安装了manjaro (arch 系)，桌面是xfce。记得刚装好时锁屏还正常的，结果更新后锁屏解锁时屏幕背光会关掉，切tty也无济于事，只能试着ctrl alt del或ctrl alt backspace。搜了一下貌似是 xfce默认锁屏程序light-locker的问题？但是之前似乎并没有问题的。官方论坛讨论并无下文，但是在xubuntu讨论区和launchpad等见到了一些讨论。难道只能换掉锁屏程序，感觉其他的 xscreensaver, gnome-screensaver 之类的都挺难看的。
https://forum.manjaro.org/index.php?topic=23961.0
https://forum.manjaro.org/index.php?topic=22911.0
https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-settings/+bug/1303736
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1259339
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1357090
https://github.com/the-cavalry/light-locker/issues/61
https://forum.manjaro.org/index.php?topic=23961.0
https://forum.manjaro.org/index.php?topic=22911.0
https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-settings/+bug/1303736
https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1259339
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1357090
https://github.com/the-cavalry/light-locker/issues/61
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