Whenever I log into KDE kmix is muted. Unmuting it has no effect. The only way to get sound is to run alsaconfig

Here some details:

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toad@deskarch 880\7 ~ > lspci -vvv | grep Audio -A 10
00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller
        Subsystem: ASRock Incorporation Device 0888
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 22
        Region 0: Memory at f94f8000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

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toad@deskarch 880\8 ~ > cat /proc/interrupts
           CPU0       CPU1       
  0:         47          0   IO-APIC-edge      timer
  1:        705        699   IO-APIC-edge      i8042
  4:          1          1   IO-APIC-edge   
  6:          2          3   IO-APIC-edge      floppy
  8:          3          1   IO-APIC-edge      rtc0
  9:          0          0   IO-APIC-fasteoi   acpi
 12:      52018      51980   IO-APIC-edge      i8042
 16:      72201      71990   IO-APIC-fasteoi   uhci_hcd:usb4, nvidia
 18:          0          0   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb9
 19:      72830      72829   IO-APIC-fasteoi   pata_jmicron, uhci_hcd:usb6, uhci_hcd:usb8
 20:          0          0   IO-APIC-fasteoi   uhci_hcd:usb11
 21:          0          0   IO-APIC-fasteoi   ehci_hcd:usb3, uhci_hcd:usb5
 22:     132412     133249   IO-APIC-fasteoi   firewire_ohci, hda_intel
 23:     279258     278455   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb7, uhci_hcd:usb10
 45:      35450      35464   PCI-MSI-edge      ahci
 46:      67073      67282   PCI-MSI-edge      eth0
NMI:          0          0   Non-maskable interrupts
LOC:    1950055    1828178   Local timer interrupts
SPU:          0          0   Spurious interrupts
PMI:          0          0   Performance monitoring interrupts
PND:          0          0   Performance pending work
RES:      44880      32854   Rescheduling interrupts
CAL:       5333       4702   Function call interrupts
TLB:      27956      22058   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
MCE:          0          0   Machine check exceptions
MCP:         24         24   Machine check polls
ERR:          1
MIS:          0

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toad@deskarch 880\9 ~ > dmesg | grep -i hda
HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
hda_intel: msi for device 1849:0888 set to 0
hda_intel: position_fix set to 1 for device 1849:0888
HDA Intel 0000:00:1b.0: setting latency timer to 64
hda_codec: ALC888: BIOS auto-probing.
input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:1b.0/input/input5
hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj.


Anybody else out there who knows what may be going on?

Are you using pulseaudio?

To be honest, I don't know. System says it is installed, so my guess would be: yes

I've never had to do anything with sound as it always worked out of the box. I've had xine and VLC as a back-end to phonon but the problem persists in both cases. And Jack appears to be there, also...

Try opening pavucontrol, select Output Devices, and make sure that isn't muted.

Okay, had to install it and it worked!

Thanks for your help

What I can't figure out is why pulseaudio always mutes on startup.

On my system this doesn't occur... have you checked your KMix settings?