Ubuntu几秒钟没有任何操作自动黑屏

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在鼠标或键盘30秒内没有做任何操作以后，显示器自动黑屏。
重新点击鼠标或键盘，屏幕唤醒。
设置中心各种设置方式都已经尝试过。无效。

$xset -q // 执行该命令

Keyboard Control:
auto repeat: on key click percent: LED mask:
XKB indicators:
: Caps Lock: off : Num Lock: on : Scroll Lock: off
: Compose: off : Kana: off : Sleep: off
: Suspend: off : Mute: off : Misc: off
: Mail: off : Charging: off : Shift Lock: off
: Group : off : Mouse Keys: off
auto repeat delay: repeat rate:
auto repeating keys: 00ffffffdffffbbf
fadfffefffedffff
9fffffffffffffff
fff7ffffffffffff
bell percent: bell pitch: bell duration:
Pointer Control:
acceleration: / threshold:
Screen Saver:
prefer blanking: yes allow exposures: yes
timeout: cycle:
Colors:
default colormap: 0x47 BlackPixel: 0x0 WhitePixel: 0xffffff
Font Path:
/usr/share/fonts/X11/misc,/usr/share/fonts/X11/Type1,built-ins
DPMS (Energy Star):
Standby: Suspend: Off:
DPMS is Enabled
Monitor is On