Problem with detecting USB devices.. something abt ehci-hcd??

Hi All,
I have a DELL E6410 laptop. I have a problem with connecting USB devices.
Whenever a power event (such as connecting/disconnecting of AC adaptor) happens, my laptop stops detecting any USB devices and any changes that happen on the USB ports. That is, say an external mouse is connected to the laptop, the mouse stops functioning, and if I connect a mouse/USB_stick or any such thing to the computer, the device is not detected.
dmesg output show that any connecting/disconnecting events are not detected by the computer. lsusb output too shows the same thing.
To solve the problem, I need to rmmod the module ehci-hcd and modprobe it back. That is, I have to run the commands rmmod ehci-hcd followed by modprobe ehci-hcd. Then, this problem goes away until the next power event happens.
This event does not happen all the time, but it happens very regularly.
Here are the kernel and laptop specs..
uname -a
Linux myhost 3.0-ARCH #1 SMP PREEMPT Tue Aug 30 08:53:25 CEST 2011 x86_64 Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz GenuineIntel GNU/Linux
Kindly help me on this issue.
Thanks

This is the output of kernel.log when I unplug my AC adaptor with the external USB mouse connected.
Sep 12 11:18:33 localh ost kernel: [ 591.015557] EXT4-fs (sda6): re-mounted. Opts: commit=600
Sep 12 11:18:37 localhost kernel: [ 595.478866] ehci_hcd 0000:00:1a.0: PCI INT A disabled
Sep 12 11:18:37 localhost kernel: [ 595.478919] ehci_hcd 0000:00:1a.0: PME# enabled
Sep 12 11:18:37 localhost kernel: [ 595.498827] ehci_hcd 0000:00:1d.0: PCI INT A disabled
Sep 12 11:18:37 localhost kernel: [ 595.498877] ehci_hcd 0000:00:1d.0: PME# enabled
After this the the mouse goes dead (the light on the mouse also goes off).
If I disconnect the mouse at this stage, there is no change in kernel.log. If I the mouse back too, there is no change in kernel.log.
Now, when I turn the AC adaptor on, this is the output on kernel.log
Sep 12 11:22:16 localhost kernel: [ 813.917712] EXT4-fs (sda6): re-mounted. Opts: commit=0
Sep 12 11:22:16 localhost kernel: [ 813.977405] NMI watchdog enabled, takes one hw-pmu counter.
Sep 12 11:22:16 localhost kernel: [ 813.977453] NMI watchdog enabled, takes one hw-pmu counter.
Sep 12 11:22:16 localhost kernel: [ 813.980838] NMI watchdog enabled, takes one hw-pmu counter.
Sep 12 11:22:16 localhost kernel: [ 813.980874] NMI watchdog enabled, takes one hw-pmu counter.
Sep 12 11:22:16 localhost kernel: [ 814.075104] ehci_hcd 0000:00:1a.0: BAR 0: set to [mem 0xd6970000-0xd69703ff] (PCI address [0xd6970000-0xd69703ff])
Sep 12 11:22:16 localhost kernel: [ 814.075148] ehci_hcd 0000:00:1a.0: restoring config space at offset 0xf (was 0x100, writing 0x10b)
Sep 12 11:22:16 localhost kernel: [ 814.075189] ehci_hcd 0000:00:1a.0: restoring config space at offset 0x1 (was 0x2900000, writing 0x2900002)
Sep 12 11:22:16 localhost kernel: [ 814.075256] ehci_hcd 0000:00:1a.0: PME# disabled
Sep 12 11:22:16 localhost kernel: [ 814.075279] ehci_hcd 0000:00:1a.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
Sep 12 11:22:16 localhost kernel: [ 814.075295] ehci_hcd 0000:00:1a.0: setting latency timer to 64
Sep 12 11:22:17 localhost kernel: [ 814.228224] ehci_hcd 0000:00:1d.0: BAR 0: set to [mem 0xd6950000-0xd69503ff] (PCI address [0xd6950000-0xd69503ff])
Sep 12 11:22:17 localhost kernel: [ 814.228246] ehci_hcd 0000:00:1d.0: restoring config space at offset 0xf (was 0x100, writing 0x10a)
Sep 12 11:22:17 localhost kernel: [ 814.228273] ehci_hcd 0000:00:1d.0: restoring config space at offset 0x1 (was 0x2900000, writing 0x2900002)
Sep 12 11:22:17 localhost kernel: [ 814.228310] ehci_hcd 0000:00:1d.0: PME# disabled
Sep 12 11:22:17 localhost kernel: [ 814.228324] ehci_hcd 0000:00:1d.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
Sep 12 11:22:17 localhost kernel: [ 814.228333] ehci_hcd 0000:00:1d.0: setting latency timer to 64
Sep 12 11:22:17 localhost kernel: [ 814.614404] usb 2-1.1: reset low speed USB device number 3 using ehci_hcd
At this point, the mouse comes back to life (its light begins to glow) and I can move the mouse pointer on the screen.
The output of the grep command that rwd gave is too big (16000 lines) to be pasted here..
Thanks,

