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morrownr / USB-WiFi

USB WiFi Adapter Information for Linux
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Issue CF-WU785 AC #183

Open userabcd0 opened 1 year ago

userabcd0 commented 1 year ago

Received this comfast device yesterday, it has the 7612u chipset.

When the wifi device is plugged in to a usb hub connected to a usb port on the pc, the pc is prevented from booting (cold boot) Remove the wifi adapter and the pc boot cycle continues and can then plug and use the wifi adapter.

Do not have this problem with cf953ax, pc boots normally with usb wifi connected via a usb hub, nor with any realtek wifi devices (even the multi state devices)

Anyone have the same or could suggest something for a fix when the cf-wu785ac is connected via a usb hub, it prevents the pc booting from a cold boot?

morrownr commented 1 year ago

@userabcd0

There is an issue in Linux kernels 6.1 and 6.2 rcx where adapters based on the mt7612u and mt7610u are broken. Seriously broken as in lock your system broken. A patch provided by Intel broke the drivers. A new patch by Mediatek fixes things but the fix is to the mac80211 driver which is part of the system stack so needs approval before it can be applied. Hopefully that happens very soon.

In the meantime, use kernels <= 6.0.

Nick

morrownr commented 1 year ago

@userabcd0

If you are using kernel 6.1 or greater and this is your problem, I can point you to the patch if you want.

userabcd0 commented 1 year ago

Thanks a lot for that explanation.

I am on kernel 6.1.

I will first try downgrade the kernel to 5.15 and give that a try, if that does not work then I will ask for the patch.

Thanks for your help.

morrownr commented 1 year ago

@userabcd0

When the wifi device is plugged in to a usb hub connected to a usb port on the pc, the pc is prevented from booting (cold boot) Remove the wifi adapter and the pc boot cycle continues and can then plug and use the wifi adapter.

I did not real close enough the first time. The problem I wrote about above would happen the same if plugged into a hub or directly into a port on the PC.

Is the hub a powered hub?

morrownr commented 1 year ago

I will first try downgrade the kernel to 5.15 and give that a try, if that does not work then I will ask for the patch.

Well, maybe I misread the 2nd time. Long day.

One way or another, the mt7612u and mt7610u chipsets are not working with kernels greater than 6.0 so testing with 5.15 is good idea.

I really hope the patch goes in soon. Right now we see a trickle of users reporting problems in the various distro forums but it is going to turn into a tidal wave as more distros move to the new LTS (6.1).

morrownr commented 1 year ago

FYI: I have a CF-951AX. The problem does not bother the mt7921au chipset. Of course, this chipset is not yet supported in the 5.15 kernel so what we need for distros like Ubuntu, is for them to release a HWE 5.19 kernel and all would be good... until we decide to play with the latest toy...

userabcd0 commented 1 year ago

@userabcd0

When the wifi device is plugged in to a usb hub connected to a usb port on the pc, the pc is prevented from booting (cold boot) Remove the wifi adapter and the pc boot cycle continues and can then plug and use the wifi adapter.

I did not real close enough the first time. The problem I wrote about above would happen the same if plugged into a hub or directly into a port on the PC.

Is the hub a powered hub?

The hub has a power point on it but I have not connected the power supply.

When I connect the CF-WU785AC wifi device directly to the USB port 2 or 3 on the PC, it boots no problems in windows and linux and with kernel 5.15 and 6.1. The problem is the Comfast device is huge and it takes 2 usb ports on the PC.

When I connect the CF785AC via the usb hub the boot gets stuck, cannot enter BIOS as it seems to be stuck before that. When the boot is stuck and I just remove the wifi dongle, then the boot proceeds and I can enter the BIOS, replug the wifi dongle and it is working.

Strangely, I just bought a vention USB C hub, I connect the CF785 wifi dongle to the vention hub and plug the vention hub into my original usb hub giving boot problems and all is now booting correctly.

I think for me the matter is solved with the device connected via the vention hub connected to my usb hub.

userabcd0 commented 1 year ago

FYI: I have a CF-951AX. The problem does not bother the mt7921au chipset. Of course, this chipset is not yet supported in the 5.15 kernel so what we need for distros like Ubuntu, is for them to release a HWE 5.19 kernel and all would be good... until we decide to play with the latest toy...

I also have a 953AX (7921AU) and this device is giving no boot problems, it works on all usb hubs in linux on kernels 5.19 and 6.1.

morrownr commented 1 year ago

See #186