Punting to the kernel, if evtest doesn't show the device it's a kernel issue. Just to confirm though: does /proc/bus/input/devices list the device at all? If so, what's the entry for it?

Doesn't look like it's showing up in there, either.

I am afraid one of my commits might have broken your gamepad. Could you please install hid-replay and provide me the output of hid-recorder (running as root) for your gamepad?
Ideally, add some events in the output so I can have a basis to reproduce locally.

Looks like the controller isn't even showing up in here, either...

[Karai@monolith ~] $ sudo hid-recorder
Available devices:
/dev/hidraw1:	Logitech USB Keyboard
/dev/hidraw2:	Logitech USB Keyboard
/dev/hidraw3:	BLUE MICROPHONE Blue Snowball 
/dev/hidraw5:	HUION Pentablet
/dev/hidraw6:	HUION Pentablet
/dev/hidraw7:	Logitech USB Receiver
/dev/hidraw8:	HUION Pentablet
/dev/hidraw9:	Logitech M510
Select the device event number [0-7]: ^C

But when I run journalctl -f again, I can watch the events of plugging it in and whatnot...

Weird.

Could you run the hid-recorder trace on a working kernel? (4.7.5)

Here is the output from my laptop running FC23~

[karai@tsubasa ~] $ journalctl -f
-- Logs begin at Mon 2016-05-09 13:47:49 ADT. --
Nov 09 22:53:47 tsubasa kernel: usb 3-1: new full-speed USB device number 2 using xhci_hcd
Nov 09 22:53:47 tsubasa kernel: usb 3-1: New USB device found, idVendor=1235, idProduct=ab20
Nov 09 22:53:47 tsubasa kernel: usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
Nov 09 22:53:47 tsubasa kernel: usb 3-1: Product: SNES30 Joy    
Nov 09 22:53:47 tsubasa kernel: usb 3-1: Manufacturer: SNES30            
Nov 09 22:53:47 tsubasa kernel: input: SNES30             SNES30 Joy     as /devices/pci0000:00/0000:00:1c.7/0000:25:00.0/usb3/3-1/3-1:1.0/0003:1235:AB20.0001/input/input23
Nov 09 22:53:47 tsubasa kernel: hid-generic 0003:1235:AB20.0001: input,hidraw0: USB HID v1.10 Joystick [SNES30             SNES30 Joy    ] on usb-0000:25:00.0-1/input0
Nov 09 22:53:47 tsubasa mtp-probe[12658]: checking bus 3, device 2: "/sys/devices/pci0000:00/0000:00:1c.7/0000:25:00.0/usb3/3-1"
Nov 09 22:53:47 tsubasa mtp-probe[12658]: bus: 3, device: 2 was not an MTP device
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) config/udev: Adding input device SNES30             SNES30 Joy     (/dev/input/js1)
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) No input driver specified, ignoring this device.
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) This device may have been added with another device file.
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) config/udev: Adding input device SNES30             SNES30 Joy     (/dev/input/event17)
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) No input driver specified, ignoring this device.
Nov 09 22:53:47 tsubasa /usr/libexec/gdm-x-session[1607]: (II) This device may have been added with another device file.
Nov 09 22:53:51 tsubasa PackageKit[1316]: get-updates transaction /3508_bcceeded from uid 1000 finished with success after 318ms
^C


