Comment 0 for bug 1556228

At first there was no native recognition of my sound driver (see this [ https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1525554 ] a lot of others a experiencing this problem)
so there was a workaround to fix that, the notebook has sound output now, but ever since i got these horrible scratching noises while booting, which i dont have booting windows, which is kinda surprising while one could take it for a bios or hardware problem.

basic workaround for fixing missing sound driver was adding two lines to the /etc/modprobe.d/alsa-base.conf
options snd-hda-intel single_cmd=1
options snd-hda-intel probe_mask=1

with these lines a was able to get sound, but i then have these crazy noises while booting.

the following are some lines from the terminal which might help:

'lsb_release -rd'
Ubuntu 15.10

cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version k4.2.0-30-generic.

uname -a
Linux 15 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

lspci -v | grep -A7 -i "audio"
00:1f.3 Multimedia audio controller: Intel Corporation Device 9d70 (rev 21)
 Subsystem: Hewlett-Packard Company Device 8100
 Flags: bus master, fast devsel, latency 64, IRQ 16
 Memory at c1320000 (64-bit, non-prefetchable) [size=16K]
 Memory at c1310000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: <access denied>
 Kernel driver in use: snd_hda_intel

lsmod | grep snd
snd_hda_codec_hdmi 49152 1
snd_hda_intel 36864 2
snd_hda_codec 135168 2 snd_hda_codec_hdmi,snd_hda_intel
snd_hda_core 65536 3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_hwdep 16384 1 snd_hda_codec
snd_pcm 106496 4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_core
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi_event,snd_seq_midi
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer 32768 2 snd_pcm,snd_seq
snd 81920 13 snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec,snd_hda_intel,snd_seq_device
soundcore 16384 1 snd

cat /proc/asound/cards
 0 [PCH ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xc1320000 irq 129

even adding the right driver and module into /etc/modules (like snd-hda-intel model=PCH index=0) did not work, like i found in this thread ( https://wiki.ubuntuusers.de/Soundkarten_konfigurieren/ ) sorry for the german thread.

i dont know what to add anymore. feel free to ask.