[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

** Changed in: linux (Ubuntu) Assignee: Kai-Heng Feng (kaihengfeng) => (unassigned) -- 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/1686268 Title: Backlight brightness level not

Re: [Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

On Fri, May 26, 2017 at 19:55 Mario Limonciello wrote: > But so we're talking about the slider in the bios that adjusts keyboard > backlight right? That's not tied to display backlight. > No, the "Video" tab in BIOS has two sliders, one is for AC and another one is for

Re: [Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

But so we're talking about the slider in the bios that adjusts keyboard backlight right? That's not tied to display backlight. On Fri, May 26, 2017, 00:31 Kai-Heng Feng wrote: > It can't be reproduced once you changed the brightness via slider in > BIOS. > > It

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

It can't be reproduced once you changed the brightness via slider in BIOS. It should be reproduceable if the brightness was *never* touched in BIOS. Once the brightness is changed in BIOS, the issue can no longer be reproduced regardless the brightness value. -- You received this bug

Re: [Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Mine was about half in the battery slider and 0 in the AC slider. On Fri, May 26, 2017, 12:11 PM Mario Limonciello 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

Re: [Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

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 wrote: > Mario, can you take a look? > >

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

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

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Changing the brightness in the BIOS video tab got rid of the problem! Great!!! I am glad that you stumble upon that only AFTER you could confirm that the problem existed. :) Thank you for your time and assistance! -- You received this bug notification because you are a member of Kernel

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Also, try to upgrade to the latest BIOS, that may help: $ sudo fwupdmgr refresh $ sudo fwupdmgr update $ sudo reboot -- 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/1686268 Title:

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

The issue's gone after I changed brightness in BIOS video tab. So I cannot dig this anymore =( But try if this solves your issue. ** Changed in: linux (Ubuntu) Status: In Progress => Confirmed -- You received this bug notification because you are a member of Kernel Packages, which is

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

I now have Precision 5520 and I can reproduce the issue. I'll take a deeper look on this issue. ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng) ** Changed in: linux (Ubuntu) Status: Incomplete => In Progress -- You received this bug notification

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

About the reading in #20, it was the situation at that given time, not after a reboot. Since the /sys/class/backlight/intel_backlight/brightness was not 1500 (full brightness after reboot) I obviously changed it. The dynamic of what happens is shown in the "example" section of #23. After every

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

> 1. the grep . /var/lib/systemd/backlight/* shows the value of the brightness that was right before the last reboot. That doesn't change real-time when I change the brightness with the slider. The value appear to get stored right before the reboot. Yes, the service will restore brightness value

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Just discovered that the value returned by grep . /var/lib/systemd/backlight/* is ALWAYS the value of cat /sys/class/backlight/intel_backlight/brightness BEFORE reboot. So to summarize: 1. the grep . /var/lib/systemd/backlight/* shows the value of the brightness that was right before the last

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Setting the multi-user.target causes a timeout error at boot, complaining that it cannot connet lumetad (?). BTW, as another possibly useful detail. After reboot the cat /sys/class/backlight/intel_backlight/brightness and the grep . /var/lib/systemd/backlight/* give both 1500 (the maximum). AS

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Seems like there are two possibility: 1. systemd-backlight didn't restore the value successfully. 2. It did, but something else changed the value. Let's try this: $ sudo systemctl set-default multi-user.target Reboot and check if this happens. Use $ sudo systemctl set-default graphical.target To

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

$ cat /sys/class/backlight/intel_backlight/brightness 451 $ grep . /var/lib/systemd/backlight/* 75 -- 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/1686268 Title: Backlight brightness

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Hmm, I think I am still not pretty sure I fully understand the situation here. So, right after reboot, What's the value of `cat /sys/class/backlight/intel_backlight/brightness`? And the output of `grep . /var/lib/systemd/backlight/*`? -- You received this bug notification because you are a

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

1. The real value of the current brightness (e.g. 75) 2. As I said: after the reboot that value is the same (e.g. 75) 3. As soon as I move the slicer in the Gnome Shell Panel, the new value gets saved into the file (e.g. 150) To explain you better: it looks like the value in that file is kept in

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Ok, I think I should ask more explicitly: 1. What's the value of '/sys/class/backlight/intel_backlight/brightness' before reboot? 2. What's the value after reboot? 3. What do you mean "that value is saved as soon as I change the brightness"? -- You received this bug notification because you

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Yes, that value is saved as soon as I change the brightness. After reboot the brightness value is not restored (indeed the back-light is actually full brightness), although the value in that file is still the saved one. However running the `sudo /lib/systemd/systemd-backlight load

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

So is the value of '/sys/class/backlight/intel_backlight/brightness' the stored/restored value? -- 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/1686268 Title: Backlight brightness level

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

I forgot to say that the above output comes after commenting out the @reboot cron entry workaround and restarting, so it is exactly what it does without any workaround. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

The exact command you wrote: $ systemctl status systemd-backlight@intel_backlight.service systemd-backlight@intel_backlight.service - Load/Save Screen Backlight Brightness of intel_backlight Loaded: loaded (/lib/systemd/system/systemd-backlight@.service; static; vendor preset: enabled)

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

What's the output of `systemctl status systemd- backlight@intel_backlight.service`? -- 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/1686268 Title: Backlight brightness level not restored

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Apparently, it was working with 16.10 (4.8.0-46), although I had a different setup (GNOME desktop added on an official UBUNTU installation from DELL). The problem started with Ubuntu Gnome 17.04 (4.10.0-19) and persisted with 4.10.0-20. About testing the upstream kernel, I am willing to try. I

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem? Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.11

[Kernel-packages] [Bug 1686268] Re: Backlight brightness level not restored after reboot

apport information ** Tags added: apport-collected zesty ** Description changed: 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