/dev/hwrng not created on i3-4010U

[Nick Maynard]

This CPU supports rdrand, but /dev/hwrng is not created at boot time.

Reinstalling rng-tools creates /dev/hwrng but it is lost at reboot.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: linux-image-generic 3.16.0.24.25
ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
Uname: Linux 3.16.0-23-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/controlC1', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA:
 country EU: DFS-UNSET
  (2402 - 2482 @ 40), (N/A, 20)
  (5170 - 5250 @ 40), (N/A, 20)
  (5250 - 5330 @ 40), (N/A, 20), DFS
  (5490 - 5710 @ 40), (N/A, 27), DFS
Date: Sat Nov 1 08:27:45 2014
HibernationDevice: RESUME=UUID=0204c6b1-868e-4140-a1d0-37207b1dcaa7
InstallationDate: Installed on 2014-04-17 (197 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-23-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.16.0-23-generic N/A
 linux-backports-modules-3.16.0-23-generic N/A
 linux-firmware 1.138
SourcePackage: linux
UpgradeStatus: Upgraded to utopic on 2014-10-09 (22 days ago)
dmi.bios.date: 10/17/2013
dmi.bios.vendor: Intel Corp.
dmi.bios.version: WYLPT10H.86A.0021.2013.1017.1606
dmi.board.name: D34010WYK
dmi.board.vendor: Intel Corporation
dmi.board.version: H14771-303
dmi.chassis.type: 3
dmi.modalias: dmi:bvnIntelCorp.:bvrWYLPT10H.86A.0021.2013.1017.1606:bd10/17/2013:svn:pn:pvr:rvnIntelCorporation:rnD34010WYK:rvrH14771-303:cvn:ct3:cvr:

[Brad Figg (brad-figg)]

This change was made by a bot.

[Nick Maynard (nick-maynard)]

It appears it's possible to make rngd pick up the feature properly - see this page:

https://wiki.archlinux.org/index.php/ASUS_Zenbook_Prime_UX31A#rdrand

However, I wonder if /dev/hwrng should be created regardless...

[penalvch (penalvch)]

Nick Maynard, thank you for reporting this and helping make Ubuntu better. As per https://downloadcenter.intel.com/SearchResult.aspx?lang=&ProductID=3744&ProdId=3744 an update to your BIOS is available (0030). If you update to this following https://help.ubuntu.com/community/BiosUpdate does it change anything? If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report.

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Once the BIOS is updated, then please mark this report Status Confirmed.

Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]