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debian/sid下重起後,/dev/下面的文件的權限模式被改變了



每次系統重起,都會把/dev/mixer的權限模式改成000,導致xmms
無法使用。

以前沒有這樣的,我搜索了/etc/init.d目錄下的所有文件,發現
沒有包含chmod 000命令的這樣的文件,我啟動到單用戶目錄下,
發現那些文件的權限還是改變了。

我查找了系統記錄,在setuid.change裡面倒是有和/dev/mixer相
關的記錄,如下:
-----------------------------------------------
-    4549   666   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer0
+    4549     0   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer0
-    5313   666   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer1
-    5314   666   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer2
-    5315   666   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer3
+    5313     0   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer1
+    5314     0   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer2
+    5315     0   1 root       audio              0 Sat Jul 13 18:22:35 2002 /dev/mixer3
-   37849   660   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer0
-   37850   660   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer1
-   37851   660   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer2
-   37852   660   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer3
+   37849     0   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer0
+   37850     0   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer1
+   37851     0   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer2
+   37852     0   1 root       audio              0 Sat Jul 13 18:22:36 2002 /dev/amixer3
-----------------------------------------------

不是很清楚怎麼回事,哪位能解釋一下嗎?

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