Public bug reported:
$ lsusb
Bus 004 Device 004: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications
Processor
$ sudo powertop
Power est. Usage Events/s Kategorie Popis
24.3 W 100,0% Device USB device: 5880
(Broadcom Corp)
On my Dell Latitude E6540 I constantly see this USB device eating about
20 W of power (and I don't see a reason for this kind of device to take
that much power). And yes, the fan is always running, even when the
computer is completely idle.
The computer has no fingerprint reader (though it was an optional
accessory, so the chip is IMHO built to support it). I use the
integrated smartcard reader (also handled by this chip). I've set up PAM
and LightDM to support smartcard login. However, the power usage is the
same regardless of whether a smartcard is inserted or not. I do not
intentionally use the integrated TPM chip in any way.
I faced this problem also on Ubuntu 14.04.3 with 3.19 kernel.
Eventually, this could also be a bug in powertop, but the fan almost
never stops (even with display backlight to minimum), so I think
powertop could be correct.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-27-generic 4.2.0-27.32~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-27.32~14.04.1-generic 4.2.8-ckt1
Uname: Linux 4.2.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Feb 20 15:33:49 2016
InstallationDate: Installed on 2013-11-05 (837 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: linux-lts-wily
UpgradeStatus: Upgraded to trusty on 2014-04-12 (678 days ago)
** Affects: linux-lts-wily (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug third-party-packages trusty
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https://bugs.launchpad.net/bugs/1547884
Title:
Broadcom Corp. BCM5880 Secure Applications Processor eats too much
power
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