From: Po Lu <luangruo@yahoo.com>
To: Brian Cully <bjc@spork.org>
Cc: Eli Zaretskii <eliz@gnu.org>,
emacs-devel@gnu.org, larsi@gnus.org, rms@gnu.org,
monnier@iro.umontreal.ca
Subject: Re: master 3b41141708: Expose the name of an event's input device to Lisp
Date: Mon, 11 Apr 2022 10:00:36 +0800 [thread overview]
Message-ID: <87pmlo5qgr.fsf@yahoo.com> (raw)
In-Reply-To: <87ee24xuv6.fsf@ditto.jhoto.spork.org> (Brian Cully's message of "Sun, 10 Apr 2022 21:08:29 -0400")
Brian Cully <bjc@spork.org> writes:
> That would be because the only way that USB has to disambiguate
> otherwise identical devices is by serial number. You can verify this
> yourself, if you like, by looking at the output of ‘lsusb -v’. I have
> demonstrated that libinput does not use that information to name devices
> and has no apparent problem re-using the same name across multiple
> devices.
libinput is libinput. It is a driver for the X server, but it is
otherwise completely unrelated to the X input extension, which can only
operate correctly if each name uniquely identifies a device.
> Is libinput being used for your mice? I suspect that the
> discrepancy may arrive from different driver usage.
libinput is the device driver being used, yes.
> So, I’d originally flashed my microcontroller because I thought
> it would be the easiest way to test things, and while I do have
> duplicate devices in my home, they’re Steam Controllers and I didn’t
> think it worth digging them out of storage for this. However, in the
> interest of using “real” devices, here’s the output of ‘libinput
> list-devices’ with them plugged in.
>
> ---[snip]---
> Device: Valve Software Steam Controller
> Kernel: /dev/input/event30
> Group: 4
> Seat: seat0, default
> Capabilities: keyboard pointer
> ⋮
> Device: Valve Software Steam Controller
> Kernel: /dev/input/event29
> Group: 5
> Seat: seat0, default
> Capabilities: keyboard pointer
> ---[snip]---
>
> They work in X just fine.
Then either the names are different, or the devices behave identically
in every way, and nobody has yet had a reason to treat the devices
differently. If the second "Valve Software Steam Controller" was a foot
pedal, I'm certain it would not be working correctly in software
designed for that foot pedal.
Anyway, that "they work fine in X" proves this is not a problem in
practice, so we will wait until someone actually complains in real word
usage.
> Here are the logs about their mouse functionality:
Did you try asking for the device name using the xinput tool? What does
it say?
Also, what happens if you run `xinput list-props "Valve Software Steam
Controller"'? Can you show the output?
next prev parent reply other threads:[~2022-04-11 2:00 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <164933858147.29834.15050766441005536059@vcs2.savannah.gnu.org>
[not found] ` <20220407133623.9C209C009A8@vcs2.savannah.gnu.org>
2022-04-07 14:05 ` master 3b41141708: Expose the name of an event's input device to Lisp Stefan Monnier
2022-04-07 23:31 ` Po Lu
2022-04-07 23:41 ` Stefan Monnier
2022-04-08 0:07 ` Po Lu
2022-04-08 6:02 ` Eli Zaretskii
2022-04-08 6:08 ` Po Lu
2022-04-08 6:26 ` Eli Zaretskii
2022-04-08 7:36 ` Po Lu
2022-04-08 11:12 ` Eli Zaretskii
2022-04-08 11:31 ` Po Lu
2022-04-08 12:12 ` Eli Zaretskii
2022-04-08 12:35 ` Po Lu
2022-04-09 6:48 ` Eli Zaretskii
2022-04-09 9:06 ` Po Lu
2022-04-09 9:09 ` Lars Ingebrigtsen
2022-04-09 9:30 ` Eli Zaretskii
2022-04-09 10:03 ` Po Lu
2022-04-09 11:03 ` Eli Zaretskii
2022-04-09 11:44 ` Po Lu
2022-04-09 14:04 ` Eli Zaretskii
2022-04-09 16:33 ` Stefan Monnier
2022-04-09 16:41 ` Lars Ingebrigtsen
2022-04-09 17:06 ` Eli Zaretskii
2022-04-09 17:16 ` Eli Zaretskii
2022-04-09 17:52 ` Brian Cully
2022-04-09 19:18 ` Eli Zaretskii
2022-04-10 0:54 ` Po Lu
2022-04-10 1:46 ` Brian Cully
2022-04-10 2:11 ` Po Lu
2022-04-10 2:45 ` Brian Cully
2022-04-10 3:30 ` Po Lu
2022-04-10 0:37 ` Po Lu
2022-04-10 5:49 ` Eli Zaretskii
2022-04-10 6:09 ` Po Lu
2022-04-10 6:44 ` Eli Zaretskii
2022-04-10 7:31 ` Po Lu
2022-04-10 8:28 ` Eli Zaretskii
2022-04-10 8:50 ` Po Lu
2022-04-10 9:17 ` Eli Zaretskii
2022-04-10 9:25 ` Po Lu
2022-04-10 11:15 ` Po Lu
2022-04-10 15:16 ` Stefan Monnier
2022-04-11 1:02 ` Po Lu
2022-04-10 11:46 ` Lars Ingebrigtsen
2022-04-10 11:41 ` Lars Ingebrigtsen
2022-04-10 0:48 ` Po Lu
2022-04-10 6:04 ` Eli Zaretskii
2022-04-10 6:17 ` Po Lu
2022-04-10 6:49 ` Eli Zaretskii
2022-04-10 7:01 ` Po Lu
2022-04-10 8:24 ` Eli Zaretskii
2022-04-10 8:42 ` Po Lu
2022-04-10 9:13 ` Eli Zaretskii
2022-04-10 12:51 ` Brian Cully
2022-04-10 13:21 ` Po Lu
2022-04-10 18:08 ` Brian Cully
2022-04-11 0:58 ` Po Lu
2022-04-11 1:08 ` Brian Cully
2022-04-11 2:00 ` Po Lu [this message]
2022-04-11 2:03 ` Po Lu
2022-04-11 2:21 ` Brian Cully
2022-04-11 3:12 ` Po Lu
2022-04-11 4:11 ` Brian Cully
2022-04-11 5:20 ` Po Lu
2022-04-11 11:33 ` Brian Cully
2022-04-11 14:09 ` Po Lu
2022-04-11 16:26 ` Brian Cully
2022-04-11 10:10 ` Lars Ingebrigtsen
2022-04-10 12:44 ` Brian Cully
2022-04-10 13:14 ` Po Lu
2022-04-08 14:27 ` Stefan Monnier
2022-04-09 0:24 ` Po Lu
2022-04-09 2:52 ` Stefan Monnier
2022-04-09 3:17 ` Po Lu
2022-04-09 13:31 ` Stefan Monnier
2022-04-09 13:37 ` Po Lu
2022-04-09 14:20 ` Stefan Monnier
2022-04-10 0:58 ` Po Lu
2022-04-09 14:31 ` Eli Zaretskii
2022-04-10 0:56 ` Po Lu
2022-04-10 6:11 ` Eli Zaretskii
2022-04-10 6:23 ` Po Lu
2022-04-10 6:52 ` Eli Zaretskii
2022-04-10 7:37 ` Po Lu
2022-04-10 8:12 ` Eli Zaretskii
2022-04-09 6:22 ` Eli Zaretskii
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