Re: Webcams not recognized on a Dell Latitude 5285 laptop

Re: Webcams not recognized on a Dell Latitude 5285 laptop

[Andy Shevchenko]

On Sun, Mar 11, 2018 at 2:38 PM, FRÉDÉRIC PARRENIN
<frederic.parrenin@univ-grenoble-alpes.fr> wrote:
> Dear Oliver and all,
>
> So I was expecting linux-4.16 to recognize my webcams, thanks to this new PCI driver Oliver mentioned.
> Therefore I installed 4.16-rc4.
> Unfortunately, there is still no /dev/video* device
>
> Any idea what could be done to have these webcams working?

I guess you need a driver.
Cc: + Sakari, and thus leaving the complete message uncut.

>
> Thanks,
>
> Frederic
>
>
>> De: "FRÉDÉRIC PARRENIN" <frederic.parrenin@univ-grenoble-alpes.fr>
>> À: "Oliver Neukum" <oneukum@suse.com>
>> Cc: "linux-usb" <linux-usb@vger.kernel.org>
>> Envoyé: Lundi 11 Décembre 2017 16:39:41
>> Objet: Re: Webcams not recognized on a Dell Latitude 5285 laptop
>
>> > > > it looks like you need the experimental driver posted here
>
>> > > > https://www.spinics.net/lists/linux-media/msg123268.html
>
>> > > Thanks for the information.
>> >> So, if I understand correctly, this driver will not be included in 4.15, will
>> > > it?
>> > > Any idea when this will be included in a release?
>
>> > I have no idea. Could you contact the original developers?
>> > The answer is interesting, but I have no idea.
>
>> It seems it will be included in the 4.16 release:
>
>> https://www.mail-archive.com/linux-media@vger.kernel.org/msg122619.html
>
>> Probably just a bit too late for 4.15.
>
>> Frederic
>
> !!! WARNING!!! New email address: frederic.parrenin@univ-grenoble-alpes.fr
> http://pp.ige-grenoble.fr/pageperso/parrenif/index.html
>
> ----- Mail original -----
>> De: "FRÉDÉRIC PARRENIN" <frederic.parrenin@univ-grenoble-alpes.fr>
>> À: "Oliver Neukum" <oneukum@suse.com>
>> Cc: "linux-usb" <linux-usb@vger.kernel.org>
>> Envoyé: Lundi 11 Décembre 2017 16:39:41
>> Objet: Re: Webcams not recognized on a Dell Latitude 5285 laptop
>
>> > > > it looks like you need the experimental driver posted here
>
>> > > > https://www.spinics.net/lists/linux-media/msg123268.html
>
>> > > Thanks for the information.
>> >> So, if I understand correctly, this driver will not be included in 4.15, will
>> > > it?
>> > > Any idea when this will be included in a release?
>
>> > I have no idea. Could you contact the original developers?
>> > The answer is interesting, but I have no idea.
>
>> It seems it will be included in the 4.16 release:
>
>> https://www.mail-archive.com/linux-media@vger.kernel.org/msg122619.html
>
>> Probably just a bit too late for 4.15.
>
>> Frederic
> --
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-- 
With Best Regards,
Andy Shevchenko

Re: Webcams not recognized on a Dell Latitude 5285 laptop

[Sakari Ailus]

Hi Andy and Frédéric,

On Tue, Mar 13, 2018 at 06:11:00PM +0200, Andy Shevchenko wrote:
> On Sun, Mar 11, 2018 at 2:38 PM, FRÉDÉRIC PARRENIN
> <frederic.parrenin@univ-grenoble-alpes.fr> wrote:
> > Dear Oliver and all,
> >
> > So I was expecting linux-4.16 to recognize my webcams, thanks to this new PCI driver Oliver mentioned.
> > Therefore I installed 4.16-rc4.
> > Unfortunately, there is still no /dev/video* device
> >
> > Any idea what could be done to have these webcams working?
> 
> I guess you need a driver.
> Cc: + Sakari, and thus leaving the complete message uncut.

