Running Gentoo, but i ran into this problem under fedora and ubuntu as well. basically, i have no sound, and i can't seem to configure alsa to produce any. alsamixer runs, and detects my card, as does lspci.
lspci -vvv output:
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
Subsystem: Gateway 2000 Unknown device 0318
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64, Cache Line Size: 32 bytes
Interrupt: pin ? routed to IRQ 16
Region 0: Memory at d0500000 (64-bit, non-prefetchable) [size=16K]
Capabilities:  Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Capabilities:  Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
Address: 0000000000000000 Data: 0000
lsmod|grep snd output:
snd_seq 43856 0
snd_seq_device 10252 1 snd_seq
snd_hda_intel 210328 0
snd_pcm 61060 1 snd_hda_intel
snd_timer 21252 2 snd_seq,snd_pcm
snd 38392 5 snd_seq,snd_seq_device,snd_hda_intel,snd_pcm,snd_timer
snd_page_alloc 12424 2 snd_hda_intel,snd_pcm
alsa is configured from source, i built my kernel without alsa and then built it in later.
i've seen a lot of talk about the snd_hda_intel driver not working correctly, but i haven't seen any clear solutions. perhaps someone here has experience with it?
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