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Problems with multiple USB devices. (Possible Low Power on USB Bus)

I believe I'm having an issue with the USB bus or one of my devices that I have installed on my iMac.
I purchased this iMac along with a printer (HP C4280 All-in-One) as part of a promotion deal. I also have wireless logitech USB mouse, and iPhone and an 80gb 5th Gen iPod.
My problem has to do with syncing the iPod and iPhone. Normally I have the printer attached to the iMac along with the USB mouse. Both devices function as expected. However I have problems when I connect the iPhone or iPod.
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I've been dealing with this problem for a couple months and found that if I disconnect the printer (HP C4280) then connected either other device then everything works just fine.
I downloaded XCode 2.5 and launched the USB Prober utility. Then plugged in each device in turn and found some interesting findings.
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128.517 [1] USB Device iPhone is violating Section 9.3.5 of the USB Specification -- Error in GetConfigDescriptor( wLength = 4)
128.520 [1] USB Low Power Notice: The device "iPhone" cannot be used because there is not enough power to configure it
128.528 [1] USB Low Power Notice: The device "iPhone" cannot be used because there is not enough power to configure it
128.629 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
When connecting the iPod (1st attempt) the USB Logger reported; (iTunes never showed that the iPod devices was connected)
938.797 [1] USB Device IOUSBDevice is violating Section 9.3.5 of the USB Specification -- Error in GetConfigDescriptor( wLength = 4)
938.801 [1] IOUSBCompositeDriver[0x39b9f80](IOUSBDevice) SetConfiguration (1) returned 0xe00002ed
938.900 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
When connecting the iPhone (2nd attempt) the USB Logger reported; (iTunes displayed msg 2 from above)
1789.023 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
1802.166 [1] AppleUSBEHCI[0x28a7000]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
1809.166 [1] AppleUSBEHCI[0x28a7000]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
I'm suspicious of the USB Low Power Notice. If this is true then I suspect the my iMac might need some type of repair. However I am also suspicious of USB Device violating the USB Spec Error. Although this is the message that appears when I plug in the iPhone or iPod I don't think I can assume that error relates to the iPod or iPhone. The error doesn't specify which USB Device is in violation.
My current workaround is to unplug the printer every time I sync the iPhone or iPod which is cumbersome. I'm also worried that repeated connecting/disconnecting of USB plug for the printer will over time damage the USB port.
I'm not sure what options I have here. Can anyone provide some suggestions or information that might provide some insight.
Best Regards,
xgnomex

