So it looks like the initial brightness is got from atombios of graphic card, so it is atombios issue or the code can't correctly parse the atombios.
it is highly possible that this is an atombios issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1802834 Title: Dim screen after first boot on Thinkpad A285 Status in linux package in Ubuntu: Confirmed Bug description: We installed the 18.04 daily image on ThinkPad A285, found the screen is dim at the first boot. --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: u 1481 F.... pulseaudio /dev/snd/controlC0: u 1481 F.... pulseaudio CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 18.04 InstallationDate: Installed on 2018-11-12 (0 days ago) InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: LENOVO 20MWZ47RUS Package: linux (not installed) ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-38-generic root=UUID=347498ab-8eae-42d3-a1e3-74e9be6b6ba3 ro quiet splash vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-38-generic N/A linux-backports-modules-4.15.0-38-generic N/A linux-firmware 1.173.1 Tags: bionic Uname: Linux 4.15.0-38-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 09/21/2018 dmi.bios.vendor: LENOVO dmi.bios.version: R0XET30W (1.07 ) dmi.board.asset.tag: Not Available dmi.board.name: 20MWZ47RUS dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrR0XET30W(1.07):bd09/21/2018:svnLENOVO:pn20MWZ47RUS:pvrThinkPadA285:rvnLENOVO:rn20MWZ47RUS:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad A285 dmi.product.name: 20MWZ47RUS dmi.product.version: ThinkPad A285 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802834/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
