Ghost SNR check removed as asked: no bounds, no panic, no latch re-read — a raw 0x0000 in 1.133-136 decodes as no-margin-this-poll (the untrained resting value, which appears before 1.1 reports a drop, so no read ordering could prove a ghost); panel value columns bounded by scalePanelCount (4 chars forever) with RESET narrowed to 5 chars so counts can never reach the timeline; rows and heat cells stretch proportionally to fill the band between header and footer instead of leaving the bottom half dead

rollball.go

@@ -32,11 +32,6 @@ const (
 
 	rbPHYIDHi uint16 = 0x002B
 	rbPHYIDLo uint16 = 0x0BF4
-
-	// IEEE margins land near 7-9 dB on a healthy short cable; far outside is
-	// another register's data.
-	rbGhostLow  = -10.0
-	rbGhostHigh = 25.0
 )
 
 // Only the registers proven safe on this PHY (docs/modules/wiitek/): single
@@ -170,11 +165,9 @@ func (r *rollball) identify() (ident string, err error) {
 	return
 }
 
-// An untrained PHY honestly serves 0x0000 here, so an out-of-band value is
-// only a ghost if the link stayed up across the reads. The caller drained the
-// PMA 1.1 latch when it checked the link, so one latched read now answers
-// that: a drop since means the unplug race — discard the batch, ok false, and
-// the next poll reads the link down.
+// 0x0000 is the untrained PHY's resting value in these offset-0x8000
+// registers, and the margins zero out before 1.1 reports a drop — so a zero
+// read is no margin this poll, never data.
 func (r *rollball) snrMargins() (out [4]float64, ok bool, err error) {
 	r.exec(func() {
 		for i := range out {
@@ -182,19 +175,10 @@ func (r *rollball) snrMargins() (out [4]float64, ok bool, err error) {
 			if v, err = r.mdioRead(1, uint16(133+i)); err != nil {
 				return
 			}
-			m := (float64(v) - 0x8000) / 10
-			if m < rbGhostLow || m > rbGhostHigh {
-				var link uint16
-				if link, err = r.mdioRead(1, 1); err != nil {
-					return
-				}
-				if link&0x0004 == 0 {
-					return
-				}
-				panic(fmt.Sprintf("%s: ghost SNR margin %.1f dB (1.%d=%#04x) with the link up",
-					r.ifname, m, 133+i, v))
+			if v == 0 {
+				return
 			}
-			out[i] = m
+			out[i] = (float64(v) - 0x8000) / 10
 		}
 		ok = true
 	})