[Dev] Chromebook C201 wifi

Lee Strobel leestrobel at disroot.org
Sun Mar 31 19:43:24 GMT 2019

lsusb for the Senao EUB9801 says its max power is 450mA, so only 50mA
less than the Atheros. However, I suspect those are just numbers
someone's typed in a text file somewhere. They might not actually be
drawing those currents.

It looks like a USB tester can be purchased online for $10. For that
money, I might just buy one and actually measure the current draw.

Btw, from what I saw on Wikipedia, it looks like a standard usb 2.0
port should be able to supply 500mA as standard.


On Sun, 2019-03-31 at 14:04 -0400, Lee Strobel wrote:
> Hi Denis,
> > For the record, the WiFi related bugreport is here:
> > https://labs.parabola.nu/issues/2261
> > 
> > Could you try to see if a USB HUB that is powered by its own power
> > supply makes it usable. If you don't have one you may know people
> > that
> > have one and borrow it just for doing a quick test.
> > 
> I will see what I can do. I can't think of anyone I know off-hand who
> would have an externally-powered USB hub, but I will ask around.
> About the power thing: I actually have an older USB wifi dongle, a
> 'Senao EUB9801', which seems to work great when plugged directly into
> the Chromebook (if I use the firmware blob). According to the kernel
> boot log, I think it is running on a Ralink chip of some kind. I will
> try to investigate, as you suggested, and see if it requires less
> power
> than the ThinkPenguin dongle. It is older (~8-10 years), so maybe it
> is
> using an older wifi technology that consumes less power?
> The reason I asked about the kernel devs is just because I was
> wondering if the team that maintains the module for the Atheros chip
> are aware of the issue. I would think we might need their assistance,
> if any of us wanted to try to modify the module.
> Lee
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