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Date:      Sat, 21 Feb 2015 17:59:48 -0500
From:      Shawn Webb <shawn.webb@hardenedbsd.org>
To:        Hans Petter Selasky <hps@selasky.org>
Cc:        freebsd-current@freebsd.org
Subject:   Re: Pluggable frame buffer devices
Message-ID:  <4020865.FJlWBPXrRZ@shawnwebb-laptop>
In-Reply-To: <54E6F060.2010301@selasky.org>
References:  <54E11A57.3030105@selasky.org> <1963872.pLReSBKNjx@shawnwebb-laptop> <54E6F060.2010301@selasky.org>

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On Friday, February 20, 2015 09:29:20 AM Hans Petter Selasky wrote:
> On 02/20/15 02:15, Shawn Webb wrote:
> > On Thursday, February 19, 2015 07:04:50 PM Shawn Webb wrote:
> >> On Sunday, February 15, 2015 11:14:47 PM Hans Petter Selasky wrote=
:
> >>> Hi,
> >>>=20
> >>> I've added support for USB display link adapters to FreeBSD-11-cu=
rrent,
> >>> but the kernel panics once "vt_fb_attach(info)" is called from
> >>> "fbd_register(struct fb_info* info)" when the USB device is plugg=
ed or
> >>> udl.ko is loaded. Is this a known issue?
> >>>=20
> >>> REF: https://svnweb.freebsd.org/base/head/sys/dev/usb/video/udl.c=

> >>>=20
> >>> --HPS
> >>=20
> >> I just bought a DisplayLink adapter that's compatible. Compiling a=
 new
>=20
> >> kernel with device udl brings this error:
> Hi,
>=20
> You need to also build the "sys/modules/videomode" and install and kl=
dload.
>=20
> Does your device need a power supply?
>=20
> Can you plug the device through an external USB HUB after boot?
>=20
> Also you need some VT patches, before it will attach to VT which I ca=
n
> send you. See attachment.
>=20
> Beware the unplugging the device is not supported. It will crash / pa=
nic
> which needs to be resolved.
>=20
> --HPS

(FYI: I'm switching email accounts from lattera@gmail.com to=20
shawn.webb@hardenedbsd.org)

So I'm a little unsure how to test this. Could you provide some instruc=
tions?

I bought this device: http://www.iogear.com/support/dm/driver/GUC2020DW=
6
It's listed in udl.c as supported:=20
https://svnweb.freebsd.org/base/head/sys/dev/usb/video/udl.c?revision=3D=
278852&view=3Dmarkup#l151

What kind of setup should I have in my xorg.conf to tell xorg to use th=
at=20
instead of the built-in laptop display? Can you provide an example xorg=
.conf?

=2D-=20
Shawn Webb
HardenedBSD

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