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[VIDEOPRT] Write monitor EDID to registry

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This will be used later by win32k to give only valid display modes
to user mode.
This commit is contained in:
Hervé Poussineau
2025-03-28 23:01:10 +01:00
parent 177cbd81af
commit cfde03ec9b
1 changed files with 18 additions and 0 deletions
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18
win32ss/drivers/videoprt/child.c
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@@ -121,6 +121,8 @@ IntVideoPortChildQueryId(
{
PWCHAR Buffer = NULL, StaticBuffer;
UNICODE_STRING UnicodeStr;
HANDLE hKey;
NTSTATUS Status;
switch (IrpSp->Parameters.QueryId.IdType)
{
@@ -197,6 +199,22 @@ IntVideoPortChildQueryId(
/* Add the second null terminator */
Buffer[wcslen(StaticBuffer) + 1] = UNICODE_NULL;
}
/* Try to write EDID to registry (ignore errors) */
Status = IoOpenDeviceRegistryKey(ChildExtension->PhysicalDeviceObject,
PLUGPLAY_REGKEY_DEVICE,
MAXIMUM_ALLOWED,
&hKey);
if (NT_SUCCESS(Status))
{
Status = RtlWriteRegistryValue(RTL_REGISTRY_HANDLE,
hKey,
ChildExtension->EdidValid ? L"EDID" : L"BAD_EDID",
REG_BINARY,
ChildExtension->ChildDescriptor,
sizeof(ChildExtension->ChildDescriptor));
ZwClose(hKey);
}
break;
default:
ASSERT(FALSE);