I've been running Debian 9 for a long time with this dual display setup and never had any problems. Upgraded to Debian 10 about a week ago, and immediately have this problem. xrandr info: tingo@kg-bsbox:~$ xrandr Screen 0: minimum 320 x 200, current 2400 x 1920, maximum 8192 x 8192 HDMI-1 connected primary 1200x1920+0+0 left (normal left inverted right x axis y axis) 518mm x 324mm 1920x1200 59.95*+ 1920x1080 60.00 60.00 50.00 59.94 24.00 23.98 1920x1080i 60.00 60.00 50.00 59.94 1600x1200 60.00 1280x1024 75.02 60.02 1152x864 75.00 1280x720 60.00 60.00 50.00 59.94 1024x768 75.03 60.00 800x600 75.00 60.32 720x576 50.00 50.00 720x576i 50.00 50.00 720x480 60.00 60.00 59.94 59.94 59.94 720x480i 60.00 60.00 59.94 59.94 640x480 75.00 60.00 59.94 59.94 720x400 70.08 DP-1 connected 1200x1920+1200+0 left (normal left inverted right x axis y axis) 518mm x 324mm 1920x1200 59.95*+ 1920x1080 60.00 60.00 50.00 59.94 24.00 23.98 1920x1080i 60.00 60.00 50.00 59.94 1600x1200 60.00 1280x1024 75.02 60.02 1152x864 75.00 1280x720 60.00 60.00 50.00 59.94 1024x768 75.03 60.00 800x600 75.00 60.32 720x576 50.00 50.00 720x480 60.00 60.00 59.94 59.94 59.94 640x480 75.00 60.00 59.94 59.94 720x400 70.08
The machine is an ASRock BeeBox-S 7100U. Details / workaround: pressing Ctrl-Alt-F7 gets me to the "this session is locked" screen and in a few seconds I get to the unlock screen and can give my password. (but it is annoying to have to do this many times a day). Also, the second / right display often has changed rotation back to "normal" when the bug hits, and I have to go into Settings, Display and change it back. My estimate is that about half the times I need to unlock I see the bug, the other half it works as it should reportbug output -- System Information: Debian Release: 10.0 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores) Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages xfce4 depends on: ii gtk2-engines-xfce 3.2.0-4 ii libxfce4ui-utils 4.12.1-3 ii thunar 1.8.4-1 ii xfce4-appfinder 4.12.0-2 ii xfce4-panel 4.12.2-1 ii xfce4-pulseaudio-plugin 0.4.1-1 ii xfce4-session 4.12.1-6 ii xfce4-settings 4.12.4-1 ii xfconf 4.12.1-1 ii xfdesktop4 4.12.4-2 ii xfwm4 4.12.5-1 Versions of packages xfce4 recommends: ii desktop-base 10.0.2 ii tango-icon-theme 0.8.90-7 ii thunar-volman 0.9.1-1 ii xfce4-notifyd 0.4.3-1 ii xorg 1:7.7+19 Versions of packages xfce4 suggests: pn gtk3-engines-xfce <none> ii xfce4-goodies 4.12.6 ii xfce4-power-manager 1.6.1-1 -- no debconf information -- Regards, Torfinn Ingolfsen