Hardware :: USB Device Voltage Cut Off?
Aug 3, 2010
I'm using RHEL5 and checking USB devices. Now what I'm trying is to cut off (turn off) the voltage supplied to USB device.
Quote:
# uname -r
2.6.29.6.99.custom.22122009
# cd /sys/bus/usb/devices/2-1/power
# ls
active_duration autosuspend connected_duration level wakeup
# echo "suspend" > level
But, it's not possible to turn off the power of USB devices, although e.g. only iPod was released from the USB device by this commands.
Is there a ways to directly turn off the voltage of USB dev on linux?
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Sep 26, 2010
I am doing a project on how power consumption of a CPU can be improved by underclocking the lower P-states and overclocking the highest p-state.In this way you can increase both the performance of the chip and it's average power usage (assuming you don't run the chip at 100% 24/7).
To do this project I need to be able to change the voltage and frequency of the chip for all of the different p-states of the chip. On Windows I can use k10stat, RMClock or AMD Overdrive.
What can I use in Linux? I found k10ctl, but it always complained about not being able to find /dev/cpu/0, so I looked in /dev and noticed that their isn't even a cpu directory in there!
I have a moderate amount of experience so I don't mind changing kernels or doing other hard tasks to get this to work.
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Jan 13, 2011
GKrellM worked fine under 9.04.W/ 10.04 it works but does not sense the Fan or Voltage sensors.I transplanted the old folder over to /home after downloading GKrellM, hddtemp, and lm-sensors thru Synaptic.Ran the hddtemp and lm sensors in terminal w/ no problems.Running sensors revealed all inputs: cpu temps, fan speeds, andmobo voltages.GKrellM downloaded was ver 2.3.4 while my old folder data was 2.3.2. Sensor config file is same format just that the old config file has all the voltage/fan pointers assigned as well.
Weird thing is that GKrellM will overwrite the sensor-config file (that has ALL the sensor defined inputs pasted into it) after going into the program and selecting Configuration. It reverts to the sensor-config file created after running lm-sensors and hddtemp under 10.04.So it's autowriting itself and not picking up the fan/voltage inputs.Displaying the data thru the Sensor Applet in the Desktop panel is OK but I prefer having everything on GKrellM. It's a much cleaner, easy to view system. Anybody got a clue why GKrellM is overwriting the sensor-config file. That should be static, unlike the user-config file.
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Apr 4, 2011
I'm looking for any power monitoring devices for Linux to allow monitoring power quality, voltage changes, and outages. This would be for North American three phase power system. I want to have this data fed live to my own program. It should be something much better than just jury-rigging a circuit to fee the power waveform into 2 or 3 audio cards.
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May 15, 2011
Recently, I created a device sc0 through device mapper. The divice could be found in /dev/mapper/sc0. My problem is that the device doesn't exist in /dev/partitions which will block my following test.BTW, I found dm-0 in /dev/partitions. Is it the same as /dev/mapper/sc0? But the device /dev/dm-0 doesn't exist!
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Apr 7, 2011
I am working on an embedded system, which is an USB MSC device that supports some vendor specific scsi commands. I am using FC10 laptop as USB host for testing, and it runs some small apps based on sg3. All has been well for ~ a week. The FC10 laptop is able to communicate with the device and retrieve data. Suddenly, starting from today, the laptop is not able to properly detect the device. When plugged-in, the MSC device is detected as input device (I thought). This is observed from "dmesg" output and changes in "/dev/input/".The device under development is running at full speed. When I connect to winXP, no problem. A windows file explorer pops up, showing the content of the drive.Also, the FC10 has no problem with other USB flash drive (high speed).
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Jun 11, 2011
I rebooted my server and out of nowhere the RAID5 array won't assemble. I've tried everything I could think of to reassemble the thing. I fear that the array is ruined, but I can't imagine how. Here are various bits of information: The simplest failure (with and without partition numbers, which have not been needed in the past):
Code:
richard@nas:~$ sudo mdadm --assemble --verbose /dev/md0 /dev/sd[bcd]
mdadm: looking for devices for /dev/md0
mdadm: cannot open device /dev/sdb: Device or resource busy
[code]...
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Mar 11, 2010
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Aug 23, 2011
I've bought an X10 Home Automation USB interface: the CM15.
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But this tells me nothing about where the device file is! How can I find that, or create one myself?
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May 24, 2011
the message from dmesg for the IrDA device:
[ 3635.194162] usb 3-1: new full speed USB device using uhci_hcd and address 2
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[ 3635.338165] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[code]...
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Jan 7, 2010
here we have an older digicam (Jenoptik/Exakta Model "DC 22", if someone might want to know) that can be switched between some "PC Camera mode" and "Mass storage mode".Unfortunately, if attached to USB, it is always recognized as
Code:
UDEV [1262910483.475886] add /class/video4linux/video0 (video4linux)
lsusb tells:
[code]...
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Sep 19, 2009
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Nov 10, 2010
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Sep 26, 2010
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[Code]....
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[Code]....
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Aug 14, 2009
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Code:
00:00.0 Host bridge: Intel Corporation 82845 845 [Brookdale] Chipset Host Bridge (rev 11)
00:01.0 PCI bridge: Intel Corporation 82845 845 [Brookdale] Chipset AGP Bridge (rev 11)
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00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI [Code].....
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Jun 9, 2011
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May 3, 2009
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Mar 21, 2010
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Mar 19, 2011
Flash is having really trouble in firefox, it works in chrome on the other hand.You can see the large white boxes that randomly appear while flash plays.Thunderbird's lightning fails to install and gives this error.
System Spec's
OpenSuse 11.4 64bit
Intel i3 CPU and Graphic's
4 GB of ram
Webcam (working)
[code]....
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Boot Info Script 0.55 dated February 15th, 2010
============================ Boot Info Summary: ==============================
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[code]....
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