在一年的大部分时间里，我一直在使用 Ubuntu Linux 来使用两个外部显示器。最近，我允许它更新 linux 库。重新启动后，两个显示器都没有出现。显示设置窗口仅显示笔记本电脑显示屏。
系统：
- 惠普 ZBook Fury 16 G9
- 乌班图22.04.3
- 内核：6.2.0-26-generic
- HDMI 集线器：VVB USB-C 集线器，目前被绕过
- 在此之前，HODO中心
xrandr -q 输出仅显示笔记本电脑显示屏：
Screen 0: minimum 16 x 16, current 1680 x 1050, maximum 32767 x 32767
XWAYLAND0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 340mm x 220mm
1680x1050 59.85*+
1400x1050 59.86
1280x1024 59.89
1280x960 59.94
1152x864 59.78
1024x768 59.68
800x600 59.86
640x480 59.38
320x240 59.52
1440x900 59.89
1280x800 59.81
720x480 59.71
640x400 59.20
320x200 58.96
1600x900 59.82
1368x768 59.88
1280x720 59.86
1024x576 59.90
864x486 59.92
720x400 59.55
640x350 59.77
我尝试过的：
- 各种重启顺序：启动时插入显示器、启动时不插入显示器、拔下单个显示器。
- 删除了 Monitors.xml（它用单个显示器重新创建了它）
- 新枢纽
- 目前有一个显示器插入内置 HDMI 端口
- 重新安装了操作系统
- 多条 HDMI 电缆
我一边抓着救命稻草，一边查看了 kern.log。重新启动显示管理器时，我得到了这个，我想知道更新的 apparmor 是否可能阻止监视器检测：
Aug 17 20:02:30 Monster kernel: [ 3298.342817] audit: type=1400 audit(1692320550.336:102): apparmor="DENIED" operation="capable" class="cap" profile="/snap/snapd/19457/usr/lib/snapd/snap-confine" pid=21365 comm="snap-confine" capability=12 capname="net_admin"
Aug 17 20:02:30 Monster kernel: [ 3298.342835] audit: type=1400 audit(1692320550.336:103): apparmor="DENIED" operation="capable" class="cap" profile="/snap/snapd/19457/usr/lib/snapd/snap-confine" pid=21365 comm="snap-confine" capability=38 capname="perfmon"
Aug 17 20:02:30 Monster kernel: [ 3298.348602] rfkill: input handler disabled
Aug 17 20:02:30 Monster kernel: [ 3299.001174] audit: type=1107 audit(1692320550.992:104): pid=802 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/org/freedesktop/PolicyKit1/Authority" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.7" pid=21365 label="snap.snap-store.ubuntu-software" peer_pid=814 peer_label="unconfined"
Aug 17 20:02:30 Monster kernel: [ 3299.001174] exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
Aug 17 20:02:30 Monster kernel: [ 3299.001311] audit: type=1107 audit(1692320550.992:105): pid=802 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/org/freedesktop/PolicyKit1/Authority" interface="org.freedesktop.PolicyKit1.Authority" member="CheckAuthorization" mask="send" name=":1.7" pid=21365 label="snap.snap-store.ubuntu-software" peer_pid=814 peer_label="unconfined"
Aug 17 20:02:30 Monster kernel: [ 3299.001311] exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
Aug 17 20:02:31 Monster kernel: [ 3299.002502] audit: type=1107 audit(1692320550.996:106): pid=802 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/org/freedesktop/PolicyKit1/Authority" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.7" pid=21365 label="snap.snap-store.ubuntu-software" peer_pid=814 peer_label="unconfined"
Aug 17 20:02:31 Monster kernel: [ 3299.002502] exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
Aug 17 20:02:31 Monster kernel: [ 3299.002611] audit: type=1107 audit(1692320550.996:107): pid=802 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call" bus="system" path="/org/freedesktop/PolicyKit1/Authority" interface="org.freedesktop.PolicyKit1.Authority" member="CheckAuthorization" mask="send" name=":1.7" pid=21365 label="snap.snap-store.ubuntu-software" peer_pid=814 peer_label="unconfined"
Aug 17 20:02:31 Monster kernel: [ 3299.002611] exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
Aug 17 20:02:31 Monster kernel: [ 3299.139272] audit: type=1400 audit(1692320551.132:108): apparmor="DENIED" operation="open" class="file" profile="snap.snap-store.ubuntu-software" name="/etc/appstream.conf" pid=21365 comm="snap-store" requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Aug 17 20:02:34 Monster kernel: [ 3302.954111] audit: type=1326 audit(1692320554.948:109): auid=1000 uid=1000 gid=1000 ses=2 subj=snap.snap-store.ubuntu-software pid=21365 comm="pool-org.gnome." exe="/snap/snap-store/959/usr/bin/snap-store" sig=0 arch=c000003e syscall=93 compat=0 ip=0x7f59aff94c4b code=0x50000
答案1
好吧，据我所知，Ubuntu 更新不包括与其配合使用的 Nvidia 驱动程序。我重新安装了 Nvidia 驱动程序，然后就可以正常运行了。