$ cat /proc/asound/card1/eld#1.0
monitor_present 1
eld_valid 1
monitor_name LG TV
connection_type HDMI
eld_version [0x2] CEA-861D or below
edid_version [0x3] CEA-861-B, C or D
manufacture_id 0x6d1e
product_id 0x1
port_id 0x20000
support_hdcp 0
support_ai 0
audio_sync_delay 0
speakers [0xffff] FL/FR LFE FC RL/RR RC FLC/FRC RLC/RRC FLW/FRW
FLH/FRH TC FCH
sad_count 2
sad0_coding_type [0x2] AC-3
sad0_channels 6
sad0_rates [0xe0] 32000 44100 48000
sad0_max_bitrate 640000
sad1_coding_type [0x1] LPCM
sad1_channels 2
sad1_rates [0x14e0] 32000 44100 48000 96000 192000
sad1_bits [0xe0000] 16 20 24
$ cat /proc/asound/card1/pcm7p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 2
rate: 48000 (48000/1)
period_size: 1024
buffer_size: 8192
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1181721
Title:
NVIDIA HDMI audio needs a bigger bdl_pos_adj
Status in “alsa-driver” package in Ubuntu:
Confirmed
Bug description:
Right after my system finishes booting, when it plays the welcome
sound, I get this in dmesg:
hda-intel: IRQ timing workaround is activated for card #1. Suggest a
bigger bdl_pos_adj
This gives me a few bad side effects:
1) Sound latency is way too high with pulseaudio, and it's even higher
with alsa dmix.
2) Bad sound quality in most of the games I've tried (sound
interrupts, distortion, lots of buffer underruns).
3) Crackling noise in MAME (specially with older games).
Adding the following line to "/etc/modprobe.d/alsa-base.conf" seems to solve
my problems:
options snd-hda-intel enable_msi=1 bdl_pos_adj=-1,64
After that, I don't get the error in dmesg anymore, sound latency is
much better, and the buffer underruns / crackling are gone.
So I suggest a bigger "bdl_pos_adj" should be made default for NVIDIA
HDMI sound cards. I'm not saying it should be 64, because this value
is guessed.
-1, 1, 32 will give me the error in dmesg and all related problems
48 gives me mixed results, no error in dmesg, but I still get buffer
underruns sometimes
64 gives me bigger latency than 48, but I didn't get any buffer
underruns with this value so far.
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
Uname: Linux 3.9.0-030900-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Sun May 19 07:50:55 2013
MarkForUpload: True
PackageArchitecture: all
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: alsa-driver
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/17/2012
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BGP6710J.86A.2209.2012.0717.2302
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: DP67BG
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG10491-306
dmi.chassis.type: 3
dmi.modalias:
dmi:bvnIntelCorp.:bvrBGP6710J.86A.2209.2012.0717.2302:bd07/17/2012:svn:pn:pvr:rvnIntelCorporation:rnDP67BG:rvrAAG10491-306:cvn:ct3:cvr:
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