tw1965 在另外的主題有提到：

Antenna (RF) -> Tuner (IF) -> Demod (TS) ->

If the RF strength can not be measured by Tuner (such as XC3028, XC4000, ..., etc.),
"Signal Strength" is the IF strength which is measured by Demod (such as TDA10046, TDA10048, CE6353, ZL10353, MT353, ..., etc.).
The IF signal is amplified by Tuner (such as TDA18271, TDA18211, XC3028, XC4000, XC5000, ..., etc.).
And the driver may
return the IF strength measured by Demod or
return the "Signal Quality" (Quality measured by Demod).

據本半桶水山人的翻譯與理解, 大意是說...

如果 Tuner 無法測量 RF 的強度, 回傳的 Signal Strength
值就會是 Demodulator 量測出來的. 不過因為 Tuner 會把
IF 訊號的強度先調整到適當的範圍再丟給 Demodulator,
所以這時候我們看到的 Signal Strength 跟 Signal Quality
就比較沒參考價值了...

所以這跟驅動程式比較無關, 跟 Tuner 比較有關這樣.

hmm 所以還是看 Error 數值比較準這樣.