[Spice-devel] [win32/vd_agent v2 3/3] make display disconnection persistent

[Yuri Benditovich]

https://bugzilla.redhat.com/show_bug.cgi?id=1477191
Currently on Win10 when one of multiple displays is
disconnected by the client, the qxl-wddm-dod driver
does not receive any update, the system just stops using
this adapter for rendering. As a result, the 'disconnected'
state of the adapter is not saved anywhere. On further
connect the client side recognize the adapter as active
and opens window for it. Current commit fixes the problem
by sending QXL_ESCAPE_MONITOR_CONFIG with zero area
to disabled adapter.

Signed-off-by: Yuri Benditovich <yuri.benditovich at daynix.com>
---
 vdagent/display_configuration.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vdagent/display_configuration.cpp b/vdagent/display_configuration.cpp
index 420836b..f0fbb77 100644
--- a/vdagent/display_configuration.cpp
+++ b/vdagent/display_configuration.cpp
@@ -440,7 +440,10 @@ bool WDDMInterface::is_attached(DISPLAY_DEVICE* dev_info)
 
 bool WDDMInterface::set_monitor_state(LPCTSTR device_name, DEVMODE* dev_mode, MONITOR_STATE state)
 {
-   return  _ccd.set_path_state(device_name, state);
+    if (_ccd.is_attached(device_name) && state == MONITOR_DETACHED) {
+        turn_monitor_off(device_name);
+    }
+    return  _ccd.set_path_state(device_name, state);
 }
 
 bool WDDMInterface::custom_display_escape(LPCTSTR device_name, DEVMODE* dev_mode)
-- 
2.16.1.windows.4