![]() ![]() What Dell models (other than their Rugged line) have a light? The HP Z Book doesn’t have a light either. The P52 also has a light, but they have some serious QC issues and we had to go with the Dell Precision 7530’s that don’t have a light. To the one asking about the make and model I’m referring to, the Lenovo P50 is the one my daughter is using. To the people commenting about the LED consuming power: are you really serious? You know that LED uses a tiny bit of power, right? This is so interesting to see the division! I wonder if it would help / hurt a presidential candidate if they were to state whether they like the light or not? :) I am going to check out the link in this thread. I want to know when my hard drive is actively doing something without having to open task manager and look at disk and performance activity. Thats another story and one of myĪgain, disk activity light is very useful in my book. Google collects data and some day they are not going to be able to do that. I didn't like the idea my hard drive data was being read and I try and stay away from Chrome. Fan slowly calmed down, not immediate but it went back to normal where I didn't even hear it. As soon as I closed the browser, everything calmed down. I checked a little deeper and my hard disk was being read, It was Google taking over my computer.Īnd the disk activity light would have been very helpful if it wasn't for the fan screaming. I didn't have any add-ons and I keep things at startup to a minimum. I had nothing else running other than the Chrome Browser was opened. I checked task manager and CPU was at 100%. When I came back, my fan was screaming and the disk activity light was going nuts. I had a case where I opened up a Google Browser back on an older computer and got called away to do something else. Here's more information on the subject at superuser.I am with you too. If there's no support for controlling a particular LED in the kernel, then, short of writing a kernel module, there's not much you can do. Something like the above should, in theory, allow you to control those LEDs which are supported by the kernel drivers for the particular hardware. None BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid usb-gadget usb-host cpu0 cpu1 rfkill1 phy0rx phy0tx phy0assoc phy0radio phy0tpt rfkill4 AC-online BAT0-charging-or-full BAT0-charging BAT0-full BAT0-charging-blink-full-solid usb-gadget usb-host cpu0 cpu1 rfkill1 phy0rx phy0tx phy0assoc phy0radio phy0tpt rfkill4 Here's what I tried, without effect: # cd /sys/class/leds/īrightness device max_brightness power subsystem trigger uevent I've also experimented on a couple of laptops, and, while there were a few entries under /sys/class/leds/, I wasn't able to control the status of LEDs, which means, I think, that the particular kernel driver does not allow manually controlling the LEDs, providing a read-only interface. For example, my desktop machine has a few LEDs but none of them seem to be controllable. Whether a particular LED can be controlled programmatically or not depends on the particular hardware. The ones which can be controlled can be accessed via the sysfs virtual filesystem at /sys/class/leds/. ![]() Some of the LEDs are hardware-only and there's no way to change their status programmatically. ![]()
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