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On 08/10/17 16:20, Andrew Savchenko wrote: |
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> Hi, |
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> |
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> On Fri, 6 Oct 2017 08:31:27 +0800 Bill Kenworthy wrote: |
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>> Hi all, I have a laptop keyboard problem - it fails to reconnect the |
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>> keyboard on opening after closing. |
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>> |
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>> MS Surface pro 4 with type keyboard. |
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>> |
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>> The keyboard connects correctly on bootup or resume from hibernate (when |
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>> open). |
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>> |
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>> Close keyboard (removes power), open keyboard and it no longer works. |
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>> Requires a reboot (or hibernate/resume) for it it to work again. |
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>> |
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>> On opening the keyboard, the kernel detects it, it shows up in lsusb. |
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>> |
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>> Oct 6 05:57:15 bunyip kernel: usb 1-7: Product: Surface Type Cover |
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>> Oct 6 05:57:15 bunyip kernel: input: Microsoft Surface Type Cover |
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>> Keyboard as |
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>> /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/0003:045E:07E8.0003/input/input29 |
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>> Oct 6 05:57:15 bunyip kernel: input: Microsoft Surface Type Cover |
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>> Consumer Control as |
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>> /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/0003:045E:07E8.0003/input/input31 |
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>> Oct 6 05:57:15 bunyip kernel: input: Microsoft Surface Type Cover |
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>> Touchpad as |
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>> /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/0003:045E:07E8.0003/input/input33 |
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>> Oct 6 05:57:15 bunyip kernel: hid-multitouch 0003:045E:07E8.0003: |
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>> input,hiddev96,hidraw0: USB HID v1.11 Keyboard [Microsoft Surface Type |
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>> Cover] on usb-0000:00:14.0-7/input0 |
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>> |
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>> It looks like it changes input when reopening but the event framework |
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>> fails to re-enumerate it. |
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>> |
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>> Ive tried restarting udev but no luck. |
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> |
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> Try to update your kernel to the latest one, preferably to vanilla |
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> one. |
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> |
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> Also try udevadm trigger. |
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> |
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> Best regards, |
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> Andrew Savchenko |
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> |
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|
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Thanks Andrew, it used to work on older kernels - something 4.9 and before. |
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The culprit turns out to to be the i2c-hid kernel module - removing and |
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modprobing it again fixes the problem. Its probably a bug as the |
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keyboard is usb-hid so I don't know why i2c-hid is involved. A udev |
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rule triggered when the keyboard opens takes care of it for now. |
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|
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BillK |
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