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All of a sudden I don't hear any audio anymore on my Lenovo Thankpad Edge E535.

stefan@ThinkPad-E535:~$ lsb_release -d
Description:    Ubuntu 13.10
stefan@ThinkPad-E535:~$ uname -r
3.11.0-18-generic
stefan@ThinkPad-E535:~$ cat /proc/asound/cards
 0 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xf0344000 irq 49
 1 [Generic        ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xf0340000 irq 16
29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
                      ThinkPad Console Audio Control at EC reg 0x30, fw unknown
stefan@ThinkPad-E535:~$ aplay -l
**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: HDMI [HDA ATI HDMI], Gerät 3: HDMI 0 [HDMI 0]
  Sub-Geräte: 0/1  
  Sub-Gerät #0: subdevice #0
Karte 1: Generic [HD-Audio Generic], Gerät 0: CX20590 Analog [CX20590 Analog]
  Sub-Geräte: 1/1
  Sub-Gerät #0: subdevice #0
stefan@ThinkPad-E535:~$ aplay /usr/share/sounds/alsa/Noise.wav
Wiedergabe: WAVE '/usr/share/sounds/alsa/Noise.wav' : Signed 16 bit Little Endian, Rate: 48000 Hz, mono
stefan@ThinkPad-E535:~$ lspci -nnk | grep -iA2 audio
00:01.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Trinity HDMI Audio Controller [1002:9902] Subsystem: Lenovo Device [17aa:5100]  Kernel driver in use: snd_hda_intel
--
00:14.2 Audio device [0403]: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller [1022:780d] (rev 01) Subsystem: Lenovo Device [17aa:5100] Kernel driver in use: snd_hda_intel
stefan@ThinkPad-E535:~$ ps -C esd  
  PID TTY          TIME CMD
stefan@ThinkPad-E535:~$ ps -C arts
  PID TTY          TIME CMD
stefan@ThinkPad-E535:~$ ps -C pulseaudio
  PID TTY          TIME CMD
 1524 ?        00:00:18 pulseaudio
stefan@ThinkPad-E535:~$ grep "^audio" /etc/group | grep "$USER" | wc -l
0
stefan@ThinkPad-E535:~$ lsmod | grep "snd"
snd_hda_codec_conexant    57441  1 
snd_hda_codec_hdmi     41154  1 
snd_hda_intel          52267  7 
snd_hda_codec         188738  3  snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep              13602  1 snd_hda_codec
snd_pcm               102033  4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc         18710  2 snd_pcm,snd_hda_intel
snd_seq_midi           13324  0 
snd_seq_midi_event     14899  1 snd_seq_midi
snd_rawmidi            30095  1 snd_seq_midi
snd_seq                61560  2 snd_seq_midi_event,snd_seq_midi
snd_seq_device         14497  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              29433  2 snd_pcm,snd_seq
snd                    69141  25 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,thinkpad_acpi,snd_seq_device,snd_seq_midi
soundcore              12680  1 snd
stefan@ThinkPad-E535:~$ head -n 3 /proc/asound/card0/codec#0
Codec: ATI R6xx HDMI
Address: 0
AFG Function Id: 0x1 (unsol 0)
stefan@ThinkPad-E535:~$ head -n 3 /proc/asound/card0/codec97#0/ac97#0-0
head: »/proc/asound/card0/codec97#0/ac97#0-0“ kann nicht zum Lesen geöffnet werden:     Datei oder Verzeichnis nicht gefunden
stefan@ThinkPad-E535:~$ head -n 3 /proc/asound/card0/codec97#0/ac97#0-0+regs
head: »/proc/asound/card0/codec97#0/ac97#0-0+regs“ kann nicht zum Lesen geöffnet werden: Datei oder Verzeichnis nicht gefunden
stefan@ThinkPad-E535:~$ cat ~/.asoundrc
cat: /home/stefan/.asoundrc: Datei oder Verzeichnis nicht gefunden
stefan@ThinkPad-E535:~$ cat ~/.asoundrc.asoundconf
cat: /home/stefan/.asoundrc.asoundconf: Datei oder Verzeichnis nicht gefunden
stefan@ThinkPad-E535:~$ cat /etc/asound.conf 
cat: /etc/asound.conf: Datei oder Verzeichnis nicht gefunden
stefan@ThinkPad-E535:~$ 

Tried several things incl. removing alsa settings file /var/lib/alsa/asound.state, but without any result.

Does anybody have a clue what the root cause may be here? Thanks! Any ideas?

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