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SubjectRe: Strange regression in hid_llogitech_dj (was: Re: Linux 5.2-rc4)
On Tue, 11 Jun 2019, Rafael J. Wysocki wrote:

> I noticed that the cordless mouse used by me with one of the machines here
> stopped to work in 5.2-rc (up to and including the -rc4).
> Bisection turned up commit 74808f9115ce ("HID: logitech-dj: add support for non
> unifying receivers").
> Of course, that commit does not revert cleanly from 5.2-rc4, but I have reverted
> the changes made by it in hid/hid-ids.h and I took the version of hid/hid-logitech-dj.c
> from commit b6aeeddef68d ("HID: logitech-dj: add logi_dj_recv_queue_unknown_work
> helper"), which is the parent of commit 74808f9115ce, and that made the mouse
> work again for me.
> Here's the output of "dmesg | grep -i logitech" from 5.2-rc4 with the above changes:
> [ 4.288905] usb 1-2: Manufacturer: Logitech
> [ 5.444621] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:046D:C52F.0002/input/input23
> [ 5.446960] hid-generic 0003:046D:C52F.0002: input,hidraw1: USB HID v1.11 Mouse [Logitech USB Receiver] on usb-0000:00:14.0-2/input0
> [ 5.451265] input: Logitech USB Receiver Consumer Control as /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.1/0003:046D:C52F.0003/input/input24
> [ 5.507545] hid-generic 0003:046D:C52F.0003: input,hiddev96,hidraw2: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:14.0-2/input1

Hi Rafael,

0x046d/0xc52f is known to have issues in 5.2-rcX. There is a patch queued
[1] that is believed to fix all this; my plan is to send it to Linus in
the coming 1-2 days. If you could report whether it fixes the issues
you've been seeing yourself as well, it'd be helpful.



Jiri Kosina

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