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bug#35574: bcm5974 touchpad is not recognized as touchpad
From: |
pelzflorian (Florian Pelz) |
Subject: |
bug#35574: bcm5974 touchpad is not recognized as touchpad |
Date: |
Fri, 17 Jan 2020 00:35:37 +0100 |
Now that I know wisdomlight has the issue too on their Macbook Air
<https://lists.gnu.org/archive/html/help-guix/2020-01/msg00105.html> I
investigated further.
>From the Linux kernel docs
<https://www.kernel.org/doc/html/latest/input/devices/bcm5974.html>:
> 5.2. USB Race
>
> The Apple multi-touch trackpads report both mouse and keyboard events
> via different interfaces of the same usb device. This creates a race
> condition with the HID driver, which, if not told otherwise, will find
> the standard HID mouse and keyboard, and claim the whole device. To
> remedy, the usb product id must be listed in the mouse_ignore list of
> the hid driver.
Indeed for me on good boots, the command `lsusb -t` prints
|__ Port 3: Dev 2, If 2, Class=Human Interface Device, Driver=bcm5974, 12M
while on bad boots it says Driver=usbmouse.
But why that happens I do not know, because the mouse_ignore list in
the Linux-libre kernel’s drivers/hid/hid-quirks.c file does list my
touchpad. Strange. I will investigate further if a change to the
kernel config could help.
Regards,
Florian
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