[karai@tsubasa ~] $ sudo hid-recorder
Available devices:
/dev/hidraw0:	SNES30             SNES30 Joy    
Select the device event number [0-0]: 0
D: 0
R: 99 05 01 09 04 a1 01 a1 02 75 08 95 04 15 00 26 ff 00 35 00 46 ff 00 09 30 09 31 09 32 09 35 81 02 75 04 95 01 25 07 46 3b 01 65 14 09 39 81 42 65 00 75 01 95 0c 25 01 45 01 05 09 19 01 29 0c 81 02 06 00 ff 75 01 95 08 25 01 45 01 09 01 81 02 c0 a1 02 75 08 95 08 46 ff 00 26 ff 00 09 02 91 02 c0 c0
N: SNES30             SNES30 Joy    
P: usb-0000:25:00.0-1/input0
I: 3 1235 ab20
D: 0
E: 0.000001 7 80 80 80 80 0f 80 00
E: 0.223942 7 80 80 80 80 0f 00 00
E: 0.319948 7 80 80 80 80 0f 40 00
E: 0.543993 7 80 80 80 80 0f 00 00
E: 0.607929 7 80 80 80 80 2f 01 00
E: 0.671918 7 80 80 80 80 2f 09 00
E: 0.863884 7 ff 80 80 80 2f 0c 00
E: 0.895800 7 ff 80 80 80 0f 04 00
E: 0.927829 7 ff 00 80 80 0f 04 00
E: 0.959844 7 80 00 80 80 0f 04 00
E: 1.023910 7 00 00 80 80 0f 04 00
E: 1.055860 7 80 00 80 80 1f 00 00
E: 1.087888 7 80 80 80 80 1f 00 00
E: 1.119925 7 80 80 80 80 1f 08 00
E: 1.279864 7 80 00 80 80 0f 00 00
E: 1.439912 7 80 00 80 80 8f 00 00
E: 1.471903 7 80 80 80 80 8f 00 00
E: 1.631949 7 80 ff 80 80 0f 00 00
E: 1.759924 7 80 ff 80 80 0f 01 00
E: 1.791904 7 80 80 80 80 0f 01 00
E: 1.887802 7 80 80 80 80 2f 01 00
E: 1.919843 7 80 00 80 80 2f 00 00
E: 1.951820 7 00 00 80 80 2f 00 00
E: 1.983867 7 00 00 80 80 0f 00 00
E: 2.079896 7 80 80 80 80 3f 00 00
E: 2.207930 7 80 80 80 80 1f 00 00
E: 2.239872 7 00 00 80 80 1f 00 00
E: 2.271899 7 00 00 80 80 0f 00 00
E: 2.367951 7 80 00 80 80 8f 00 00
E: 2.399827 7 80 80 80 80 8f 00 00
E: 2.495918 7 80 00 80 80 8f 00 00
E: 2.559824 7 80 00 80 80 0f 00 00
E: 2.655799 7 80 80 80 80 0f 01 00
E: 2.815878 7 ff 80 80 80 0f 01 00
E: 2.847773 7 ff 80 80 80 0f 00 00
E: 2.879893 7 ff 80 80 80 0f 04 00
E: 2.943920 7 ff 00 80 80 0f 04 00
E: 2.975913 7 ff 80 80 80 0f 0d 00
E: 3.007890 7 80 80 80 80 0f 0d 00
E: 3.039853 7 80 80 80 80 2f 09 00
E: 3.167902 7 80 80 80 80 0f 09 00
E: 3.199893 7 80 80 80 80 0f 05 00
E: 3.231897 7 80 80 80 80 0f 04 00
E: 3.391899 7 80 80 80 80 0f 00 00
E: 3.423876 7 80 80 80 80 0f 01 00
E: 3.583882 7 80 80 80 80 0f 00 00
E: 3.615762 7 80 80 80 80 0f 40 00
E: 3.807923 7 80 80 80 80 0f c0 00
E: 3.871909 7 80 80 80 80 0f 80 00
E: 4.031834 7 80 ff 80 80 0f 00 00
E: 4.063864 7 ff ff 80 80 0f 00 00
E: 4.095857 7 ff ff 80 80 0f 04 00
E: 4.223928 7 ff ff 80 80 2f 05 00
E: 4.255735 7 ff 80 80 80 2f 05 00
E: 4.287727 7 80 80 80 80 2f 09 00
E: 4.415881 7 80 00 80 80 2f 0d 00
E: 4.447831 7 80 00 80 80 2f 05 00
E: 4.479870 7 00 00 80 80 0f 04 00
E: 4.575881 7 00 00 80 80 1f 04 00
E: 4.607795 7 80 80 80 80 9f 00 00
E: 4.703902 7 80 80 80 80 8f 00 00
E: 4.735815 7 80 00 80 80 8f 00 00
E: 4.767833 7 00 00 80 80 8f 00 00
E: 4.799849 7 00 00 80 80 0f 00 00
E: 4.831849 7 80 00 80 80 0f 00 00
E: 4.927911 7 80 00 80 80 2f 01 00
E: 4.959741 7 80 80 80 80 2f 01 00
E: 5.087896 7 ff 80 80 80 2f 01 00
E: 5.119784 7 ff 80 80 80 0f 04 00
E: 5.247857 7 ff 80 80 80 1f 04 00
E: 5.279869 7 80 80 80 80 1f 00 00
E: 5.375893 7 00 80 80 80 1f 00 00
E: 5.407720 7 00 00 80 80 1f 00 00
E: 5.439856 7 00 00 80 80 0f 00 00
E: 5.471751 7 00 00 80 80 0f 04 00
E: 5.567854 7 80 80 80 80 0f 01 00
E: 5.695829 7 80 80 80 80 0f 05 00
E: 5.727776 7 ff 00 80 80 0f 05 00
E: 5.759829 7 ff 00 80 80 0f 04 00
E: 5.855773 7 80 80 80 80 0f 00 00
E: 5.951873 7 80 80 80 80 0f 80 00
E: 6.079842 7 80 80 80 80 0f c0 00
E: 6.143830 7 80 80 80 80 0f 40 00
E: 6.303839 7 80 80 80 80 0f 80 00
E: 6.463828 7 80 80 80 80 0f c0 00
E: 6.495797 7 80 80 80 80 0f 40 00
E: 6.655813 7 80 80 80 80 0f 80 00
E: 6.815859 7 80 80 80 80 0f c0 00
E: 6.847768 7 80 80 80 80 0f 40 00
E: 6.943821 7 80 80 80 80 0f 00 00
E: 7.007829 7 80 80 80 80 0f 01 00
E: 7.135864 7 ff 80 80 80 0f 01 00
E: 7.199819 7 ff 80 80 80 0f 00 00
E: 7.327850 7 80 80 80 80 8f 00 00
E: 7.487771 7 80 00 80 80 0f 00 00
E: 7.647689 7 80 80 80 80 2f 00 00
E: 7.839805 7 80 ff 80 80 0f 00 00
E: 7.999842 7 80 80 80 80 1f 00 00
E: 8.127833 7 00 80 80 80 1f 00 00
E: 8.159778 7 00 80 80 80 0f 00 00
E: 8.255796 7 80 80 80 80 0f 00 00
E: 8.319784 7 80 80 80 80 8f 00 00
E: 8.447838 7 80 00 80 80 8f 00 00
E: 8.479701 7 80 00 80 80 8f 04 00
E: 8.511764 7 80 00 80 80 0f 04 00
E: 8.607794 7 80 00 80 80 0f 05 00
E: 8.671768 7 80 80 80 80 2f 01 00
E: 8.735813 7 80 80 80 80 2f 09 00
E: 8.863685 7 ff 80 80 80 2f 09 00
E: 8.895661 7 ff 80 80 80 2f 0d 00
E: 8.927757 7 ff 80 80 80 0f 0d 00
E: 8.959757 7 ff 80 80 80 0f 04 00
E: 9.119782 7 80 80 80 80 0f 00 00
E: 9.151765 7 80 80 80 80 0f 80 00
E: 9.279824 7 80 00 80 80 0f 84 00
E: 9.311711 7 80 00 80 80 0f 04 00
E: 9.439797 7 80 00 80 80 0f 00 00
E: 9.471814 7 80 80 80 80 0f 00 00
E: 9.503780 7 80 80 80 80 af 09 00
E: 9.663689 7 80 00 80 80 8f 0d 00
E: 9.695709 7 80 00 80 80 0f 04 00
E: 9.791787 7 80 00 80 80 0f 05 00
E: 9.823789 7 80 80 80 80 0f 01 00
E: 9.855795 7 80 80 80 80 0f 09 00
E: 9.951773 7 80 80 80 80 0f 00 00
^C

