我在通过 HDMI 连接外部显示器时遇到问题。屏幕闪烁得非常厉害，突然亮起和熄灭（无信号），有时只是一片空白。我为我的显卡使用了推荐的 nvidia-driver-390。我的笔记本电脑是 HP ProBook 470 G4。我进行的一些诊断的输出：
sudo lshw -c 视频
*-display
description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 02
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: iomemory:1f0-1ef iomemory:1f0-1ef irq:128 memory:1ff0000000-1ff0ffffff memory:1fe0000000-1fefffffff ioport:5000(size=64) memory:c0000-dffff
*-display
description: 3D controller
product: GM108M [GeForce 930MX]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a2
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=nvidia latency=0
resources: irq:129 memory:d2000000-d2ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:4000(size=128)
兰德
HDMI-1-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 75.02 60.02
1280x800 59.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
832x624 74.55
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
我还在系统日志中发现了一些有趣的消息
Aug 4 07:46:39 podlomar-HP-ProBook-470-G4 /usr/lib/gdm3/gdm-x-session[1175]: (--) modeset(G0): HDMI max TMDS frequency 300000KHz
Aug 4 07:46:39 podlomar-HP-ProBook-470-G4 gnome-control-c[1830]: Config not applicable: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: The requested configuration is based on stale information
Aug 4 07:46:39 podlomar-HP-ProBook-470-G4 /usr/lib/gdm3/gdm-x-session[1175]: (--) modeset(G0): HDMI max TMDS frequency 300000KHz
Aug 4 07:47:41 podlomar-HP-ProBook-470-G4 /usr/lib/gdm3/gdm-x-session[1175]: (--) modeset(G0): HDMI max TMDS frequency 300000KHz
Aug 4 07:47:41 podlomar-HP-ProBook-470-G4 gnome-control-c[1830]: Config not applicable: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: The requested configuration is based on stale information
Aug 4 07:47:41 podlomar-HP-ProBook-470-G4 /usr/lib/gdm3/gdm-x-session[1175]: (--) modeset(G0): HDMI max TMDS frequency 300000KHz
但我不知道它们是什么意思。我已经在 xrandr 中尝试了不同的分辨率和频率，但没有任何效果。要么显示器闪烁，要么根本没有信号。我测试了两台显示器，一台是 BenQ 24 英寸全高清（日志中显示），另一台是 32 英寸 WQHD 显示器。所有显示器的表现都一样。我使用了两根不同的 HDMI 电缆，没有任何区别。