Bug 439740
| Summary: | uvcvideo driver consumes more power even if the webcam is not used | ||||||||
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| Product: | [Fedora] Fedora | Reporter: | William Lovaton <walovaton> | ||||||
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> | ||||||
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | low | ||||||||
| Version: | 11 | ||||||||
| Target Milestone: | --- | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | All | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2010-06-28 10:34:08 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Embargoed: | |||||||||
| Attachments: |
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Description
William Lovaton
2008-03-31 03:13:41 UTC
Created attachment 299670 [details]
powertop output for the command line
I collected this with the following command:
# sleep 5 ; powertop -d 20
This is running the Fedora Rawhide Snapshot on a USB stick in init 3, then I
disabled a few services just for the sake of taking wake ups to a minimum.
Here you can see that it would have been an excellent 3 wps or less if it not
were for this bug (ehci_work) showing up in the stats.
it's probably something periodically waking up to do disk IO (and hence waking up the usb stick). Created attachment 299684 [details]
powertop output for the gnome desktop
Again, I collected this with the following command using gnome-terminal:
# sleep 5 ; powertop -d 20
This is running the Fedora Rawhide Snapshot on a USB stick in init 5, the only
thing I disabled was the wireless networking in NetworkManager so the iwl3945
driver doesn't show up here.
Note that there is a new entry I didn't see before with previous kernels:
21.8% ( 4.8) <kernel IPI> : Rescheduling interrupts
What is that? what is the definition of IPI? I guess this is something new in
the kernel.
Besides this there is another one: <kernel IPI> : TLB shootdowns but it doesn't
show up high in the stats.
Another thing, this bug is in Fedora 8 with the latest updates too but the
entry in powertop looks like this:
5,9% ( 10,0) nash-hotplug : ehci_irq (ehci_watchdog)
I guess this is the same problem. What it nash-hotplug?? I can't see any
process running with that name.
Dave, so the only way to confirm this is installing Rawhide on the hard drive?? or may be using the Live CD instead of the USB stick?? I wonder if you see the same thing on your laptop or this is just me. I am using a Dell XPS M1210 laptop with Intel Core Duo ICH7 chipset. Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Well, this still happens in Fedora 10 Preview. On my laptop (Dell XPS M1210) I just realized that it was due to the uvcvideo driver for the webcam. Removing that driver solves the wake ups. But, on my desktop computer (Dell XPS 420 Quad Core) it uses the same driver because my 22" LCD monitor has a compatible webcam, I remove the driver but it doesn't solve the wake ups. So, what else can I do to figure out the real source in this case? Maybe is it because of the mouse and keyboard being connected to an USB port? This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle. Changing version to '10'. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Ok, this is a driver problem and every time I power up my laptop y have to "modprobe -r uvcvideo" to reduce the power consumption. As I said in my first comment the module wakes up the cpu 10 times per second. This problem is being worked upstream by Laurent Pinchart y Matthew Garrett: http://bugzilla.kernel.org/show_bug.cgi?id=11948 It would be nice if the kernel can handle this situation automatically and save power while the webcam is not being used. This message is a reminder that Fedora 11 is nearing its end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 11. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '11'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 11's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 11 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug to the applicable version. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed. |