A-Ha! Now I'm feeling like my 1.5 hours of reading this forum are not wasted, since I've found others with similar symptoms.
I've only had my iMac for two weeks today. I've got some new accessories & have experimented with the ones I've had awhile (various USB external drives). My model has 3 USB ports, one of which is taken by the keyboard, of course.
Over the weekend, I picked up an MS Office 2008 Upgrade and also an HP Officejet Pro L7680 all-in-one. I only mention the Office upgrade because I installed it on the same day as the printer, but it's possibly unrelated.
I actually have a Belkin 4-port hub--not the same one suggested in this thread, but externally powered with it's own A/C adapter. (It's a Hi-Speed USB 2.0 r-Port Hub, model F5U234 Rev.3, and I used it with a previous iMac G3 CRT with no problem.)
So with a LaCie 100 GB USB Mobile Drive in one of the iMac's ports, and the HP L7680 in the iMac's third port, or the HP via the Belkin hub in iMacs the third hub, here are some of the symptoms I've seen:
1) while browsing in Firefox, suddenly the mouse-cursor will "freeze" (get stuck) in a pull-down selector...sometimes it unfreezes, but eventually (like on the next pull-down menu) the keyboard & mouse will shut off (and if you wait & the iMac goes to sleep, the keyboard won't let me enter my unlock password when I wake the iMac with the Apple Remote)
2) when trying to open a document from the LaCie in MS Word, Word freezes and the keyboard & mouse go dead--terminal beachball--to restart the computer, I have to hold in the power button
3) when trying to print a message in Mail, Finder freezes (though the print job does finish)
These symptoms seem strange! Hey, it's just supposed to work, right? But everything has limits, so my question becomes, "how much stuff can I hook up at once?"
I wonder if this Apple article is addressing this issue:
http://docs.info.apple.com/article.html?artnum=25243
especially when it says "Two high-bandwidth devices or two isochronous devices cannot be connected to a single Universal Serial Bus (USB)."
So only two hi-speed USB devices can be connected "to the same bus" simultaneously? I'm not entirely sure I understand what "isochronous" means, but I'm thinking I need to peel my printer off the USB somehow, maybe via Airport Express--?
Does anyone know for sure about USB limitations? Thanks.
Also, xgnomex, how/where did you find that "USB Logger"? Is that something iPhone-specific, or is it an OS X log in a Library somewhere?

MSI E350IA-E45 boot/post problem with some USB devices

Hi,
My new mainboard E350IA-E45 with BIOS ver. 1.4 has problems "BIOS problems" booting/posting when I connect a USB IR Receiver from CyberLink and also with a USB wireless adapter model USB-N10 from ASUS, using USB 2.0 or USB 3.0 ports.
It does the problem with one of the two devices or the two at the same time connected.
With the Logo disabled, I only see a number (not always the same) at the bottom right of the screen when I boot/reboot, and I cannot enter BIOS. If I wait a while, about half a minute Windows starts and other times not ( I'm not sure at this moment).
When this happens (not booting/posting) if I remove (while powered) these devices the motherboard posts immediately and normal operation is back !
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Quote from: Bas on 13-October-11, 15:28:28
How can you call this explanation "working fine" ??
Your powersupply is just 75W, anything can happen with so little power.
As said before, test the board with a 300W powersupply and see if it solves it.
I bought this Mini-ITX case to have a silent HTPC, its height is 62mm, so where do I put a power supply of 300W using this case if the problem realy "is" the power adapter ! Sorry to say that, but for me it's not the power adapter.
When I BOOT it, my power meter indicates the maximum value and it's between 25-30 watts, and you say that a 75W external adapter is not enough and what about netbooks or nettops with Zacate inside with similar adapters !
Can you explain to me why or how it fails to POST in few seconds (or no POST at all) with one of these devices that has a tiny power consumption. And why it POST with a external USB HDD ! It makes no sense to me.
Anyway if there is no solution to this problem (maybe BIOS update), I don't mind very much to wait about 20 seconds until it POST with the two devices connected, because after that I have no other problems.
Best regards.

IPhone causes problems on other USB devices?

Is anyone having problems with external USB hard drives or any other USB peripheral when his iPhone is connected to a Windows PC or sometime after that?
I'm having some problems with external USB hard drives when the Windows system is continuously hammering them for more than a half-hour. The problem is not easily reproducable, and I don't know the cause.
It probably has nothing to do with the iPhone. But one possibility I have to consider is that the iPhone draws enough current (or something else I haven't thought of) that interefers with the USB communications.

What I meant in my previous post was that the USB wouldn't allow the iPhone to draw more current than the USB can safely provide, unless it was defective. I have an external hardrive, a wireless mouse, my printer and my iPhone connected directly to my laptop's USB ports and have not seen any problems with any of them. In several years of using USB devices, I've not seen any problems that I could assign to the USB ports/controllers... they just seem to work all the time. Will be interested as to your findings.

