[Bug 207219] [BISECTED] Sony Vaio laptop built-in ricoh webcam no longer found on Fedora 31 with 5.4.11 kernel

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207219

--- Comment #17 from William Bader (williambader@hotmail.com) ---
Created attachment 288863
  --> https://bugzilla.kernel.org/attachment.cgi?id=288863&action=edit
usbmon logs

>To start with, before ehci-pci.ko was loaded there should have been no
>usbmon/3u or usbmon/4u files

I might have transcribed the lines in the wrong order. The mouse wasn't
working, so I had to type into a text console and I couldn't copy and paste to
another window.

>your usbmon3 trace shows the webcam working after it was initialized using the
>old scheme!

I know. I am pretty sure that I did a cold boot, and that I tested for
/dev/video* after booting.
Since I reported the problem, I have continued using the official Fedora
kernels for day-to-day work, and I use the test kernels only for short periods
for testing.
I have been checking the webcam every day out of curiosity when I boot my
laptop in the morning, and maybe 1 out of 10 times the old scheme works.

In any case, I just did the procedure again, taking better care.

cold boot from kernel 5.6.6.localversion14

no /dev/video
ls: cannot access '/dev/vid*': No such file or directory

lsusb
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

sudo ls -l /sys/kernel/debug/usb/usbmon
total 0
-rw------- 1 root root 0 May  1 00:03 0s
-rw------- 1 root root 0 May  1 00:03 0u
-rw------- 1 root root 0 May  1 00:03 1s
-rw------- 1 root root 0 May  1 00:03 1t
-rw------- 1 root root 0 May  1 00:03 1u
-rw------- 1 root root 0 May  1 00:03 2s
-rw------- 1 root root 0 May  1 00:03 2t
-rw------- 1 root root 0 May  1 00:03 2u

restore ehci-pci.ko

lsusb unchanged with only 2 devices

insmod /lib/modules/$(uname -r)/kernel/drivers/usb/host/ehci-pci.ko
cat /sys/kernel/debug/usb/usbmon/3u > usbmon3.txt &
cat /sys/kernel/debug/usb/usbmon/4u > usbmon4.txt &

no /dev/video

lsusb
Bus 004 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 004 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 004: ID 05ca:18c0 Ricoh Co., Ltd
Bus 003 Device 005: ID 0489:e036 Foxconn / Hon Hai
Bus 003 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

echo 0 >/sys/bus/usb/devices/3-1/bConfigurationValue
echo 1 >/sys/bus/usb/devices/3-1/bConfigurationValue
no /dev/video*

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