Or drivers. And a bit more than that actually. Assuming this is IPU3, that
is. If that's the case, the short answer is there's no trivial way to
support webcam-like functionality using this device. The ACPI tables would
tell more details.

Could you send me the ACPI tables, i.e. the file produced by the command:

	acpidump -o acpidump.bin

In Debian acpidump is included in acpica-tools package.

Thank you.

-- 
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com

Re: Webcams not recognized on a Dell Latitude 5285 laptop

[Frédéric Parrenin]

Dear Sakari et al.,

The acpi tables are apparently too big for the mailing lists.
So I put the file here:
https://mycore.core-cloud.net/index.php/s/DwTOb8TJJZYJtNe

Any information on what is going on with the webcams will be appreciated.

Thanks,

Frédéric

> 
> Or drivers. And a bit more than that actually. Assuming this is IPU3, that
> is. If that's the case, the short answer is there's no trivial way to
> support webcam-like functionality using this device. The ACPI tables would
> tell more details.
> 
> Could you send me the ACPI tables, i.e. the file produced by the command:
> 
> 	acpidump -o acpidump.bin
> 
> In Debian acpidump is included in acpica-tools package.
> 
> Thank you.
> 

Re: Webcams not recognized on a Dell Latitude 5285 laptop

[Nicolas Dufresne]

This laptop embeds one of these new "complex" cameras from Intel. They
requires IPU3 driver. Though, unlike traditional webcam, you need
special userspace to use it (there is no embedded firmware to manage
focus, whitebalance, etc, userspace code need to read the stats and
manage that). As of now, there is no good plan on how to support this
in userspace.

I have seen a lot of Intel engineer speak about GStreamer element
icamsrc, which would support this camera, but haven't seen any public
source code, so I can only assume it's all closed source. It's also of
limited use considering that browsers don't use GStreamer.

If I was to propose a plan, this should be integrated into Pipewire
daemon, which is upcoming userspace daemon to multi-plex notably
cameras across multiple process (a bit like pulseaudio for audio). It's
also the foreseen solution for sandboxed application that cannot
directly access any of the /dev, hence reserve forever a sesrouce like
a camera.

On Linux Desktop, this is a very bad launch, it will likely takes some
times before your camera works out of the box (if ever).

Nicolas

Le dimanche 01 avril 2018 à 18:17 +0200, Frédéric Parrenin a écrit :
> Dear Sakari et al.,
> 
> The acpi tables are apparently too big for the mailing lists.
> So I put the file here:
> https://mycore.core-cloud.net/index.php/s/DwTOb8TJJZYJtNe
> 
> Any information on what is going on with the webcams will be
> appreciated.
> 
> Thanks,
> 
> Frédéric
> 
> > 
> > Or drivers. And a bit more than that actually. Assuming this is
> > IPU3, that
> > is. If that's the case, the short answer is there's no trivial way
> > to
> > support webcam-like functionality using this device. The ACPI
> > tables would
> > tell more details.
> > 
> > Could you send me the ACPI tables, i.e. the file produced by the
> > command:
> > 
> > 	acpidump -o acpidump.bin
> > 
> > In Debian acpidump is included in acpica-tools package.
> > 
> > Thank you.
> > 

Re: Webcams not recognized on a Dell Latitude 5285 laptop

[Sakari Ailus]

Hi Frédéric,

On Thu, Mar 29, 2018 at 09:53:45AM +0200, FRÉDÉRIC PARRENIN wrote:
> The second part now. 

I looked at the tables and it seems the dsdt lists two sensors (imx135 and
ov2740) but the rest of the information on how they're connected etc. is
missing. There are no sensor drivers in upstream kernel either.

So there would be some work to do before you could capture raw bayer images
from these devices.

-- 
Kind regards,

Sakari Ailus
sakari.ailus@linux.intel.com