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Hi there,
I writing this because I'm having some really big problems with my USB ports.
A few days ago I plugged in an USB-Hub that was quite cheap. Suddenly a window popped up saying that a USB device was deactivated because it "needed" to much power. Since this happening, two of those windows keep popping up everytime I boot the MacBook. I called Apple and got some help: I had to delete some .plist files and clear some caches. The man who helped was able to find the error and deactivate the notification, he also told me to make a PRAM- and a SMC-reset. The man said that it's just a software problem and that I have to reinstall the system if we don't find a solution. So, one day later I reinstalled the system (Lion) and not only didn't it help, the two notification windows were popping up again...everytime I booted the Mac. So I decided to formate the whole hard drive and install Snow Leopard -> still the problem with the USB ports. After that I installed Lion -> still the problem with the USB ports. I even tried to extract the .kext files that are important for the USB functionality from an earlier Combo Update, but it didn't help either. The point is, that the Mac doesn't recognize my external hard drive or any of my iDevices. Sometimes it recognizes USB sticks, but only after 20 seconds. The data transfer on both USB ports is also very slow. If I'm lucky and Mac recognizes one of my USB sticks, it takes like an hour for 1GB to be transfered on the USB stick or from the USB sticks to the Mac.
I really don't know what to do and need help, especially because my backup data is on my external hard drive which I can't access because of this problem.
I really hope that someone can help me, I'm very thankful for every answer that could help me!
PS: Sorry for my bad English, I hope that everyone understands what I mean, please tell me if you don't get what I'm trying to explain in the text above.
Sincerely,
iLoud
[UPDATE] I downloaded "USB Prober" and copied the Output file, maybe it helps:
Timestamp Lvl            Message
    0.698 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7316), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.698 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.735 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.735 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.735 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.739 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.739 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.761 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7320), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.761 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.798 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.798 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.798 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.801 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.801 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.823 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7324), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.823 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.860 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.860 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.860 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.863 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.863 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.885 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7328), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.885 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.922 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.922 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.922 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.926 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.926 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    0.947 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7332), outstandingIO(0), _interruptReadPending(false) - rearming read
    0.947 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    0.984 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    0.984 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    0.984 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    0.987 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    0.987 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    1.009 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7336), outstandingIO(0), _interruptReadPending(false) - rearming read
    1.009 [3]          AppleUSBUHCI[0x4f97000]::UIMCreateInterruptTransfer - root hub interrupt transfer - clearing unneeded memDesc (0x5073080) from dmaCommand (0x506a100)
    1.045 [3]          AppleUSBUHCI[0x4f97000]::UIMAbortEndpoint - endpoint 1:1,1
    1.045 [3]          AppleUSBUHCI[0x4f97000]::RHAbortEndpoint - Interrupt pipe - noting status change
    1.045 [3]          AppleUSBHub[0x5076c00]::InterruptReadHandler error kIOReturnAborted (expected)
    1.049 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - Host controller resume detected - calling EnsureUsability
    1.049 [2]          AppleUSBUHCI[0x4f97000]::HandleInterrupt - deferring further processing until we are running again
    1.071 [3]          AppleUSBHub[0x5076c00]::DecrementOutstandingIO(7340), outstandingIO(0), _interruptReadPending(false) - rearming read

Oh, sorry, I meant "I'm writing this...".

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I just updated my latest java but the update is causing problems with some externale devices. So i would like to uninstall this latest java update and get back the previous one. That should solve to problems with my external device

