[Intel-gfx] USB-C DP mode problem on linux

[Andrzej Kre]

Hi,

Sure.
Ticket #2683
https://gitlab.freedesktop.org/drm/intel/-/issues/2683

Best regards,

sob., 14 lis 2020 o 21:11 Saarinen, Jani <jani.saarinen at intel.com>
napisał(a):

> Hi,
> What is exact gitlab issue for this, can you send link?
>
> > -----Original Message-----
> > From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of
> Andrzej Kre
> > Sent: perjantai 13. marraskuuta 2020 22.28
> > To: Deak, Imre <imre.deak at intel.com>
> > Cc: intel-gfx at lists.freedesktop.org; Heikki Krogerus
> > <heikki.krogerus at linux.intel.com>
> > Subject: Re: [Intel-gfx] USB-C DP mode problem on linux
> >
> > Got it.
> >
> > Thank You for quick replying. Due to coronavirus I was not able to issue
> a ticket
> > quickly . But I created it.
> >
> >
> > Best Regards,
> >
> >
> > wt., 20 paź 2020 o 16:25 Imre Deak <imre.deak at intel.com
> > <mailto:imre.deak at intel.com> > napisał(a):
> >
> >
> >       Hi,
> >
> >       On Mon, Oct 19, 2020 at 05:24:59PM +0300, Heikki Krogerus wrote:
> >       > Hi Andrzej,
> >       >
> >       > On Sat, Oct 17, 2020 at 01:34:54PM +0200, Andrzej Kre wrote:
> >       > > Hi,
> >       > >
> >       > > I know that You were involved in working on USB-C DP drivers.
> >       > > You are my last chance to resolve my issue.
> >       > >
> >       > > On my HP laptop I have Intel UHD Graphics 620.
> >       > > When I'm connecting my 4K monitor to Display Port. It is
> assigning to
> >       > > DP-2-2 socket and  I have full 3840x2160 with 60.00Hz
> >       > > But, when I'm connecting the same monitor to the USB-C port,
> then it is
> >       > > connecting to the DP-1 socket and the maximum that it can
> achieve is
> >       > > 3840x2160 with only 30.00Hz.
> >       > > But I'm making some trick: I'm connecting the same monitor
> through
> > HDMI, so
> >       > > it is connecting to DP-1 socket, and simultaneously I'm
> connecting USB-
> > C,
> >       > > and now USB-C is connecting to DP-2-2 socket (because DP-1 is
> occupied
> > by
> >       > > HDMI) and I can have full 4K with 60Hz.
> >       > > Please, help me, how to force USB-C to connect always to DP-2-2
> > socket?
> >       > > Or do You know maybe where is the problem?
> >       >
> >       > Unfortunately we have no control over the mux in the operating
> system
> >       > on Skylakes, at least in USB subsystem. It all happens in
> firmware.
> >       > Maybe graphics side can do something.
> >       >
> >       > Adding Jani, Imre, Ville and the Intel GFX list.
> >
> >       On SKL/KBL the USB-C -> native DP/HDMI conversion is done by an
> off-CPU
> >       chip and the display driver doesn't have a way either to affect the
> >       muxing.
> >
> >       Not sure why things work on DP-2 and not on DP-1, there is no port
> >       specific limits on the CPU side that would explain this. There is
> a link
> >       training failure in the log, so would be good to see more details
> on
> >       that. Could you file a ticket at
> >       https://gitlab.freedesktop.org/drm/intel/-/issues
> >       providing a full log booting with drm.debug=0x1e for the working
> and
> >       non-working cases?
> >
> >       Thanks,
> >       Imre
> >
>
>
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