我刚刚在新的 inspiron 14z 上安装了 12.04,系统开始加载后,开始发出白噪声。当我播放任何歌曲或互联网音乐时,它都能正常工作,但噪声仍然存在。我尝试关闭所有音量控制,但噪声仍然存在。有人能帮助我或给我一些线索来找到解决方案吗?谢谢
答案1
问题可能在于声卡目前不支持 ALSA Intel HDA 模块(自 v1.0.24 起)。您可以使用以下命令检索卡的型号
$ cat /proc/asound/card0/codec* | grep Codec
在我的例子中返回
Codec: IDT92HD91BXX
Codec: Intel PantherPoint HDMI
(第一个是有趣的)。支持的卡列表可以在 [www.kernel.org/doc/Documentation/sound/alsa/HD-Audio-Models.txt] 找到,最新的似乎是92HD83*
。
然而,在对优秀HDA 分析器工具,我发现可以通过设置其中一个GPIO来解决该问题:
(我本来想在这里发布一张图片,但我的声誉不够)。
该工具可用于导出一个 Python 脚本,该脚本可重现通过 GUI 所做的修改。以下是脚本内容(我稍作修改):
#!/usr/bin/env python
# This scripts eliminates the noise produced on resume
# by Intel IDT 92HD91BXX cards controlled by the hda-intel driver
# (ALSA v1.0.24)
import os
import struct
from fcntl import ioctl
from time import sleep
def __ioctl_val(val):
# workaround for OverFlow bug in python 2.4
if val & 0x80000000:
return -((val^0xffffffff)+1)
return val
IOCTL_INFO = __ioctl_val(0x80dc4801)
IOCTL_PVERSION = __ioctl_val(0x80044810)
IOCTL_VERB_WRITE = __ioctl_val(0xc0084811)
def set(nid, verb, param):
verb = (nid << 24) | (verb << 8) | param
res = ioctl(FD, IOCTL_VERB_WRITE, struct.pack('II', verb, 0))
attempts = 0
while((not os.path.exists("/dev/snd/hwC0D0")) and attempts < 50):
attempts += 1
sleep(0.1)
FD = os.open("/dev/snd/hwC0D0", os.O_RDONLY)
info = struct.pack('Ii64s80si64s', 0, 0, '', '', 0, '')
res = ioctl(FD, IOCTL_INFO, info)
name = struct.unpack('Ii64s80si64s', res)[3]
if not name.startswith('HDA Codec'):
raise IOError, "unknown HDA hwdep interface"
res = ioctl(FD, IOCTL_PVERSION, struct.pack('I', 0))
version = struct.unpack('I', res)
if version < 0x00010000: # 1.0.0
raise IOError, "unknown HDA hwdep version"
# initialization sequence starts here...
set(0x01, 0x716, 0x02) # 0x01071602 (SET_GPIO_MASK)
os.close(FD)
为了在启动时执行脚本,首先将其保存到/usr/local/sbin/fix-idt-codec
,然后创建初始化脚本/etc/init/fix-idt-codec.conf
:
# fix-idt-codec - Fixes issues with snd-hda-intel
#
# This scripts eliminates the noise produced on resume
# by Intel IDT 92HD91BXX cards controlled by the hda-intel driver
# (ALSA v1.0.24)
description "Fix Intel HDA IDT Codec issues"
start on runlevel [2345]
task
exec /usr/local/sbin/fix-idt-codec
现在重新启动,问题就应该解决了。
为了完整起见,有些人记录了一个额外的问题此主题:白噪声在挂起/恢复循环后再次出现(奇怪的是,当您插入耳机时它会消失)。要修复此问题,您可以添加一个名为的文件,其20_fix-idt-codec
内容/etc/pm/sleep.d
如下:
#!/bin/sh
# This scripts eliminates the noise produced on resume
# by Intel IDT 92HD91BXX cards controlled by the hda-intel driver
# (ALSA v1.0.24)
#
PATH=/sbin:/usr/sbin:/bin:/usr/bin
HELPER=/usr/local/sbin/fix-idt-codec
if [ ! -f $CODEC ]; then
exit 0
fi
case "${1}" in
resume|thaw)
if [ -f $HELPER ]; then
python $HELPER
fi
;;
esac
希望对您有所帮助。我在调试过程中发现以下链接非常有用:
- 帮助调试英特尔 HDA - [www.alsa-project.org/main/index.php/Help_To_Debug_Intel_HDA]
- 矩阵:模块-hda-intel - [www.alsa-project.org/main/index.php/Matrix:Module-hda-intel]
- 音频调试技术 - [voices.canonical.com/david.henningsson/2011/12/08/audio-debugging-techniques/]
- HdaIntelSoundHowto - [help.ubuntu.com/community/HdaIntelSoundHowto]