Disable HDMI sound out, for decrease power consumption

Question

I have Ubuntu 12.04 on my laptop I'm looking for a way to decrease power consumption. This is output of powertop command

Power est.      Usage       Events/s    Category       Description
1.30 W          100.0%                  Device         Audio codec hwC0D0: Realtek

I googled a little and find this 100.0% usage related to digital output through HDMI port. I'm looking for a way to disable digital output or HDMI pot, I don't use this port anyway. Also I want to have sound. I put some sound module in /etc/modprobe.d/blacklist.conf

blacklist snd_hda_codec_realtek
blacklist snd_hda_intel
blacklist snd_hda_codec

Problem solved, but there is not any sound. Any idea appreciated in advance.

Edited : More illustration about the problem

output of 'aplay -l' is

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC269VB Analog [ALC269VB Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 1: ALC269VB Digital [ALC269VB Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I've wanted to turn off Digital device, because i thinked it is source of power consumption, according to powertop's output.

Here, what I did. Added following line at the end of /etc/modprobe.d/blacklist.conf

blacklist snd_hda_codec_realtek

After restart, Output of aplay -l is:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

and output of lsmod | grep snd is

snd_hda_intel          32765  3 
snd_hda_codec         109562  1 snd_hda_intel
snd_hwdep              13276  1 snd_hda_codec
snd_pcm                80916  3 snd_hda_intel,snd_hda_codec
snd_seq_midi           13132  0 
snd_rawmidi            25424  1 snd_seq_midi
snd_seq_midi_event     14475  1 snd_seq_midi
snd_seq                51592  2 snd_seq_midi,snd_seq_midi_event
snd_timer              28931  2 snd_pcm,snd_seq
snd_seq_device         14172  3 snd_seq_midi,snd_rawmidi,snd_seq
snd                    62218  13     snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore              14635  1 snd
snd_page_alloc         14108  2 snd_hda_intel,snd_pcm

Unfortunately output of powertop shows no change

powertop : in Device stats
Power est.    Usage     Device name
1.26 W        100.0%    Audio codec hwC0D0: Realtek

Also in this situation i have not any sound!

Again, I'm looking forward to see your opinion, idea.