有关声卡和tar问题

shitou850

我是linux新手。
redhat8.0,点击声卡检测先是的模块我已在内核里编译进去,但在点击音量控制器时出现
错误:gmome-volume-control "无法打开音频设备,请确认你拥有打开 /dev/mixer 的权限,或在模块已加如声音支持." 是怎么回事啊??!!!

还有我在用tar解压文件时,每个文件都出现
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linux-2.6.4/REPORTING-BUGS
tar: linux-2.6.4/REPORTING-BUGS: Cannot change ownership to uid 500, gid 500: Operation not permitted
linux-2.6.4/COPYING
tar: linux-2.6.4/COPYING: Cannot change ownership to uid 500, gid 500: Operation not permitted
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我换了几个压缩文件试都一样.哪位能告诉我是怎么回事?

caustic

maybe you are not the root user