The driver is mv643xx and the ports have two LEDs: an amber activity LED on the left and a green link status LED on the right. With the 4.4 kernel, the green LED would turn on all the time (I think) and amber would flash on when data was sent or received … •2/6
Upgraded the Linux kernel on one of my (ARM-based) machines from 4.4.210 to 4.9.210 and all worked well except for one very minor but very intriguing change: the activity LED on the RJ45 Ethernet ports no longer works (the ports themselves work fine). How can that be‽ •1/6
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… whereas now with 4.9, the green LED is on and flashes off upon link activity and the amber LED is (apparently) constantly off. Could be a simple change in the driver but I could find no significant change in mv643xx_eth.c — HOW IS THIS POSSIBLE? •3/6
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I tried ethtool but it shows exactly the same output on both kernels. Link is up, full-duplex 1000Mbps. Only the (amber) LED seems to have stopped working. •4/6
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I thought maybe these LEDs were brought into general kernel LED-class control, but nope: /sys/class/leds does not show anything relating to them. It's a very minor thing, but it's extremely mysterious how such a change could happen! •5/6
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On a related note, for other kinds of LEDs, the value of /sys/class/leds/$LED/duration (when trigger==transient) was apparently counted in centiseconds on kernel 4.4 and is now in milliseconds. Also very mysterious! Why the change? Probably unrelated, but who knows? •6/6
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git bisect?
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In principle I could do that, yes, but since it takes so long to prepare a new kernel, set it up, boot it and actually check whether the LEDs work, it would mean making the machine unusable for days, which I can't really afford.
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Čini se da učitavanje traje već neko vrijeme.
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