即使静音，Ubuntu 18.04 扬声器也会破裂

Question

我的旧扬声器在 xubuntu 18.04 上破裂了。从 USB 启动 Windows 时扬声器可以正常工作。该 PC 配有华硕 p8p67 主板。

扬声器即使不播放声音也会破裂，看起来就像每次都新插入扬声器一样，并且每次都会在右上角弹出音量条。

lspci -v 
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
    Subsystem: ASUSTeK Computer Inc. 6 Series/C200 Series Chipset Family High Definition Audio Controller
01:00.1 Audio device: NVIDIA Corporation GF114 HDMI Audio Controller (rev a1)
    Subsystem: eVga.com. Corp. GF114 HDMI Audio Controller