Op donderdag 4 januari 2018 16:19:55 CET schreef Takashi Iwai:

On Tue, 26 Dec 2017 15:32:21 +0100,

Freek de Kruijf wrote:

...

I have the following sound devices:

hwinfo --sound Absolute path to 'hwinfo' is '/usr/sbin/hwinfo', so running it may require superuser privileges (eg. root). freek@eiktum:~> /usr/sbin/hwinfo --sound 16: PCI 14.2: 0403 Audio device

[Created at pci.378] Unique ID: 5Dex.BDUuYMOWyw7 SysFS ID: /devices/pci0000:00/0000:00:14.2 SysFS BusID: 0000:00:14.2 Hardware Class: sound Model: "ATI SBx00 Azalia (Intel HDA)" Vendor: pci 0x1002 "ATI Technologies Inc" Device: pci 0x4383 "SBx00 Azalia (Intel HDA)" SubVendor: pci 0x1002 "ATI Technologies Inc" SubDevice: pci 0x4383 Revision: 0x40 Memory Range: 0xfe6f8000-0xfe6fbfff (rw,non-prefetchable) IRQ: 10 (no events) Module Alias: "pci:v00001002d00004383sv00001002sd00004383bc04sc03i00"

Driver Info #0: Driver Status: snd_hda_intel is active Driver Activation Cmd: "modprobe snd_hda_intel"

Config Status: cfg=yes, avail=yes, need=no, active=unknown

26: PCI 500.1: 0403 Audio device

[Created at pci.378] Unique ID: 5yAR.dhjYDcGDBr3 Parent ID: _Znp.ZJmKoWxd6BF SysFS ID: /devices/pci0000:00/0000:00:02.0/0000:05:00.1 SysFS BusID: 0000:05:00.1 Hardware Class: sound Model: "ATI RV770 HDMI Audio [Radeon HD 4850/4870]" Vendor: pci 0x1002 "ATI Technologies Inc" Device: pci 0xaa30 "RV770 HDMI Audio [Radeon HD 4850/4870]" SubVendor: pci 0x1787 "Hightech Information System Ltd." SubDevice: pci 0xaa30 Driver: "snd_hda_intel" Driver Modules: "snd_hda_intel" Memory Range: 0xfe9ec000-0xfe9effff (rw,non-prefetchable) IRQ: 36 (1104 events) Module Alias: "pci:v00001002d0000AA30sv00001787sd0000AA30bc04sc03i00"

Driver Info #0: Driver Status: snd_hda_intel is active Driver Activation Cmd: "modprobe snd_hda_intel"

Config Status: cfg=yes, avail=yes, need=no, active=unknown Attached to: #18 (PCI bridge)

I have my monitor connected via HDMI and that monitor has speakers. The monitor is:

hwinfo --monitor 29: None 00.0: 10002 LCD Monitor

[Created at monitor.125] Unique ID: rdCR.ukgc1_4VzS0 Parent ID: Ddhb.zvQlrOmSRQ8 Hardware Class: monitor Model: "R231" Vendor: ACR Device: eisa 0x0504 "R231" Serial ID: "T6GEE0012400" Resolution: 720x400@70Hz Resolution: 640x480@60Hz Resolution: 640x480@67Hz Resolution: 800x600@56Hz Resolution: 800x600@60Hz Resolution: 1024x768@60Hz Resolution: 1024x768@70Hz Resolution: 1152x864@75Hz Resolution: 1280x1024@60Hz Resolution: 1280x720@60Hz Resolution: 1920x1080@60Hz Size: 509x286 mm Year of Manufacture: 2016 Week of Manufacture: 4

Detailed Timings #0: Resolution: 1920x1080 Horizontal: 1920 2008 2052 2200 (+88 +132 +280) +hsync

   Vertical: 1080 1084 1089 1125 (+4 +9 +45) +vsync

Frequencies: 148.50 MHz, 67.50 kHz, 60.00 Hz

Driver Info #0: Max. Resolution: 1920x1080 Vert. Sync Range: 56-75 Hz Hor. Sync Range: 31-75 kHz Bandwidth: 148 MHz

Config Status: cfg=no, avail=yes, need=no, active=unknown Attached to: #8 (VGA compatible controller)

The sound is working OK, however the problem is that the sound is delayed by about one second compared to the picture on the screen. Most visible/hearable by using Musescore, where a music note is highlighted when it is played. Using VGA and the other sound card there is no delay.

I don't know of such a problem, and I can't think that such a long delay happens in the hardware side.

Which sound backend are you using? Does the same delay happen even if you play directly via aplay with -Dplughw?

I use the Phonon GStreamer as backend.

Using aplay does not reveal the delay between the pictures on the screen and playing the sound. It is most apparent when using Musescore and playing the music notes in the score.

This triggered to take a closer look in Musescore. I found a setting which routes the sound directly to ALSA and not to pulseaudio. Now the sound is synchronized with the picture on the screen. So the problem must be in pulseaudio.

Many thanks for your answer.