win32u: Set BAD_EDID registry value for empty EDID.

Fixes a regression introduced by commit 548bc54b. Signed-off-by: Paul Gofman <pgofman@codeweavers.com> Signed-off-by: Jacek Caban <jacek@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

win32u: Set BAD_EDID registry value for empty EDID.
7a49ff10 · Paul Gofman · Alexandre Julliard · 2934ce5c · 7a49ff10
Commit 7a49ff10 authored Mar 02, 2022 by Paul Gofman Committed by Alexandre Julliard Mar 02, 2022
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sysparams.c dlls/win32u/sysparams.c +6 -2

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--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -1120,8 +1120,13 @@ static void add_monitor( const struct gdi_monitor *monitor, void *param )

    if ((subkey = reg_create_key( hkey, device_parametersW, sizeof(device_parametersW), 0, NULL )))
    {
+        static const WCHAR bad_edidW[] = {'B','A','D','_','E','D','I','D',0};
        static const WCHAR edidW[] = {'E','D','I','D',0};
-        set_reg_value( subkey, edidW, REG_BINARY, monitor->edid, monitor->edid_len );
+
+        if (monitor->edid_len)
+            set_reg_value( subkey, edidW, REG_BINARY, monitor->edid, monitor->edid_len );
+        else
+            set_reg_value( subkey, bad_edidW, REG_BINARY, NULL, 0 );
        NtClose( subkey );
    }

@@ -1327,7 +1332,6 @@ static BOOL update_display_cache(void)
        ERR( "failed to read display config\n" );
        return FALSE;
    }
-
    return TRUE;
 }