diff --git a/TODO b/TODO
index d838242e..2302dfa4 100644
--- a/TODO
+++ b/TODO
@@ -1,5 +1,9 @@
 Many, many things. Most notably:
 
+* Check whether the FAN count divisors in the lm78 module are correct
+  (probably not!)
+* Wouldn't it be better to display all natural voltages for the LM78 chip,
+  and do *all* conversions through a user program?
 * kmalloc with GFP_KERNEL can cause a context switch! Check whether this is
   safe everywhere it is used.
 * Support 10-bit addresses. At this moment, they are supported nowhere, except
diff --git a/kernel/chips/lm75.c b/kernel/chips/lm75.c
index c8b03e67..71d68495 100644
--- a/kernel/chips/lm75.c
+++ b/kernel/chips/lm75.c
@@ -37,8 +37,8 @@
 #define TEMP_TO_REG(val)   (((((val) + 2) / 5) << 7) & 0xff80)
 
 /* Initial values */
-#define LM75_INIT_TEMP_OS 60
-#define LM75_INIT_TEMP_HYST 50
+#define LM75_INIT_TEMP_OS 600
+#define LM75_INIT_TEMP_HYST 500
 
 /* Each client has this additional data */
 struct lm75_data {
@@ -170,8 +170,10 @@ int lm75_attach_adapter(struct i2c_adapter *adapter)
     err = 0;
 
     /* Initialize the LM75 chip */
-    lm75_write_value(new_client,LM75_REG_TEMP_OS,LM75_INIT_TEMP_OS);
-    lm75_write_value(new_client,LM75_REG_TEMP_HYST,LM75_INIT_TEMP_HYST);
+    lm75_write_value(new_client,LM75_REG_TEMP_OS,
+                     TEMP_TO_REG(LM75_INIT_TEMP_OS));
+    lm75_write_value(new_client,LM75_REG_TEMP_HYST,
+                     TEMP_TO_REG(LM75_INIT_TEMP_HYST));
     lm75_write_value(new_client,LM75_REG_CONF,0);
 
     continue;
diff --git a/kernel/chips/lm78.c b/kernel/chips/lm78.c
index e20db28b..2c3036ba 100644
--- a/kernel/chips/lm78.c
+++ b/kernel/chips/lm78.c
@@ -63,18 +63,17 @@
 #define LM78_REG_CHIPID 0x49
 
 
-/* Conversions */
+/* Conversions. Rounding is only done on the TO_REG variants. */
 static int lm78_in_conv[7] = {10000, 10000, 10000, 16892, 38000, 
                               -34768, -15050 };
 #define IN_TO_REG(val,nr) (((((val) * 100000 / lm78_in_conv[nr]) + 8) / 16) \
                            & 0xff)
 #define IN_FROM_REG(val,nr) (((val) *  16 * lm78_in_conv[nr]) / 100000)
 
-#define FAN_TO_REG(val) ((((val)==0)?255:((1350000+(val))/((val)*2))) & 0xff)
-#define FAN_FROM_REG(val) (((val)==0)?-1:\
-                           ((val)==255)?0:(1350000 + (val))/((val)*2))
+#define FAN_TO_REG(val) ((val)==0?255:((1350000+(val))/((val)*2)) & 0xff)
+#define FAN_FROM_REG(val) ((val)==0?-1:(val)==255?0:1350000/((val)*2))
 
-#define TEMP_TO_REG(val) (((val)<0?(val/10)&0xff:(val/10)) & 0xff)
+#define TEMP_TO_REG(val) (((val)<0?(((val)-5)/10)&0xff:((val)+5)/10) & 0xff)
 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*10)
 
 #define VID_FROM_REG(val) ((val)==0x1f?0:(val)>=0x10?510-(val)*10:\
diff --git a/src/lm75.c b/src/lm75.c
index c8b03e67..71d68495 100644
--- a/src/lm75.c
+++ b/src/lm75.c
@@ -37,8 +37,8 @@
 #define TEMP_TO_REG(val)   (((((val) + 2) / 5) << 7) & 0xff80)
 
 /* Initial values */
-#define LM75_INIT_TEMP_OS 60
-#define LM75_INIT_TEMP_HYST 50
+#define LM75_INIT_TEMP_OS 600
+#define LM75_INIT_TEMP_HYST 500
 
 /* Each client has this additional data */
 struct lm75_data {
@@ -170,8 +170,10 @@ int lm75_attach_adapter(struct i2c_adapter *adapter)
     err = 0;
 
     /* Initialize the LM75 chip */
-    lm75_write_value(new_client,LM75_REG_TEMP_OS,LM75_INIT_TEMP_OS);
-    lm75_write_value(new_client,LM75_REG_TEMP_HYST,LM75_INIT_TEMP_HYST);
+    lm75_write_value(new_client,LM75_REG_TEMP_OS,
+                     TEMP_TO_REG(LM75_INIT_TEMP_OS));
+    lm75_write_value(new_client,LM75_REG_TEMP_HYST,
+                     TEMP_TO_REG(LM75_INIT_TEMP_HYST));
     lm75_write_value(new_client,LM75_REG_CONF,0);
 
     continue;
diff --git a/src/lm78.c b/src/lm78.c
index e20db28b..2c3036ba 100644
--- a/src/lm78.c
+++ b/src/lm78.c
@@ -63,18 +63,17 @@
 #define LM78_REG_CHIPID 0x49
 
 
-/* Conversions */
+/* Conversions. Rounding is only done on the TO_REG variants. */
 static int lm78_in_conv[7] = {10000, 10000, 10000, 16892, 38000, 
                               -34768, -15050 };
 #define IN_TO_REG(val,nr) (((((val) * 100000 / lm78_in_conv[nr]) + 8) / 16) \
                            & 0xff)
 #define IN_FROM_REG(val,nr) (((val) *  16 * lm78_in_conv[nr]) / 100000)
 
-#define FAN_TO_REG(val) ((((val)==0)?255:((1350000+(val))/((val)*2))) & 0xff)
-#define FAN_FROM_REG(val) (((val)==0)?-1:\
-                           ((val)==255)?0:(1350000 + (val))/((val)*2))
+#define FAN_TO_REG(val) ((val)==0?255:((1350000+(val))/((val)*2)) & 0xff)
+#define FAN_FROM_REG(val) ((val)==0?-1:(val)==255?0:1350000/((val)*2))
 
-#define TEMP_TO_REG(val) (((val)<0?(val/10)&0xff:(val/10)) & 0xff)
+#define TEMP_TO_REG(val) (((val)<0?(((val)-5)/10)&0xff:((val)+5)/10) & 0xff)
 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*10)
 
 #define VID_FROM_REG(val) ((val)==0x1f?0:(val)>=0x10?510-(val)*10:\