Volume buttons on keyboard

[Santino1]

Hi,
I have another issue with my Mint 18.1 KDE. So, after installing Linux, I have had some problems with sound(solved problem in BIOS), and I fixed sound and now it works fine, but I noticed that I can't seen volume icon in panel. This is not problem, but when I have tried volume up/down/mute buttons on keyboard, it doesn't work.

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System:    Host: santino-HP-Notebook Kernel: 4.4.0-78-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: KDE Plasma 5.8.6 (Qt 5.6.1) Distro: Linux Mint 18.1 Serena
Machine:   System: HP product: HP Notebook v: Type1ProductConfigId
           Mobo: HP model: 81EE v: 62.38 Bios: Insyde v: F.23 date: 12/01/2016
CPU:       Dual core Intel Core i5-7200U (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 10847
           clock speeds: max: 3100 MHz 1: 1057 MHz 2: 1031 MHz 3: 1048 MHz 4: 1000 MHz
Graphics:  Card-1: Intel Device 5916 bus-ID: 00:02.0
           Card-2: Advanced Micro Devices [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330]
           bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: ati,radeon,intel (unloaded: fbdev,vesa)
           Resolution: 1366x768@60.00hz
           GLX Renderer: Mesa DRI Intel Kabylake GT2
           GLX Version: 3.0 Mesa 11.2.0 Direct Rendering: Yes
Audio:     Card Intel Device 9d71 driver: snd_hda_intel bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.4.0-78-generic
Network:   Card-1: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
           driver: r8169 v: 2.3LK-NAPI port: 4000 bus-ID: 02:00.0
           IF: enp2s0 state: down mac: <filter>
           Card-2: Realtek RTL8723BE PCIe Wireless Network Adapter
           driver: rtl8723be port: 3000 bus-ID: 03:00.0
           IF: wlo1 state: up mac: <filter>
Drives:    HDD Total Size: 1000.2GB (3.3% used)
           ID-1: /dev/sda model: WDC_WD10JPVX size: 1000.2GB temp: 29C
Partition: ID-1: / size: 909G used: 24G (3%) fs: ext4 dev: /dev/sda2
           ID-2: swap-1 size: 8.50GB used: 0.00GB (0%) fs: swap dev: /dev/sda3
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 29.8C mobo: 27.8C gpu: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 171 Uptime: 15 min Memory: 945.4/7899.3MB
           Init: systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35 

[Jedavis1975]

I have buttons on my keyboard that I want for another purpose, like the calculator and mute.
In your case, have you tried to use the custom hot key settings? I had an old keyboard that required me to set it up to use it.

In Control Center > Keyboard Shortcuts.

Select what you want and hit the button. You may find that they may be tied to another use, this will fix that too.

[Hoser Rob]

I've had similar issues before, and sometimes going into settings > keyboard and finding an entry in the hardware list that matches your make/model the best will fix things.