[Spice-devel] [PATCH] qxl-wddm-dod: Fix for screen not shown after driver disabled

[Yuri Benditovich]

https://bugzilla.redhat.com/show_bug.cgi?id=1411340
Do not set SupportNonVGA field for device rev.4 and higher.
Then the class driver will not call miniport's procedure
StopDeviceAndReleasePostDisplayOwnership upon PnP stop.
QXL device modes are not compatible with VGA ones; the
driver in this procedure returns display information related
to QXL mode which later used by BasicDisplay driver and causes
it to show the screen incorrectly or fail to show it at all.

Signed-off-by: Yuri Benditovich <yuri.benditovich at daynix.com>
---
 qxldod/QxlDod.cpp | 2 +-
 qxldod/QxlDod.h   | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/qxldod/QxlDod.cpp b/qxldod/QxlDod.cpp
index 7adbec4..001cd67 100755
--- a/qxldod/QxlDod.cpp
+++ b/qxldod/QxlDod.cpp
@@ -411,7 +411,7 @@ NTSTATUS QxlDod::QueryAdapterInfo(_In_ CONST DXGKARG_QUERYADAPTERINFO* pQueryAda
             pDriverCaps->PointerCaps.Monochrome = 1;
             pDriverCaps->PointerCaps.Color = 1;
 
-            pDriverCaps->SupportNonVGA = TRUE;
+            pDriverCaps->SupportNonVGA = m_pHWDevice->IsBIOSCompatible();
 
             DbgPrint(TRACE_LEVEL_VERBOSE, ("<--- %s 1\n", __FUNCTION__));
             return STATUS_SUCCESS;
diff --git a/qxldod/QxlDod.h b/qxldod/QxlDod.h
index 4df4c61..8df1fcf 100755
--- a/qxldod/QxlDod.h
+++ b/qxldod/QxlDod.h
@@ -263,6 +263,7 @@ public:
     virtual NTSTATUS Escape(_In_ CONST DXGKARG_ESCAPE* pEscap) = 0;
     NTSTATUS AcquireDisplayInfo(DXGK_DISPLAY_INFORMATION& DispInfo);
     ULONG GetId(void) { return m_Id; }
+    virtual BOOLEAN IsBIOSCompatible() { return TRUE; }
 protected:
     virtual NTSTATUS GetModeList(DXGK_DISPLAY_INFORMATION* pDispInfo) = 0;
 protected:
@@ -480,6 +481,7 @@ public:
     NTSTATUS SetPointerShape(_In_ CONST DXGKARG_SETPOINTERSHAPE* pSetPointerShape);
     NTSTATUS SetPointerPosition(_In_ CONST DXGKARG_SETPOINTERPOSITION* pSetPointerPosition);
     NTSTATUS Escape(_In_ CONST DXGKARG_ESCAPE* pEscap);
+    BOOLEAN IsBIOSCompatible() { return FALSE; }
 protected:
     NTSTATUS GetModeList(DXGK_DISPLAY_INFORMATION* pDispInfo);
     VOID BltBits (BLT_INFO* pDst,
-- 
2.7.0.windows.1