Does not recognize external monitor

[Jarno Suni]

Neither HDMI (digital) nor VGA (analog) output work with the kernel. With 4.4.0-112-generic they work fine.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-116-generic 4.4.0-116.140
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jarnos 1778 F.... pulseaudio
CurrentDesktop: XFCE
Date: Sat Mar 3 09:35:16 2018
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=19c075ab-2b2e-4285-a3a5-dbd15ee7b31e
InstallationDate: Installed on 2015-11-21 (832 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-116-generic root=UUID=bdc3be24-dee9-4ead-bca0-c9b1e45a87e5 ro persistent quiet splash
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-116-generic N/A
 linux-backports-modules-4.4.0-116-generic N/A
 linux-firmware 1.157.17
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/01/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68MVD Ver. F.20
dmi.board.name: 30C5
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 71.36
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68MVDVer.F.20:bd12/01/2011:svnHewlett-Packard:pn:pvrF.20:rvnHewlett-Packard:rn30C5:rvrKBCVersion71.36:cvnHewlett-Packard:ct10:cvr:
dmi.product.version: F.20
dmi.sys.vendor: Hewlett-Packard

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

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 v4.16 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/v4.16-rc4

[Jarno Suni (jarnos)]

As told in the description, with kernel 4.4.0-112-generic the outputs are recognized and work fine.
The next kernel I installed was 4.4.0-116-generic with which the bug appears. The bug is not fixed in v4.16-rc4.

[Kai-Heng Feng (kaihengfeng)]

Make sure your system is up to date.
$ sudo apt update && sudo apt -y dist-upgrade

View the nvidia module name/version:

$ dkms list

Rebuild your nvidia module
$ sudo dkms remove ${nvidia-module-name}/${nvidia-module-version} -k 4.4.0-116-generic
$ sudi dkms install ${nvidia-module-name}/${nvidia-module-version} -k 4.4.0-116-generic

reboot and test.

[Jarno Suni (jarnos)]

$ dkms list
outputs nothing

[Jarno Suni (jarnos)]

I used "dkms status" to get the required information about the module name (nvidia-340) and version (340.104)

After rebuilding and rebooting at least HDMI works with 4.4.0-116-generic