Bug#980450: Bug 980450: Module ohci-hcd does not detect USB 1.1 devices
Control: found 980450 4.19.160-2
Hello folks,
Having read the original thread in french and helped another user with
the same issue, I would like to add some clarifications.
The bug submitter has the following hardware :
00:03.0 USB controller [0c03]: Silicon Integrated Systems [SiS] USB 1.1
Controller [1039:7001] (rev 0f) (prog-if 10 [OHCI])
Subsystem: ASUSTeK Computer Inc. USB 1.1 Controller [1043:1977]
Kernel driver in use: ohci-pci
The issue could not be reproduced with Nvidia USB 1.1 OHCI controllers.
The bug submitter found two different workarounds :
1) unloading and reloading the ohci-pci module
2) loading the ohci-hcd module with distrust_firmware=0
Here is another thread (also in french) discussing the issue :
<https://www.debian-fr.org/t/noyau-4-19-0-13-perte-de-la-souris-usb/83750>
with the following hardware :
00:1c.0 USB controller [0c03]: ULi Electronics Inc. USB 1.1 Controller
[10b9:5237] (rev 03)
Subsystem: Acer Incorporated [ALI] USB 1.1 Controller [1025:0085]
Kernel driver in use: ohci-pci
The issue is the same: when booting with linux-image-4.19.0-13-amd64
(4.19.160-2), USB 1.1 devices are not detected in the kernel logs. When
booting with previous kernels, USB 1.1 devices are detected as expected.
USB 2.0 devices do not seem to be affected. Workaround #2 worked.
Workaround #1 was not tried.
The issue is likely to be caused by the following change backported from
kernel 5.10:
usb: ohci: Default to per-port over-current protection
Interestingly, another patch from the same author was included into
kernel 5.10 at the same time but not backported in longterm series 4.9
and 4.19, and does the same as workaround #2 :
usb: ohci: Make distrust_firmware param default to false
<https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/drivers/usb/host/ohci-hcd.c?h=v5.10>
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