Comment 32 for bug 1686268

Mine was about half in the battery slider and 0 in the AC slider.

On Fri, May 26, 2017, 12:11 PM Mario Limonciello <email address hidden> wrote:

> That sounds a little crazy that it can't reproduce in my opinion. When it
> "did" reproduce was the brightness at one of the extremes? Eg full high on
> shutdown or full low on shutdown?
>
> On Thu, May 25, 2017, 03:21 Kai-Heng Feng <email address hidden>
> wrote:
>
> > Mario, can you take a look?
> >
> > A quick summary:
> > 1. Boot the system.
> > 2. The value systemd-backlight read from intel backlight is 0.
> > 3. systemd-backlight restore the value it from
> /var/lib/systemd/backlight.
> > 4. Brightness value being overwritten to maximum value, 1500.
> >
> > After I changed the brightness slider in BIOS:
> > 1. Boot the system.
> > 2. The value systemd-backlight read from intel backlight is a sane value,
> > not 0 anymore.
> > 3. systemd-backlight restore the value it from
> /var/lib/systemd/backlight.
> > 4. profit.
> >
> > Restore defaults in BIOS cannot revert the behavior back to the bad one.
> >
> > --
> > You received this bug notification because you are subscribed to the bug
> > report.
> > https://bugs.launchpad.net/bugs/1686268
> >
> > Title:
> > Backlight brightness level not restored after reboot
> >
> > To manage notifications about this bug go to:
> >
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686268/+subscriptions
> >
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1686268
>
> Title:
> Backlight brightness level not restored after reboot
>
> Status in linux package in Ubuntu:
> Confirmed
>
> Bug description:
> I am not sure if this is the right place to report this, so feel free
> to move it elsewhere.
>
> It looks like the systemd-backlight service (/lib/systemd/system
> /systemd-backlight@.service) does not restore the brightness level
> (although it saves it before shut-down).
>
> However the following command does restore the saved brightness:
>
> sudo /lib/systemd/systemd-backlight load backlight:intel_backlight
>
> As a temporary solution to automate it at boot I am using the
> following line added to the root cron:
>
> @reboot /lib/systemd/systemd-backlight load backlight:intel_backlight
>
> - Ubuntu 4.10.0-20.22-generic 4.10.8
> - Gnome 3.24
>
> Please, let me know if you need more info. Thanks.
> ---
> ApportVersion: 2.20.4-0ubuntu4
> Architecture: amd64
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: dd 1540 F.... pulseaudio
> CurrentDesktop: GNOME
> DistroRelease: Ubuntu 17.04
> InstallationDate: Installed on 2017-04-12 (13 days ago)
> InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64
> (20170411)
> Lsusb:
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 002: ID 8087:0a2b Intel Corp.
> Bus 001 Device 003: ID 1bcf:2b95 Sunplus Innovation Technology Inc.
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> MachineType: Dell Inc. Precision 5520
> Package: linux (not installed)
> ProcFB: 0 inteldrmfb
> ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-20-generic.efi.signed
> root=/dev/mapper/nvme-ubuntu_gnome ro systemd.restore_state=1 quiet splash
> vt.handoff=7
> ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8
> RelatedPackageVersions:
> linux-restricted-modules-4.10.0-20-generic N/A
> linux-backports-modules-4.10.0-20-generic N/A
> linux-firmware 1.164
> Tags: zesty
> Uname: Linux 4.10.0-20-generic x86_64
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups: adm cdrom dip input lpadmin plugdev sambashare sudo
> _MarkForUpload: True
> dmi.bios.date: 03/29/2017
> dmi.bios.vendor: Dell Inc.
> dmi.bios.version: 1.2.4
> dmi.board.name: 06X96V
> dmi.board.vendor: Dell Inc.
> dmi.board.version: A00
> dmi.chassis.type: 10
> dmi.chassis.vendor: Dell Inc.
> dmi.modalias:
> dmi:bvnDellInc.:bvr1.2.4:bd03/29/2017:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn06X96V:rvrA00:cvnDellInc.:ct10:cvr:
> dmi.product.name: Precision 5520
> dmi.sys.vendor: Dell Inc.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1686268/+subscriptions
>