The machine is my Dell Inspiron 15" 7559 Laptop. I haven't found any other problems.

Any suggestions?

Code:
root@Microknoppix:/home/knoppix# inxi -Fxz
System:    Host: Microknoppix Kernel: 4.7.9-64 x86_64 (64 bit gcc: 6.2.0)
           Desktop: N/A Distro: Debian GNU/Linux stretch/sid
Machine:   System: Dell (portable) product: Inspiron 7559 v: 1.2.2
           Mobo: Dell model: 0H0CC0 v: A00
           UEFI: Dell v: 1.2.2 date: 01/22/2017
Battery    BAT0: charge: 20.0 Wh 32.9% condition: 60.8/64.9 Wh (94%)
           model: SIMPLO Dell status: Discharging
CPU:       Quad core Intel Core i7-6700HQ (-HT-MCP-) cache: 6144 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 20747
           clock speeds: max: 2500 MHz 1: 1100 MHz 2: 1099 MHz 3: 1099 MHz
           4: 1100 MHz 5: 1099 MHz 6: 1326 MHz 7: 2600 MHz 8: 1735 MHz
Graphics:  Card-1: Intel HD Graphics 530 bus-ID: 00:02.0
           Card-2: NVIDIA GM107M [GeForce GTX 960M] bus-ID: 02:00.0
           Display Server: X.org 1.18.4 drivers: (unloaded: fbdev,vesa)
           tty size: 80x24 Advanced Data: N/A for root
Audio:     Card Intel Sunrise Point-H HD Audio
           driver: snd_hda_intel bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.7.9-64
Network:   Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: d000 bus-ID: 04:00.0
           IF: eth0 state: down mac: <filter>
           Card-2: Intel Wireless 3165 driver: iwlwifi bus-ID: 05:00.0
           IF: wlan0 state: up mac: <filter>
           Card-3: Atmel usb-ID: 001-004
           IF: null-if-id state: N/A speed: N/A duplex: N/A mac: N/A
Drives:    HDD Total Size: 1260.4GB (3.6% used)
           ID-1: /dev/sda model: MTFDDAV256MBF size: 256.1GB temp: 51C
           ID-2: /dev/sdb model: ST1000LM014 size: 1000.2GB temp: 36C
           ID-3: USB /dev/sdc model: UDisk size: 4.1GB temp: 0C
           ID-1: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/zram0
           ID-2: swap-2 size: 32.00GB used: 0.00GB (0%) fs: swap dev: /dev/sdb6
Sensors:   System Temperatures: cpu: 35.0C mobo: 27.8C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 253 Uptime: 1:48 Memory: 726.0/15915.6MB
           Init: SysVinit runlevel: 5 Gcc sys: 6.2.0
           Client: Shell (bash 4.4.01) inxi: 2.3.1 
root@Microknoppix:/home/knoppix#