Bug#1071903: hw-detect: USB wireless adapter r8712u needs physical disconnect and reconnect for firmware to work

[Roland Clobus <rclobus@rclobus.nl>]

On 30/05/2024 00:55, Pascal Hambourg wrote:
> On 26/05/2024 at 22:29, Roland Clobus wrote:
> > Your patch series works fine, the firmware is correctly identified and 
> > loaded. Unfortunately for me, it still needs a reconnect cycle.
> > See the attached syslog for their effect. (I've used sid)
>
> Thank you for testing my patches but I did not expect them to solve the 
> reattachment issue, only to identify the right module.
>
> After the r8712u module is first loaded without the firmware then 
> unloaded and reloaded, what is the output of
>
> ls -d /sys/bus/usb/drivers/r8712u/1-3*
> ls -d /sys/bus/usb/devices/1-3/1-3*
>
> assuming the wireless adapter is identified as 1-3 ?

I've used the following to reproduce:
* A live-build-based image with the Debian installer, generated for sid
  with in config/packages the hw-detect.udeb with the patches from #1033679
* Virtual-Manager boots the ISO image (UEFI secure boot)
* When the GRUB menu is shown, I attach the USB network adapter from the 
host
* I select the Debian installer

* Moment 1: the first d-i screen is shown. The USB device is seen by the 
kernel, but the module is not yet loaded
ls -d /sys/bus/usb/drivers/r8712u/1-3*
No such file or directory
ls -d /sys/bus/usb/drivers/usb/1-3*
/sys/bus/usb/drivers/usb/1-3
ls -d /sys/bus/usb/devices/1-3/1-3*
/sys/bus/usb/devices/1-3/1-3:1:0
lsmod | grep r8712u
<empty>

* Moment 2: the d-i screen 'No Ethernet card was detected' is shown
(The firmware has been placed where it can be found, module r8712u has 
been removed and added)
ls -d /sys/bus/usb/drivers/r8712u/1-3*
No such file or directory
ls -d /sys/bus/usb/drivers/usb/1-3*
No such file or directory
ls -d /sys/bus/usb/devices/1-3/1-3*
No such file or directory
lsmod | grep r8712u
r8712u     262144   0
cfg80211  1355776  1 r8712u
usbcore    409600  5 xhci_hcd,usbhib,r8712u,usb_storage,xhci_pci

* Moment 3: I disconnect and reconnect the USB device in virt-manager 
and select 'Detect network hardware' from the d-i menu. d-i shows a list 
of SSIDs
ls -d /sys/bus/usb/drivers/r8712u/1-3*
/sys/bus/usb/drivers/r8712u/1-3:1.0
ls -d /sys/bus/usb/drivers/usb/1-3*
/sys/bus/usb/drivers/usb/1-3
ls -d /sys/bus/usb/devices/1-3/1-3*
/sys/bus/usb/devices/1-3/1-3:1:0
lsmod | grep r8712u
r8712u     262144   0
cfg80211  1355776  1 r8712u
usbcore    409600  5 xhci_hcd,usbhib,r8712u,usb_storage,xhci_pci

With kind regards,
Roland Clobus

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