如何在 Lubuntu 上设置 VolumeUp、VolumeDown 和静音快捷键？

在我的配置（~/.config/openbox/lubuntu-rc.xml）中，我的多媒体键设置如下：

<!-- Keybinding for Volume management -->
<keybind key="XF86AudioRaiseVolume">
  <action name="Execute">
    <command>amixer -q sset Master 3%+ unmute</command>
  </action>
</keybind>

经过xev我检查，这些是正确的键。

但它不起作用。AFAIU，问题是我的声卡设置没有主设备。

输出amixer scontrols：

Simple mixer control 'IEC958',0
Simple mixer control 'IEC958',1
Simple mixer control 'IEC958',2
Simple mixer control 'IEC958',3
Simple mixer control 'IEC958',4

我试过像：

amixer -q sset IEC958 3%+ unmute

但它不影响音量。

如果我运行alsamixer，它看起来并不好：

┌────────────────────── AlsaMixer v1.1.3 ──────────────────────┐
│ Card: HDA Intel HDMI                 F1:  Help               │
│ Chip: Intel Haswell HDMI             F2:  System information │
│ View: Playback                       F6:  Select sound card  │
│ Item: S/PDIF                         Esc: Exit               │
│                                                              │
│                                                              │
│                                                              │
│                                                              │
│                                                              │
│           ┌──┐     ┌──┐     ┌──┐     ┌──┐     ┌──┐           │
│           │OO│     │OO│     │OO│     │OO│     │OO│           │
│           └──┘     └──┘     └──┘     └──┘     └──┘           │
│        < S/PDIF >S/PDIF 1 S/PDIF 2 S/PDIF 3 S/PDIF 4         │
│                                                              │
│                                                              │
│                                                              │
│                                                              │
│                                                              │
└──────────────────────────────────────────────────────────────┘ 

如您所见，也没有修剪音量。

开始栏上的音量应用程序工作正常，pavucontrol 也是如此。

但是如何设置键盘快捷键以与我的设置一起使用？

Lubuntu 18.04，联想 Thinkpad X240 lspci，：

00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation 8 Series USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series HECI #0 (rev 04)
00:16.3 Serial controller: Intel Corporation 8 Series HECI KT (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I218-LM (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 6 (rev e4)
00:1c.1 PCI bridge: Intel Corporation 8 Series PCI Express Root Port 3 (rev e4)
00:1d.0 USB controller: Intel Corporation 8 Series USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation 8 Series LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 8 Series SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series SMBus Controller (rev 04)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)