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From: Carlo Caione <carlo@endlessm.com>
Date: Thu, 18 Jan 2018 10:43:23 +0000
Message-ID: <CAL9uMOFDtBORCY3FO_nnUg1fpdio2FfHgfoUN4z3svSoQoT5VA@mail.gmail.com> (sfid-20180118_114330_928976_AAB35AC7)
Subject: Re: RTL8723bu: poor signal and connection troubles
To: Jes Sorensen <Jes.Sorensen@gmail.com>
Cc: kvalo@codeaurora.org, linux-wireless@vger.kernel.org,
        mylene.josserand@free-electrons.com,
        Linux Upstreaming Team <linux@endlessm.com>,
        briselec@gmail.com, Larry.Finger@lwfinger.net
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Sender: linux-wireless-owner@vger.kernel.org

On Wed, Jan 10, 2018 at 12:15 PM, Carlo Caione <carlo@endlessm.com> wrote:
> Hi,
> this is a follow up email to [0] since the problem was never fully
> investigated / solved and I keep seeing the same problem also on my
> hardware.
>
> Also in my case the hardware is a rtl8723bt transceiver
> (0x0bda:0xb720), this time shipped on the internal USB bus in a cheap
> laptop branded Zyrex Sky 232.
>
> As already reported by Mylene the problem is that using this
> transceiver and the latest Linus master you can barely see any WiFi
> network around and also when a WiFi network is actually seen, the
> connection is impossible since the signal strength is too low to have
> a reliable connection. Of course during my tests BT is off and no BT
> driver is probed at all.
>
> Using the downstream driver at [1] everything works correctly.
>
> I tried to debug a bit the issue, in particular comparing functions
> and registers related to the antenna setup (.power_on, .enable_rf,
> .phy_init_antenna_selection, .phy_iq_calibrate hooks) but everything
> seems pretty much the same on the two drivers (even though slightly
> differences do exist).
>
> Any idea / suggestion on how to debug this problem? I guess it's worth
> to start looking at this since several platforms are being affected
> now.

Jes,
anything to comment about this issue? (ping)

-- 
Carlo Caione  |  +44.7384.69.16.04  |  Endless