Ubuntu 16.10, Dell XPS 15 9550, DNS problem after suspend/resume

[Cruz Fernandez]

After suspend/resume the wifi network comes back, but the DNS doesn't work. I've tried to ping a known IP and it works ok though.

My normal solution is to restart the network totally (haven't found a smaller way to fix the skewed DNS server locally):

sudo systemctl restart network-manager.service

Not sure if I should report this on other package related to the DNS systemd resolve?

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: linux-image-4.8.0-42-generic 4.8.0-42.45
ProcVersionSignature: Ubuntu 4.8.0-42.45-generic 4.8.17
Uname: Linux 4.8.0-42-generic x86_64
ApportVersion: 2.20.3-0ubuntu8.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: cruz 2658 F...m pulseaudio
 /dev/snd/controlC0: cruz 2658 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Mar 17 11:34:54 2017
HibernationDevice: RESUME=UUID=afd0c8e7-78e3-47d1-b086-10c627ac3d76
InstallationDate: Installed on 2016-06-13 (277 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp.
 Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp.
 Bus 001 Device 004: ID 1bcf:2b95 Sunplus Innovation Technology Inc.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 15 9550
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-42-generic root=UUID=0bdc13dd-b122-4879-8d8a-31cce3301ef5 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.8.0-42-generic N/A
 linux-backports-modules-4.8.0-42-generic N/A
 linux-firmware 1.161.1
SourcePackage: linux
UpgradeStatus: Upgraded to yakkety on 2017-03-08 (8 days ago)
dmi.bios.date: 12/22/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.19
dmi.board.name: 0N7TVV
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.2.19:bd12/22/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 15 9550
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.11 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc2

[Cruz Fernandez (cruz-fernandez)]

It started happening after upgrade from Ubuntu 16.04 to 16.10. Kernels affected are: 4.8.0-42 and 4.8.0-41 AFAIK.

I'll install latest kernel probably tomorrow if possible and come back to you @jsalisbury

Thanks for the fast response!

[Cruz Fernandez (cruz-fernandez)]

Just tried kernel 4.11.0-041100rc2-generic one. Looks like that the bug is happening (had some issues compiling the DKMS nvidia-357 and virtualbox, but still could boot up that kernel).

[Paulo Almeida Filho (palmeidaprog)]

I believe it happens prior to 4.8.0-41. Since I upgraded the kernel from 4.6.4 to 4.8.0-32 i started having this exact same problem. I'm on a desktop running mint 18 (ubuntu 16.10 based).

[C.P. Dehli (dehli)]

I recently purchased a Dell XPS 13 and installed 16.10 on it. I'm experiencing the same issue where I must restart my wifi service after the computer sleeps. I'll be upgrading to 17.04 as soon as it's released and will let you know if the issue still exists.

[Cruz Fernandez (cruz-fernandez)]

Looks like this problem is not happening on suspend/resume for my 17.04 - Dell XPS 15 9550.