i just updated my latest java but the update is causing problems with some external devices. So i would like to uninstall this latest java update and get back the previous one. That should solve to problems with my external device.
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Juko
I am running
Hardware Overview:
Model Name:          Mac Pro
Model Identifier:          MacPro1,1
Processor Name:          Dual-Core Intel Xeon
Processor Speed:          2,66 GHz
Number of Processors:          2
Total Number of Cores:          4
L2 Cache (per Processor):          4 MB
Memory:          6 GB
Bus Speed:          1,33 GHz
Boot ROM Version:          MP11.005D.B00
SMC Version (system):          1.7f10
Serial Number (system):          CK7XXXXXXGP
Hardware UUID:          00000000-0000-1000-8000-0017F20F82F0
System Software Overview:
System Version:          Mac OS X 10.7.5 (11G63)
Kernel Version:          Darwin 11.4.2
Boot Volume:          Macintosh HD(2)
Boot Mode:          Normal
Computer Name:          Mac Pro van Juko de Vries
User Name:          Juko de Vries (jukodevries)
Secure Virtual Memory:          Enabled
64-bit Kernel and Extensions:          No
Time since boot:          11 days 20:39
Message was edited by Host

Java 6 you can't as Apple maintains it, and Java 7 you could if you uninstall it and Oracle provides the earlier version which they likely won't his last update fixed 37 remote exploits.
Java broken some software here and there, all you'll have to do is wait for a update from the other parties.

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Hi,
I am working on a project using PIC18F4550 MCU and USB.
I would need to send and receive data from the MCU thru USB. I have uninstaled the HID and created a new NI-VISA driver for my MCU. this worked fine, and it did showed up in MAX
Unfortunately I was not able to receive data from the MCU, Just sending!
I thought to use HID.DLL but the way I need to use the functions inside the HID DLL is simply too much for me, I am not a PC programmer.
There is any kind of VI that is able to use HID.DLL to comunicate with external devices conected to PC thru USB?
Please Help
Andrei

FMLE 3.0.0.4743 Problem with video capture device

log:
Tue May 05 2009 14:26:54 : Selected video input device: Beholder A/V Capture (SAA7135) [Slot 2]
Tue May 05 2009 14:26:54 : Selected audio input device: Beholder Aud Capture (SAA7135)
Tue May 05 2009 14:26:55 : Problem with video capture device. Please verify that the video capture device is working correctly and is not already in use.
Tue May 05 2009 14:26:56 : Audio Device Error : The selected audio device "Beholder Aud Capture (SAA7135)" doesn't allow setting volume intensity. Disabling the volume slider control.
Flash Media Encoder 2.5 working without any errors

The second message that you are getting "The selected audio device "Beholder Aud Capture (SAA7135)" doesn't allow setting volume intensity. Disabling the volume slider control." is because your device does not let you change intensity of volume. This warning message is just to tell user that volume slider will remain disabled for the selecetd device. This is new addition in FMLE 3.0 and was not there in FMLE 2.5
Also for first message, please make sure that no other instance of FMLE is already running using this device. You can verify this from task manager. If any other instance of FMLE is running then please close that instance so that device gets free for new instance.

Problem with video capture device, with a virtual camera

I try to use Adobe Flash Media Live Encoder 3 with a virtual camera(DirectShow Filter) but met such a problem:
"Error connecting input preview RGB filter."
"Failed with error 80004005:SetupInputVideoPreview(pFilter, pguidCategory)"
"Failed with error ffffff97:SetupVideoPreview(pFilterSource)"
"Problem with video capture device. Please verify that the video capture device is working correctly and is not already in use."
However, it is good to use AMCap,
what's the problem with FMLE.
Looking forward to your replies. Thx!

Did you ever figure out the problem/solution?
I am experiencing the same thing with my virtual camera filter when connecting to FME?
Shawn

When ever I use Adobe reader 11 with a USB device, I cannot safe remove the USB device and get the following message (or similar one) in system log: The application \Device\HarddiskVolume1\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe with pr

When ever I use Adobe reader 11 with a USB device, I cannot safe remove the USB device and get the following message (or similar one) in system log: The application \Device\HarddiskVolume1\Program Files (x86)\Adobe\Reader 11.0\Reader\AcroRd32.exe with process id 6620 stopped the removal or ejection for the device USB\VID_05DC&PID_C75C\20131215015821328FC8.
I am running on Windows Server 2012 R2 in Desktop Experience mode.
Any ideas?
Roger

In addition to that symptom, I discovered that even though I had closed all Adobe Reader sessions, the processes kept running and used up 90%+ of my CPU.

Problem with detecting USB devices.. something abt ehci-hcd??

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