sound on Acer Aspire AO722 (KDE Desktop)

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sound on Acer Aspire AO722 (KDE Desktop)

Postby RJVB on Mon Mar 03, 2014 6:21 am

I'm running LMDE on an Acer AO722/JE10-BZ with BIOS V1.11 .

Code: Select all
# lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 14h Processor Root Complex
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6290]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler HDMI Audio
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 SMBus Controller (rev 42)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SBx00 PCI to PCI Bridge (rev 40)
00:15.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
00:15.2 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB900 PCI to PCI bridge (PCIE port 2)
00:15.3 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] SB900 PCI to PCI bridge (PCIE port 3)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 0 (rev 43)
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 6
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 5
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 7
06:00.0 Ethernet controller: Qualcomm Atheros AR8152 v2.0 Fast Ethernet (rev c1)
07:00.0 Network controller: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller (rev 01)


Everything works fine (slow, but fine :) ) except an issue I have with sound. In fact, I have 2 issues.

Soundwise, my main use for this netbook is an audio source, connected over HDMI to a good AV amp that also acts as an external DAC, the goal being bitperfect output.

However, I'd also like to be able to watch (internet/streaming) video from time to time, and that will typically not be over the AV amp. I'd also like to have my notifications play, but not over the amp getting mixed in with the music I'm playing.
Since I run a KDE desktop, I have the choice of output system for music, notifications, videos and a couple of other activities. Music is to go out over HDMI, the rest through the internal sound system/speakers.
I'm using the AMD fglrx driver with the VLC phonon backend (both apparently required to get HDMI out working).

Issue 1:
I cannot get the internal speakers to play. Or rather, they worked for a while, then stopped working until I applied UP8, and now they're mute again. The Phonon control panel shows the devices, but 1) the Test button in the Device Preference tab only sounds for HDMI out and 2) the test buttons in the hardware setup tab don't sound whatever I try.
I can launch pavucontrol by hand and then connect a stream to the desired output device, but I'd like this work automatically as configured in Phonon.

As a side-note to anyone interested, I've been able to create a virtual resolution for the AV amp identical to my weird 1366x768 LCD panel resolution. This allows me to "clone" the desktop to the AV amp which is recognised as a projector despite the fact it doesn't have a monitor attached, and avoid getting graphics glitches. I can post the script that does this, on request.

The 2nd issue has to do with bit-perfect output with pulseaudio.

Issue 2:
My AV amp is able to accept and convert a wide range of sample rates, yet I seem to get only 44.1kHz and 48kHz. Now that covers most of my music library, and most content at higher rates is at 96kHz which samples down to 48 with minimal loss, but I'd like to understand why I cannot simply get the sound stack to put the amp at the appropriate sample rate. Or even to set it to 44.1kHz OR 96kHz, because 48kHz upsamples to 96kHz with less loss than downsampling the other way. I tried setting the pulseaudio alternative sample rate to 96kHz but that didn't work as expected. Ideas, anyone?
RJVB
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