Thanks. However, next time please attach the logs as an attachment, not inlined.

So this is weird. If I replay your logs on a 4.8.4-200.fc24, it seems to be working (at least the device appears and can emit events).

I can also state that the commit I was thinking doesn't interfere with this particular device.

So could you downgrade your kernel (to 4.7.5) on your F24 box and see if fails there? I suspect some udev script might be interfering.

Apparently my nvidia drivers are being a serious pain, and trying to boot into 4.7.5 causes my monitor to go out of range. What udev script(s) might I be looking for that could be causing issues here?

I tried removing all files from /etc/udev/rules.d and rebooting, didn't seem to help.

My Bluetooth dongle seems to be working now in Fedora 25 (more or less...) so I am able to connect the controller via Bluetooth. Connecting via USB still doesn't seem to work anymore, but I'm less concerned now that Bluetooth is working properly.

*********** MASS BUG UPDATE **************

We apologize for the inconvenience.  There are a large number of bugs to go through and several of them have gone stale.  Due to this, we are doing a mass bug update across all of the Fedora 24 kernel bugs.

Fedora 25 has now been rebased to 4.10.9-100.fc24.  Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel.

If you have moved on to Fedora 26, and are still experiencing this issue, please change the version to Fedora 26.

If you experience different issues, please open a new bug report for those.

*********** MASS BUG UPDATE **************
This bug is being closed with INSUFFICIENT_DATA as there has not been a response in 2 weeks. If you are still experiencing this issue, please reopen and attach the 
relevant data from the latest kernel you are running and any data that might have been requested previously.