Hi project-repo, some additional information and comments.

The session error also occurs when switching inputs via the monitor menu, eg. cagebreak is connected to the monitor's HDMI port and the monitor also has a VGA input. Switching the monitor to VGA and then back to HDMI will cause the same cagebreak session disconnect as just powering the monitor off and back on.

This is especially problematic in my desktop usage as I use the different inputs on my monitors for various things like connecting my work laptop and working on projects (eg. raspberry pi etc.). If I understand your proposed behavior outlined in the previous comment, in my two monitor desk setup, every time I switch one monitor to a secondary monitor input, my cagebreak views would all move to the remaining active output/monitor? Currently with X (herbstluftwm) I can toggle inputs with no change in window layout, which is my preferred behavior.

I think it would be good if cagebreak just did nothing when outputs come and go. Perhaps a "panic" keybind could bring all views to workspace 1 in full screen when needed?

Below is some debug info when turning power off and then on in a single monitor configuration. Note that the segfault occurs immediately on power on (not on power off). The dmesg log with drm debug info is quite verbose and I just provided a snip from it which shows the cagebreak segfault at [ 5147.124848] and some context before and after.

Thread 1 "cagebreak" received signal SIGSEGV, Segmentation fault.
0x0000555555568188 in view_is_visible (view=view@entry=0xfffffffffffffff0) at ../view.c:66
66      in ../view.c
(gdb) bt
#0  0x0000555555568188 in view_is_visible (view=view@entry=0xfffffffffffffff0) at ../view.c:66
#1  0x00005555555681e5 in view_get_prev_view (view=view@entry=0x7fffeb700890) at ../view.c:39
#2  0x0000555555568317 in view_unmap (view=0x7fffeb700890) at ../view.c:120
#3  0x00007ffff7f53bd5 in wl_signal_emit_mutable () from /usr/lib/libwayland-server.so.0
#4  0x00007ffff7ed528f in unmap_xdg_surface (surface=surface@entry=0x7fffead49910) at ../types/xdg_shell/wlr_xdg_surface.c:36
#5  0x00007ffff7ed5490 in reset_xdg_surface (surface=surface@entry=0x7fffead49910) at ../types/xdg_shell/wlr_xdg_surface.c:399
#6  0x00007ffff7ed558e in xdg_surface_role_destroy (wlr_surface=<optimized out>) at ../types/xdg_shell/wlr_xdg_surface.c:332
#7  0x00007ffff7ed300b in wlr_surface_destroy_role_object (surface=0x7fffe9ea62b0) at ../types/wlr_compositor.c:742
#8  0x00007ffff7ed30c7 in xdg_client_handle_resource_destroy (resource=<optimized out>) at ../types/xdg_shell/wlr_xdg_shell.c:70
#9  0x00007ffff7f54e60 in ?? () from /usr/lib/libwayland-server.so.0
#10 0x00007ffff7f51ac0 in ?? () from /usr/lib/libwayland-server.so.0
#11 0x00007ffff7f55329 in wl_client_destroy () from /usr/lib/libwayland-server.so.0
#12 0x00007ffff7f554b2 in wl_display_destroy_clients () from /usr/lib/libwayland-server.so.0
#13 0x000055555555e300 in main (argc=<optimized out>, argv=<optimized out>) at ../cagebreak.c:690

[ 5147.122317] [drm:__drm_atomic_state_free [drm]] Freeing atomic state 00000000e9cdd5dc                                                                                                       
[ 5147.122431] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_DESTROYPROPBLOB                                                                           
[ 5147.122515] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 279 (2)                                                                                                                        
[ 5147.122599] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 279 (1)                                                                                                                        
[ 5147.122702] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_RMFB                                                             
[ 5147.122781] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 278 (2)                                                                                                                          
[ 5147.122863] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 278 (1)                                                                                                                        
[ 5147.123018] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_RMFB                                                                                      
[ 5147.123099] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 275 (2)                                                                                                                        
[ 5147.123180] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 275 (1)                                                                                               
[ 5147.123322] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_GETCONNECTOR                                                                                
[ 5147.123405] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:266:DP-3]                                                                                           
[ 5147.123463] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:266:DP-3]                                                                                                          
[ 5147.123699] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:266:DP-3] disconnected                                                                              
[ 5147.123754] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 266 (2)                                                                                               
[ 5147.123851] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_GETCONNECTOR                                                                                
[ 5147.123938] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 266 (2)                                                                                                                        
[ 5147.124030] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_GETCONNECTOR                                                                              
[ 5147.124107] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:272:HDMI-A-3]                                                                                        
[ 5147.124160] i915 0000:00:02.0: [drm:intel_hdmi_detect [i915]] [CONNECTOR:272:HDMI-A-3]                                                                           
[ 5147.124384] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]] [CONNECTOR:272:HDMI-A-3] disconnected                                                                            
[ 5147.124435] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 272 (2)                                                                                                                        
[ 5147.124526] [drm:drm_ioctl [drm]] comm="cagebreak" pid=2855, dev=0xe201, auth=1, DRM_IOCTL_MODE_GETCONNECTOR                                                                              
[ 5147.124609] [drm:drm_mode_object_put.part.0 [drm]] OBJ ID: 272 (2)                                                                                                                        
[ 5147.124848] cagebreak[2855]: segfault at 30 ip 000055a259eb0188 sp 00007ffdd0b63970 error 4 in cagebreak[55a259ea4000+f000]                                      
[ 5147.124879] Code: e8 dd 47 ff ff 48 81 c4 d8 00 00 00 c3 48 8b 47 48 ff 60 10 48 8b 47 28 48 85 c0 74 08 48 39 78 18 74 02 31 c0 c3 48 83 ec 18 <83> 7f 40 01 74 0d e8 df ff ff ff 48 85 c0 
[ 5147.135130] [drm:drm_file_free.part.0 [drm]] comm="cagebreak", pid=2855, dev=0xe280, open_count=4                                                                                         
[ 5147.135263] [drm:drm_file_free.part.0 [drm]] comm="cagebreak", pid=2855, dev=0xe280, open_count=3                                                                                         
[ 5147.135353] [drm:drm_file_free.part.0 [drm]] comm="cagebreak", pid=2855, dev=0xe280, open_count=2                                                                                         
[ 5147.287037] i915 0000:00:02.0: [drm:gen8_de_irq_handler.isra.0 [i915]] hotplug event received, stat 0x00040000, dig 0x00000a88, pins 0x00000040, long 0x00000040 
[ 5147.287237] i915 0000:00:02.0: [drm:intel_hpd_irq_handler [i915]] digital hpd on [ENCODER:255:DDI C (TC)/PHY C] - long                                                                      
[ 5147.287469] i915 0000:00:02.0: [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 6 - cnt: 20                                                                               
[ 5147.287734] i915 0000:00:02.0: [drm:intel_dp_hpd_pulse [i915]] got hpd irq on [ENCODER:255:DDI C (TC)/PHY C] - long                                                                       
[ 5147.287998] i915 0000:00:02.0: [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions                                                                                      
[ 5147.288256] i915 0000:00:02.0: [drm:i915_hotplug_work_func [i915]] Connector DP-2 (pin 6) received hotplug event. (retry 0)                                     
[ 5147.288465] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:256:DP-2]                                                                                                            
[ 5147.288688] i915 0000:00:02.0: [drm:__intel_display_power_get_domain.part.0 [i915]] enabling AUX C TC1

Session error upon turning off an output #38

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