote

Running down the list of what to try:
1) Check the X configuration files to see what adjustments can be made, but this may be made easier after the correct drivers are present
2) Try different drivers for your touchpad - there are only a few implementations

Can you please post back the names of files in the directory for /etc/X11/xorg.conf/? Run ls commnd and post output back.
Also contents of make.conf file, use emerge --info so that we can see the global settings on your system as well.
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LIsLinuxIsSogood
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PostPosted: Thu Aug 01, 2019 9:50 pm    Post subject: Reply with quote

Dominique_71 has a good point to make since it depends what the hardware is built upon. Personally I would stay as far away from a Dell computer as possible as they don't make their own parts, so you don't know what you're going to get! ASUS on the other hand, Lenovo, and even my HP laptop have all seemed to make installing and maintaining a linux machine on them a bit more feasible. That is not to say it won't work with Dell, but there's still a smaller chance IMHO that it should work there.
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