我有华硕 X550LD最近我安装了带有 GNOME 的 Ubuntu 18.04 LTS，后来我转到了 KDE Plasma。KDE 详细信息如下图所示：
我还使用以下命令安装了 nvidia 驱动程序：
sudo apt install nvidia-driver-390
显卡驱动程序相关详细信息：
thelittlenaruto@thelittlenaruto-X550LD:~$ sudo lshw -C display
*-display
description: VGA compatible controller
product: Haswell-ULT Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:50 memory:f7400000-f77fffff memory:d0000000-dfffffff ioport:f000(size=64) memory:c0000-dffff
*-display
description: 3D controller
product: GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:04:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:52 memory:f6000000-f6ffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:d000(size=128) memory:f7000000-f707ffff
thelittlenaruto@thelittlenaruto-X550LD:~$
以下是其中的片段/etc/default/grub：
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video nvidia-drm.modeset=1"
GRUB_CMDLINE_LINUX=""
经过这些，我的亮度按钮反应非常迟缓，大概 4-5 分钟。这意味着它不会立即反映亮度变化。有什么解决办法吗？
输出journalctl -xe：
thelittlenaruto@thelittlenaruto-X550LD:~$ journalctl -xe
May 02 05:30:58 thelittlenaruto-X550LD systemd[1]: This usually indicates unclean termination of a previous ru
May 02 05:30:58 thelittlenaruto-X550LD systemd[1]: Started Tool to automatically collect and submit kernel cra
-- Subject: Unit kerneloops.service has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit kerneloops.service has finished starting up.
--
-- The start-up result is RESULT.
May 02 05:30:58 thelittlenaruto-X550LD whoopsie[1235]: [05:30:58] Using lock path: /var/lock/whoopsie/lock
May 02 05:30:58 thelittlenaruto-X550LD nm-dispatcher[1049]: req:5 'connectivity-change': new request (1 script
May 02 05:30:59 thelittlenaruto-X550LD nm-dispatcher[1049]: req:4 'dhcp4-change' [wlp3s0]: start running order
May 02 05:30:59 thelittlenaruto-X550LD nm-dispatcher[1049]: req:5 'connectivity-change': start running ordered
May 02 05:31:00 thelittlenaruto-X550LD whoopsie[1235]: [05:31:00] offline
May 02 05:31:00 thelittlenaruto-X550LD systemd[1]: Started Message of the Day.
-- Subject: Unit motd-news.service has finished start-up
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- Unit motd-news.service has finished starting up.
--
-- The start-up result is RESULT.
lines 2340-2361/2361 (END)