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From:   "Grumbach, Emmanuel" <emmanuel.grumbach@intel.com>
To:     Bjorn Helgaas <helgaas@kernel.org>,
        "bjorn@helgaas.com" <bjorn@helgaas.com>
CC:     "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
        "Mertarg10@gmail.com" <Mertarg10@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: Fwd: [Bug 201647] New: Intel Wireless card 3165 does not get
 detected but bluetooth works
Thread-Topic: Fwd: [Bug 201647] New: Intel Wireless card 3165 does not get
 detected but bluetooth works
Thread-Index: AQHUh2ApCc7lmNGfg0mZ5cTxRsuvBaVrCVdw
Date:   Sun, 2 Dec 2018 06:57:35 +0000
Message-ID: <0BA3FCBA62E2DC44AF3030971E174FB3013373E4A3@HASMSX112.ger.corp.intel.com>
References: <bug-201647-193951@https.bugzilla.kernel.org/>
 <CABhMZUXc4FS-f52ZDsErEhbkm_jjEz+kn75YO5Tuvp42Qm+1xw@mail.gmail.com>
 <20181128211959.GB178809@google.com>
In-Reply-To: <20181128211959.GB178809@google.com>
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> 
> [+cc Emmanuel, LKML]
> 
> On Fri, Nov 09, 2018 at 03:43:06PM -0600, Bjorn Helgaas wrote:
> > ---------- Forwarded message ---------
> > From: <bugzilla-daemon@bugzilla.kernel.org>
> > Date: Fri, Nov 9, 2018 at 4:10 AM
> > Subject: [Bug 201647] New: Intel Wireless card 3165 does not get
> > detected but bluetooth works
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=201647
> >
> >             Bug ID: 201647
> >            Summary: Intel Wireless card 3165 does not get detected but
> >                     bluetooth works
> >            Product: Drivers
> >            Version: 2.5
> >     Kernel Version: 4.19.1
> >           Hardware: Intel
> >                 OS: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: high
> >           Priority: P1
> >          Component: PCI
> >           Assignee: drivers_pci@kernel-bugs.osdl.org
> >           Reporter: Mertarg10@gmail.com
> >         Regression: No
> >
> > This bug affects most of the devices with a Celeron N4000 and an Intel
> > wifi 3165 Ac adapter.
> >
> > When using Linux wifi is not working however, Bluetooth is working
> > fine.  Also, Bluetooth part of this chip is connected via btusb and
> > the wifi part of this chip is connected via PCIe.
> 
> Can you attach a screenshot of the Windows 10 device manager info for the
> wifi adapter to the bugzilla?  If you can get a raw hex dump of its config
> space, that would be awesome.
> 
> Also attach a copy of your kernel .config file (typically in /boot/).
> 
> My only guess is that maybe the system keeps wifi completely powered
> down and uses hotplug to add it when needed.  [1] mentions wifi being on
> pcibus 1 under Windows.  Your lspci does show bridge 00:13.0 leading to bus
> 01, but Linux doesn't find any devices on bus 01.
> 
> Hotplug could be done via either acpiphp (ACPI mediated hotplug) or pciehp
> (native PCIe hotplug).  Your dmesg shows you do have acpiphp.
> 
> I can't tell about pciehp (your .config will show that), but I think pciehp will
> only claim bridges where SltCap contains HotPlug+, and yours shows HotPlug-
> , so I don't think pciehp will do anything on your system.
> 
> Even if the system does use hotplug, I don't know what mechanism the OS
> would use to wake up the device, since we don't know it even exists.  I guess
> there could be some magic switch accessible via USB.
> But if that were the case, I'm sure Emmanuel would know about it.
> 

Hm... Don't be so sure... :)
I don't think we have anything as fancy as this.
I guess you can try to dig into the BIOS settings?
I have heard of such a switch that would make the device disappear.