As per reported by several users, such as in https://ubuntuforums.org/showthread.php?t=2333398, apps that control screen gamma, such as Redshift/Flux/brightness-controller, stopped working under the newest kernel 4.4.0-34 in Ubuntu 16.04 LTS, and we're not sure what caused the issue.
Those apps are still working well on external monitors. It's just the internal monitor that is not responsive. Any setting just simply has no effect.
It seems that all the users are using Skylake-based laptop.
In my case, my laptop is on Skylake and GTX980M.
Links for the individual apps mentioned above:
- Redshift http://jonls.dk/redshift/
- Flux https://justgetflux.com/linux.html
- brightness-controller https://apps.ubuntu.com/cat/applications/brightness-controller/
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ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jx 4045 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=66785c85-3633-4f60-b15d-718b7b14873e
InstallationDate: Installed on 2016-04-25 (125 days ago)
InstallationMedia: It
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:0a2a Intel Corp.
Bus 001 Device 002: ID 046d:c07e Logitech, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Hasee Computer CP65R
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-34-generic root=UUID=d940d1fe-4c2c-4de3-b82d-108083812e0e ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
RelatedPackageVersions:
linux-restricted-modules-4.4.0-34-generic N/A
linux-backports-modules-4.4.0-34-generic N/A
linux-firmware 1.157.3
Tags: xenial
Uname: Linux 4.4.0-34-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/18/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.05
dmi.board.asset.tag: Tag 12345
dmi.board.name: P65_P67RGRERA
dmi.board.vendor: Notebook
dmi.board.version: Not Applicable
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Notebook
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.05:bd09/18/2015:svnHaseeComputer:pnCP65R:pvrNotApplicable:rvnNotebook:rnP65_P67RGRERA:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
dmi.product.name: CP65R
dmi.product.version: Not Applicable
dmi.sys.vendor: Hasee Computer
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1617686
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.