Audio
LFS 沒有聲音
我正在嘗試安裝 BLFS 8.4 我已經成功安裝了 alsa-lib 和 alsa-utilities，alsa-mixer 也可以正常工作。我的音效卡是“HDA Intel”。
speaker-test也可以，但會產生不希望的輸出：speaker-test 1.1.8 Playback device is default Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Rate set to 48000Hz (requested 48000Hz) Buffer size range from 2048 to 8192 Period size range from 1024 to 1024 Using max buffer size 8192 Periods = 4 was set period_size = 1024 was set buffer_size = 8192 0 - Front Left Time per period = 2.823178 0 - Front Left Time per period = 2.986632 0 - Front Left Time per period = 2.986640 0 - Front Left Time per period = 2.986624 0 - Front Left Time per period = 2.986635 0 - Front Left Time per period = 2.986632 0 - Front Left Time per period = 2.986626 0 - Front Left Time per period = 2.986631 0 - Front Left Time per period = 2.986632 0 - Front Left Time per period = 2.986633 0 - Front Left Time per period = 2.986628 0 - Front Left ^[[5~Time per period = 2.986638 0 - Front Left Time per period = 2.986628 0 - Front Left Time per period = 2.986633 0 - Front Left ^CWrite error: -4,Interrupted system call xrun_recovery failed: -4,Interrupted system call Transfer failed: Interrupted system callaplay -v /dev/urandom Playing raw data '/dev/urandom' : Unsigned 8 bit, Rate 8000 Hz, Mono Plug PCM: Rate conversion PCM (48000, sformat=U8) Converter: libspeex (external) Protocol version: 10002 Its setup is: stream : PLAYBACK access : RW_INTERLEAVED format : U8 subformat : STD channels : 1 rate : 8000 exact rate : 8000 (8000/1) msbits : 8 buffer_size : 1365 period_size : 170 period_time : 21333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 170 period_event : 0 start_threshold : 1365 stop_threshold : 1365 silence_threshold: 0 silence_size : 0 boundary : 768426686420090880 Slave: Route conversion PCM (sformat=S32_LE) Transformation table: 0 <- 0 1 <- 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : U8 subformat : STD channels : 1 rate : 48000 exact rate : 48000 (48000/1) msbits : 8 buffer_size : 8192 period_size : 1024 period_time : 21333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 8192 stop_threshold : 8192 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 Slave: Soft volume PCM Control: PCM Playback Volume min_dB: -51 max_dB: 0 resolution: 256 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 8192 period_size : 1024 period_time : 21333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 8192 stop_threshold : 8192 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 Slave: Direct Stream Mixing PCM Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 8192 period_size : 1024 period_time : 21333 tstamp_mode : NONE tstamp_type : MONOTONIC period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 8192 stop_threshold : 8192 silence_threshold: 0 silence_size : 0 boundary : 4611686018427387904 Hardware PCM card 0 'HDA Intel' device 0 subdevice 0 Its setup is: stream : PLAYBACK access : MMAP_INTERLEAVED format : S32_LE subformat : STD channels : 2 rate : 48000 exact rate : 48000 (48000/1) msbits : 32 buffer_size : 8192 period_size : 1024 period_time : 21333 tstamp_mode : ENABLE tstamp_type : MONOTONIC period_step : 1 avail_min : 1024 period_event : 0 start_threshold : 1 stop_threshold : 4611686018427387904 silence_threshold: 0 silence_size : 4611686018427387904 boundary : 4611686018427387904 appl_ptr : 0 hw_ptr : 2049^CAborted by signal Interrupt... aplay: pcm_write:2053: write error: Interrupted system callpaplay -v --raw /dev/urandom Opening a playback stream with sample specification 's16le 2ch 44100Hz' and channel map 'front-left,front-right'. Connection established. Stream successfully created. Buffer metrics: maxlength=4194304, tlength=352800, prebuf=349276, minreq=3528 Using sample spec 's16le 2ch 44100Hz', channel map 'front-left,front-right'. Connected to device alsa_output.pci-0000_00_1b.0.analog-stereo (index: 0, suspended: no). Stream started. ^CGot signal, exiting.ncy: 2260381 usec.amixer Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 127 Mono: Playback 127 [100%] [0.00dB] [on] Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 127 Mono: Front Left: Playback 104 [82%] [-17.25dB] [off] Front Right: Playback 104 [82%] [-17.25dB] [off] Simple mixer control 'Speaker',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 127 Mono: Front Left: Playback 127 [100%] [0.00dB] [on] Front Right: Playback 127 [100%] [0.00dB] [on] Simple mixer control 'PCM',0 Capabilities: pvolume Playback channels: Front Left - Front Right Limits: Playback 0 - 255 Mono: Front Left: Playback 255 [100%] [0.00dB] Front Right: Playback 255 [100%] [0.00dB] Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined Playback channels: Mono Mono: Playback [off] Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 15 Front Left: Capture 8 [53%] [12.00dB] [on] Front Right: Capture 8 [53%] [12.00dB] [on] Simple mixer control 'Auto-Mute Mode',0 Capabilities: enum Items: 'Disabled' 'Enabled' Item0: 'Disabled' Simple mixer control 'Internal Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 3 [100%] [30.00dB] Front Right: 3 [100%] [30.00dB]我也找不到
~/.asoundrc，/etc/asound.conf並且有一個配置文件，/etc/alsa/conf.d但書中沒有alsa.conf給出。該命令locate libasound.so顯示目錄/usr/lib/libasound.so，但沒有/usr/lib/alsa-lib/smixer書中給出的目錄。
我的筆記型電腦終於有聲音了！我只是把所有東西都做成了模組
<m>，Device Drivers -> Sound Card Support -> Advanced Linux Sound Architecture它工作了！以下是
lsmod所需模組的輸出：lsmod Module Size Used by snd_hda_codec_hdmi 45056 1 snd_hda_codec_idt 49152 1 snd_hda_codec_generic 65536 1 snd_hda_codec_idt snd_hda_intel 36864 3 snd_hda_codec 98304 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_idt snd_hwdep 16384 1 snd_hda_codec snd_hda_core 65536 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_idt