Avoid segfault on TV signal format change with ThinkPad T23

Fix segfaults seen on IBM ThinkPad T23 when changing TV signal format.
Thanks to the upstream author, Tim Roberts, for help in creating this patch.

1 files changed, 4 insertions, 0 deletions

diff --git a/s3switch.c b/s3switch.c
index 5fca31a..b4c5491 100644
--- a/s3switch.c
+++ b/s3switch.c
@@ -102,8 +102,12 @@ IOAccess( int enable )
     /* Allow or disallow access to I/O ports. */
 
     ioperm( 0x40, 4, enable );
+    ioperm( 0x4f, 1, enable );
     ioperm( 0x61, 1, enable );
+    ioperm( 0x70, 1, enable );
+    ioperm( 0x71, 1, enable );
     ioperm( 0x80, 1, enable );
+    ioperm( 0xb2, 1, enable );
     ioperm( 0x3b0, 0x30, enable );
     ioperm( 0xeb, 1, enable );
 }