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I've got a USB switch that I use to switch my keyboard/mouse/yubikey between my Arch Linux desktop and macOS laptop. It works great, but I'm a bit unhappy with how long Linux takes to enumerate and initialize the keyboard when switching from the laptop to the desktop (macOS -> Linux). When I switch to my laptop, macOS initializes the keyboard in under half a second, but when switching to my desktop, Linux takes over 2.5 seconds until the keyboard is usable which feels sluggish. My desktop is significantly more powerful and has a higher clock speed than the laptop, so I don't think this is arising from hardware limitations. It may seem a bit picky to be worried about this, but I switch back and forth many dozens of times per day and the delay bothers me.
For reference, the USB switch has 4 devices connected:
|__ USB Switch
|__ Keyboard Built-in Hub
|__ Yubikey
|__ Keyboard
|__ Teensyduino (Used to trigger the USB switch)
|__ Wireless mouse dongleI've tried unplugging all other devices from the switch and that speeds things up slightly, but it's still slower than macOS is with all peripherals still attached.
I am curious to know if there's anything I can do to speed things up. Can I perhaps write a udev rule to prioritize the keyboard when enumerating the new USB devices? I don't care how long the other devices take to connect, only the keyboard.
Here's dmesg during a connection, with the moment the keyboard becomes usable noted:
<-- USB switch triggered (connect to this computer)
[1303544.724556] usb 1-2.1: new high-speed USB device number 89 using xhci_hcd
[1303544.862489] usb 1-2.1: New USB device found, idVendor=14cd, idProduct=8601, bcdDevice= 0.00
[1303544.862494] usb 1-2.1: New USB device strings: Mfr=1, Product=3, SerialNumber=0
[1303544.862496] usb 1-2.1: Product: USB 2.0 Hub
[1303544.862497] usb 1-2.1: Manufacturer: USB Device
[1303544.867532] hub 1-2.1:1.0: USB hub found
[1303544.870490] hub 1-2.1:1.0: 4 ports detected
[1303545.214374] usb 1-2.1.1: new high-speed USB device number 90 using xhci_hcd
[1303545.357530] usb 1-2.1.1: New USB device found, idVendor=2109, idProduct=2812, bcdDevice= d.a0
[1303545.357536] usb 1-2.1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1303545.357538] usb 1-2.1.1: Product: USB2.0 Hub
[1303545.357540] usb 1-2.1.1: Manufacturer: VIA Labs, Inc.
[1303545.362777] hub 1-2.1.1:1.0: USB hub found
[1303545.365541] hub 1-2.1.1:1.0: 4 ports detected
[1303545.484391] usb 1-2.1.3: new full-speed USB device number 91 using xhci_hcd
[1303545.824373] usb 1-2.1.1.1: new full-speed USB device number 92 using xhci_hcd
[1303545.869575] usb 1-2.1.3: New USB device found, idVendor=046d, idProduct=c52b, bcdDevice=12.11
[1303545.869581] usb 1-2.1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1303545.869583] usb 1-2.1.3: Product: USB Receiver
[1303545.869584] usb 1-2.1.3: Manufacturer: Logitech
[1303546.000078] logitech-djreceiver 0003:046D:C52B.045A: hiddev96,hidraw0: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:01:00.0-2.1.3/input2
[1303546.212992] logitech-hidpp-device 0003:046D:4069.045B: HID++ 4.5 device connected.
[1303546.304362] usb 1-2.1.4: new full-speed USB device number 93 using xhci_hcd
[1303546.309612] usb 1-2.1.1.1: New USB device found, idVendor=[...], idProduct=[...], bcdDevice= [...]
[1303546.309620] usb 1-2.1.1.1: New USB device strings: Mfr=[...], Product=[...], SerialNumber=[...]
[1303546.309623] usb 1-2.1.1.1: Product: Yubikey [...]
[1303546.309625] usb 1-2.1.1.1: Manufacturer: Yubico
[1303546.368283] input: Yubico Yubikey [...]
[1303546.444734] hid-generic [...]: input,hidraw1: USB HID [...] Keyboard [Yubico Yubikey [...]] on usb-[...]
[1303546.454840] hid-generic [...]: hiddev97,hidraw2: USB HID [...] Device [Yubico Yubikey [...]] on usb-[...]
[1303546.576792] usb 1-2.1.4: New USB device found, idVendor=16c0, idProduct=0486, bcdDevice= 2.00
[1303546.576800] usb 1-2.1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[1303546.576802] usb 1-2.1.4: Product: Teensyduino RawHID
[1303546.576804] usb 1-2.1.4: Manufacturer: Teensyduino
[1303546.576806] usb 1-2.1.4: SerialNumber: 4755050
[1303546.610999] hid-generic 0003:16C0:0486.045E: hiddev98,hidraw3: USB HID v1.11 Device [Teensyduino Teensyduino RawHID] on usb-0000:01:00.0-2.1.4/input0
[1303546.626808] hid-generic 0003:16C0:0486.045F: hidraw4: USB HID v1.11 Device [Teensyduino Teensyduino RawHID] on usb-0000:01:00.0-2.1.4/input1
[1303546.734339] usb 1-2.1.1.4: new full-speed USB device number 94 using xhci_hcd
[1303547.031869] usb 1-2.1.1.4: New USB device found, idVendor=24f0, idProduct=0140, bcdDevice= 1.00
[1303547.031875] usb 1-2.1.1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[1303547.031876] usb 1-2.1.1.4: Product: Das Keyboard
[1303547.031878] usb 1-2.1.1.4: Manufacturer: Metadot - Das Keyboard
[1303547.078877] input: Metadot - Das Keyboard Das Keyboard as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/usb1/1-2/1-2.1/1-2.1.1/1-2.1.1.4/1-2.1.1.4:1.0/0003:24F0:0140.0460/input/input596
[1303547.154659] hid-generic 0003:24F0:0140.0460: input,hidraw5: USB HID v1.10 Keyboard [Metadot - Das Keyboard Das Keyboard] on usb-0000:01:00.0-2.1.1.4/input0
[1303547.207863] input: Metadot - Das Keyboard Das Keyboard System Control as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/usb1/1-2/1-2.1/1-2.1.1/1-2.1.1.4/1-2.1.1.4:1.1/0003:24F0:0140.0461/input/input597
[1303547.284465] input: Metadot - Das Keyboard Das Keyboard Consumer Control as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/usb1/1-2/1-2.1/1-2.1.1/1-2.1.1.4/1-2.1.1.4:1.1/0003:24F0:0140.0461/input/input598
[1303547.284556] hid-generic 0003:24F0:0140.0461: input,hidraw6: USB HID v1.10 Device [Metadot - Das Keyboard Das Keyboard] on usb-0000:01:00.0-2.1.1.4/input1
<-- Keyboard becomes usable (t = 2.56s)
[1303547.541271] input: Logitech MX Master 2S as /devices/pci0000:00/0000:00:01.1/0000:01:00.0/usb1/1-2/1-2.1/1-2.1.3/1-2.1.3:1.2/0003:046D:C52B.045A/0003:046D:4069.045B/input/input599
[1303547.541570] logitech-hidpp-device 0003:046D:4069.045B: input,hidraw7: USB HID v1.11 Keyboard [Logitech MX Master 2S] on usb-0000:01:00.0-2.1.3/input2:1$ uname -srm
Linux 5.12.15-1-ck-zen x86_64I use Sway, but I don't think that's where the bottleneck is because I've tested from a TTY and get similar results.
Last edited by MaddyBoo (2021-07-24 08:30:50)
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