Hi Dave, Sorry for interrupt. I'm currently testing the MST audio with HSW. Could you please help tell how I can say DP1.2 works? I connect a DP1.2 monitor to HSW and a DP1.1 monitor to DP1.2 monitor output. In this mode, can I make the 2 monitors show different contents? Thanks. Regards, Libin > -----Original Message----- > From: Dave Airlie [mailto:airlied@xxxxxxxxx] > Sent: Friday, June 19, 2015 6:38 PM > To: Lin, Mengdong > Cc: Takashi Iwai; Yang, Libin; Lu, Han; alsa-devel@xxxxxxxxxxxxxxxx; intel- > gfx@xxxxxxxxxxxxxxxxxxxxx; Girdwood, Liam R > Subject: Re: [alsa-devel] DP MST audio support > > Just to fill in the info on this one. > > > We don't have Haswell Lenovo t440s atm, so could you share more > info? > > - Dell U2410 should support both HDMI and DP input. But I guess it > cannot > > support DP MST, right? > > - Are you connecting this monitor a DP cable? > > Which DDI port is used? DDI B, C or D? > > - Does audio fail after i915 enables DP MST? > > - Is patch "snd/hdmi: hack out haswell codec workaround" the only > change > > on audio driver side? > > Yes its a DP SST input on the U2410, and I'm using that for the audio. > > It's connected to the Lenovo dock with DP cable. The dock is an MST > device. > > The dock is connected to DDI C I think, and if the dock is operated in > SST > mode audio works, but in MST mode audio fails. (operating the dock in > SST > mode isn't useful though since only one of the multiple outputs works > then). > > >> > The graphics side patches are fairly trivial, also it would be good to > >> > get a good explaination of how the hw works, > >> > > >> > from what I can see devices get connections not pins on this hw, > and I > >> > notice that I don't always get 3 devices, so I'm not sure if devices > >> > are a dynamic thing we should be reprobing on some signal. > > > > Do you mean 3 PCM devices here, like pcmC0D3p, pcmC0D7p, > pcmC0D8p? > > Now the devices are not dynamic, a PCM device is created on each pin. > > It seems we need to revise this for DP MST, since a pin can be used to > send > > up to 3 independent streams on Intel GPU which has 3 display > pipelines. > > > > No I mean the "Devices" from snd_hda_get_devices. > > Dave. _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
