kernel-packages team mailing list archive

Thread
Date

[Bug 1547884] [NEW] Broadcom Corp. BCM5880 Secure Applications Processor eats too much power

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1547884@xxxxxxxxxxxxxxxxxx>
Date: Sun, 06 Mar 2016 22:36:31 -0000
Reply-to: Bug 1547884 <1547884@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

You have been subscribed to a public bug:

$ 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 (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug third-party-packages trusty
-- 
Broadcom Corp. BCM5880 Secure Applications Processor eats too much power
https://bugs.launchpad.net/bugs/1547884
You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.