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vesa: timeout blank/unblank operation if it gets stuck

--- a/sys/src/9/pc/vgavesa.c

+++ b/sys/src/9/pc/vgavesa.c

@@ -180,10 +180,19 @@

 				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);