Hi, What is exact gitlab issue for this, can you send link? > -----Original Message----- > From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of > Andrzej Kre > Sent: perjantai 13. marraskuuta 2020 22.28 > To: Deak, Imre <imre.d...@intel.com> > Cc: intel-gfx@lists.freedesktop.org; Heikki Krogerus > <heikki.kroge...@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.d...@intel.com > <mailto:imre.d...@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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