Paul Gofman : win32u: Set BAD_EDID registry value for empty EDID.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 7a49ff107e2fd28d366099133eeac153da4115f7
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=7a49ff107e2fd28d366099133...

Author: Paul Gofman <pgofman(a)codeweavers.com>
Date:   Wed Mar  2 19:02:43 2022 +0300

win32u: Set BAD_EDID registry value for empty EDID.

Fixes a regression introduced by commit
548bc54bf396d74b5b928bf9be835272ddda1886.

Signed-off-by: Paul Gofman <pgofman(a)codeweavers.com>
Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard(a)winehq.org>

---

 dlls/win32u/sysparams.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index cd4ff91255e..b981faef335 100644
--- 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;
 }