No, I have tried the old kernel which fail to solve the issue and the
problem is getting worse, that, other than the brightness adjusting issue,
I can't get in during system boot! It's totally black screen! I'm in agony
every time I tried to get in Ubuntu but got black screen instead. And the
pertinent post regrading  my booting issue has been closed due to no
activities for a long time! Now, I am posting another bug report, hoping
someone can help, thanks! And thank you for answering my posting 😊

On Mon, Jan 14, 2019, 13:20 Kai-Heng Feng <kai.heng.f...@canonical.com>
wrote:

> If the system is upgraded from 16.04, there should be some older kernels
> still in your system. See if those kernels still work.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1794995
>
> Title:
>   18.04 can't adjust brightness on ASUS T300F. Worked fine on 16.04.
>
> Status in linux package in Ubuntu:
>   Invalid
>
> Bug description:
>   Title of my display under Settings is "Unknown Display".
>
>   I think there's no proper display driver for my laptop in this new
>   distribution, "18.04", because the setting for my display works fine
>   before I upgrade from 16.04.
>
>   While I said "works fine", I meant, I could use the "fn" button plus
>   with the brightness adjusting button, which is "f5" and "f6" on my
>   laptop, to adjust the brightness.
>
>   Other than the "fn" combination button not working, I can't even
>   adjust the brightness in the setting and inside the main menu bar,
>   which I think there might have since a control center is one of the
>   features of this version upgrade.
>
>   So, thanks for reading my problem, and please help, otherwise, it's so
>   unhealthy for my eyes for looking at a screen with too bright for so
>   long and I have to look at the screen for so long.
>
>   Thanks in advance.
>
>   Ps, in case it's needed, the model of my laptop is, ASUS T300F. A
>   transform 2-in-one laptop. The fact that my laptop can "transform"
>   might be the reason why I got this issue, the drive that serves all
>   just fail to meet its needs. I'm sorry.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 18.04
>   Package: xorg 1:7.7+19ubuntu7.1
>   Uname: Linux 4.17.0-041700rc3-generic x86_64
>   .tmp.unity_support_test.1:
>
>   ApportVersion: 2.20.9-0ubuntu7.4
>   Architecture: amd64
>   CompizPlugins: No value set for
> `/apps/compiz-1/general/screen0/options/active_plugins'
>   CompositorRunning: None
>   CurrentDesktop: ubuntu:GNOME
>   Date: Fri Sep 28 21:44:14 2018
>   DistUpgraded: Fresh install
>   DistroCodename: bionic
>   DistroVariant: ubuntu
>   ExtraDebuggingInterest: Yes
>   GraphicsCard:
>    Intel Corporation HD Graphics 5300 [8086:161e] (rev 08) (prog-if 00
> [VGA controller])
>      Subsystem: ASUSTeK Computer Inc. HD Graphics 5300 [1043:15fd]
>   InstallationDate: Installed on 2018-04-04 (177 days ago)
>   InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64
> (20180228)
>   LightdmDisplayLog: (II) Server terminated successfully (0). Closing log
> file.
>   MachineType: ASUSTeK COMPUTER INC. T300FA
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.17.0-041700rc3-generic
> root=UUID=63fcbd04-ec8b-462c-ba66-4f45c229353c ro quiet splash nomodeset
> vt.handoff=1
>   Renderer: Software
>   SourcePackage: xorg
>   Symptom: display
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 09/01/2015
>   dmi.bios.vendor: American Megatrends Inc.
>   dmi.bios.version: T300FA.214
>   dmi.board.asset.tag: ATN12345678901234567
>   dmi.board.name: T300FA
>   dmi.board.vendor: ASUSTeK COMPUTER INC.
>   dmi.board.version: 1.0
>   dmi.chassis.asset.tag: No Asset Tag
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: ASUSTeK COMPUTER INC.
>   dmi.chassis.version: 1.0
>   dmi.modalias:
> dmi:bvnAmericanMegatrendsInc.:bvrT300FA.214:bd09/01/2015:svnASUSTeKCOMPUTERINC.:pnT300FA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnT300FA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
>   dmi.product.family: T
>   dmi.product.name: T300FA
>   dmi.product.version: 1.0
>   dmi.sys.vendor: ASUSTeK COMPUTER INC.
>   version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
>   version.libdrm2: libdrm2 2.4.91-2
>   version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
>   version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
>   version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
>   version.xserver-xorg-input-evdev: xserver-xorg-input-evdev
> 1:2.10.5-1ubuntu1
>   version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
>   version.xserver-xorg-video-intel: xserver-xorg-video-intel
> 2:2.99.917+git20171229-1
>   version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
>   xserver.bootTime: Fri Sep 28 21:43:24 2018
>   xserver.configfile: default
>   xserver.errors:
>    open /dev/dri/card0: No such file or directory
>    open /dev/dri/card0: No such file or directory
>    Screen 0 deleted because of no matching config section.
>    AIGLX: reverting to software rendering
>   xserver.logfile: /var/log/Xorg.0.log
>   xserver.outputs:
>
>   xserver.version: 2:1.19.6-1ubuntu4
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1794995/+subscriptions
>

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https://bugs.launchpad.net/bugs/1794995

Title:
  18.04 can't adjust brightness on ASUS T300F. Worked fine on 16.04.

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