> -----Original Message----- > From: intel-gfx- > bounces+vijay.a.purushothaman=intel.com at lists.freedesktop.org > [mailto:intel-gfx- > bounces+vijay.a.purushothaman=intel.com at lists.freedesktop.org] On Behalf Of > Wu Fengguang > Sent: Monday, November 14, 2011 6:56 PM > To: Takashi Iwai > Cc: Wang, Zhenyu Z; intel-gfx at lists.freedesktop.org; Barnes, Jesse; Jeremy > Bush; Christopher White; Bossart, Pierre-louis > Subject: Re: [PATCH v5] drm/i915: pass ELD to HDMI/DP audio > driver > > On Mon, Nov 14, 2011 at 05:45:12PM +0800, Takashi Iwai wrote: > > At Sat, 12 Nov 2011 10:27:26 +0800, > > Wu Fengguang wrote: > > > > > > (snip) > > > > > > > > And I'm not sure whether HDMI audio is played > > > > > > > > while DPMS is off. I haven't tested it. > > > > > > > > > > > > > > It will go silence on DPMS. I noticed this while doing long > term HDMI > > > > > > > audio playback tests. This should better be fixed in future on > the > > > > > > > graphics side. > > > > > > > > > > > > Hm, but I wonder what could be done alternatively. > > > > > > Hopefully there is a register for video-only control... > > > > > > > > > > There may be some mode that can keep video off while still keep > > > > > minimal signals to play HDMI sound? > > > > > > > > Let's hope :) You can turn off only the plane (but don't turn off the pipe & port) to achieve this. Not much of power saving compared to DPMS though. > > > > > > Looks very possible, here is the clue of hardware support: > > > > > > TRANS_DP_CTL - Transcoder DisplayPort Control > > > > > > bit 26: Transcoder DP Audio Only Mode > > > > Good to know! But what about HDMI? > > I'm not sure.. There are no corresponding TRANS_HDMI_CTL registers... > Bit 26 of TRANS_DP_CTL does not work. Also there is no such bit for HDMI. > Thanks, > Fengguang > _______________________________________________ > Intel-gfx mailing list > Intel-gfx at lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/intel-gfx Thanks, Vijay
