From 9caf93faa8f37f6c744a609f55ca6e211359c806 Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@gmx.de>
Date: Wed, 1 Aug 2012 22:56:58 +0200
Subject: vesa: timeout blank/unblank operation if it gets stuck

---
 sys/src/9/pc/vgavesa.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sys/src/9/pc/vgavesa.c b/sys/src/9/pc/vgavesa.c
index 98cd84dde..ea1f26ad3 100644
--- a/sys/src/9/pc/vgavesa.c
+++ b/sys/src/9/pc/vgavesa.c
@@ -180,10 +180,19 @@ vesaproc(void*)
 				u.bx = 0x0101;
 			else	
 				u.bx = 0x0001;
+
+			/*
+			 * dont wait forever here. some BIOS get stuck
+			 * in i/o poll loop after blank/unblank for some
+			 * reason. (Thinkpad A22p)
+			 */
+			procalarm(10000);
 			vbecall(&u);
 
 			poperror();
 		}
+		procalarm(0);
+		up->notepending = 0;
 	}
 	cclose(cmem);
 	cclose(creg);
-- 
cgit v1.2.3