[ATI RS690/780 HDMI] (Radeon driver) VLC audio becomes distorted without tsched=0
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
alsa-driver (Ubuntu) |
Expired
|
Low
|
Unassigned |
Bug Description
Bug #751265 describes the symptom: when VLC uses Pulseaudio for audio output, the sound from it becomes garbled after playing for a while, with heavy digital artefacts and echoing. Comment #23 in that report suggests modifying /etc/pulse/
I believe apport adds data about the hardware automatically. I'll add to that that for me this only occurs with the Radeon HDMI output; through the analog output (via headphones) the audio works fine. As Bug #864735 describes, Radeon audio is off by default in recent kernels, but I've re-enabled it by passing the radeon.audio=1 kernel commandline parameter.
If I switch to ALSA output for VLC (without tsched=0), VLC audio goes mute after a while. After some time of silence it sort of fast forwards itself to get up to sync with the video again. This keeps repeating, so it's not really a workaround.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.24+
ProcVersionSign
Uname: Linux 3.2.0-14-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
/dev/snd/pcmC1D3p: jani 2717 F...m pulseaudio
/dev/snd/
/dev/snd/timer: jani 2717 f.... pulseaudio
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xfe8f4000 irq 16'
Mixer name : 'Realtek ALC887'
Components : 'HDA:10ec0887,
Controls : 43
Simple ctrls : 20
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xfeae8000 irq 19'
Mixer name : 'ATI RS690/780 HDMI'
Components : 'HDA:1002791a,
Controls : 4
Simple ctrls : 1
Card1.Amixer.
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
CheckboxSubmission: 09ae689090491ca
CheckboxSystem: edda5d4f616ca79
Date: Sun Feb 5 23:38:14 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
PackageArchitec
SourcePackage: alsa-driver
Symptom: audio
Symptom_
Symptom_Card: RS780 HDMI Audio [Radeon HD 3000-3300 Series] - HDA ATI HDMI
Symptom_Jack: Digital Out, HDMI
Symptom_Type: Digital clip or distortion, or "overdriven" sound
Title: [System Product Name, ATI RS690/780 HDMI, Digital Out, HDMI] Sound is distorted
UpgradeStatus: Upgraded to precise on 2012-01-17 (19 days ago)
dmi.bios.date: 08/12/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.
dmi.board.name: M4A78-EM
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.
dmi.modalias: dmi:bvnAmerican
dmi.product.name: System Product Name
dmi.product.
dmi.sys.vendor: System manufacturer
Hi Jani!
The reason radeon.audio is off by default is that they don't feel they've got it sufficiently bug free. So neither upstream nor Ubuntu supports it at this point. Does it work with the fglrx driver?