You have been subscribed to a public bug:
As with all the proceeding distros from ubuntu 16.10 the brightness of the OLED
screen canot be set. Since xrander is no more present there is also no hack
around this problem anymore. This bug is a killer for using the system as full
brightness drains the battery quickly.
OLED screens have no backlight, thus this might be the issue.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue May 1 10:45:56 2018
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: marvin 1768 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=UUID=e81e811a-12aa-465d-ba3c-77e34b171b69
MachineType: LENOVO 20FRS2M600
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz root=/dev/nvme0n1p1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
RelatedPackageVersions:
linux-restricted-modules-4.15.0-20-generic N/A
linux-backports-modules-4.15.0-20-generic N/A
linux-firmware 1.173
Tags: bionic
Uname: Linux 4.15.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 06/23/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N1FET41W (1.15 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FRS2M600
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN1FET41W(1.15):bd06/23/2016:svnLENOVO:pn20FRS2M600:pvrThinkPadX1Yoga1st:rvnLENOVO:rn20FRS2M600:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Yoga 1st
dmi.product.name: 20FRS2M600
dmi.product.version: ThinkPad X1 Yoga 1st
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Low
Status: Incomplete
** Tags: amd64 apport-bug apport-collected bionic bios-outdated-1.36
regression-potential
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OLED X1 yoga lenove, screen ubuntu, brightness issue
https://bugs.launchpad.net/bugs/1768208
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