[reactos] 01/01: [BLUE] Fix a visual regression introduced in bfd8a848: Don't touch INBV when resetting internal screen state during driver loading.

[Hermès Bélusca-Maïto]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=1928e170f269cd300ff86…

commit 1928e170f269cd300ff86f022d03c356251f1f57
Author:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
AuthorDate: Tue Dec 24 16:13:10 2019 +0100
Commit:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
CommitDate: Tue Dec 24 16:13:10 2019 +0100

    [BLUE] Fix a visual regression introduced in bfd8a848: Don't touch INBV when
resetting internal screen state during driver loading.
---
 drivers/setup/blue/blue.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/setup/blue/blue.c b/drivers/setup/blue/blue.c
index e9accab60e8..2558506fb53 100644
--- a/drivers/setup/blue/blue.c
+++ b/drivers/setup/blue/blue.c
@@ -279,9 +279,12 @@ ScrInbvCleanup(VOID)
     // HANDLE ThreadHandle;
 
     // ResetDisplayParametersDeviceExtension = NULL;
-    InbvNotifyDisplayOwnershipLost(NULL);
-    ScrResetDisplayParametersEx(80, 50, FALSE);
-    // or InbvAcquireDisplayOwnership(); ?
+    if (ResetDisplayParametersDeviceExtension)
+    {
+        InbvNotifyDisplayOwnershipLost(NULL);
+        ScrResetDisplayParametersEx(80, 50, FALSE);
+        // or InbvAcquireDisplayOwnership(); ?
+    }
 
 #if 0
     // TODO: Find the best way to communicate the request.
@@ -1323,9 +1326,10 @@ DriverEntry(
     Status = IoCreateSymbolicLink(&SymlinkName, &DeviceName);
     if (NT_SUCCESS(Status))
     {
-        /* By default disable the screen */
-        ResetDisplayParametersDeviceExtension = DeviceObject->DeviceExtension;
+        /* By default disable the screen (but don't touch INBV:
ResetDisplayParametersDeviceExtension is still NULL) */
         ScrResetScreen(DeviceObject->DeviceExtension, TRUE, FALSE);
+        /* Now set ResetDisplayParametersDeviceExtension to enable synchronizing with
INBV */
+        ResetDisplayParametersDeviceExtension = DeviceObject->DeviceExtension;
         DeviceObject->Flags &= ~DO_DEVICE_INITIALIZING;
     }
     else