Comment 16 for bug 1837117

Hi Po-Hsu Lin!

Thank you for the rapid reply. I have installed the kernel you suggested.
Also I removed "acpi_osi=" kernel parameter.
I confirm that everything works fine including the applet.
I hope this patch will become an official update for Ubuntu 16.04.

Thank you!
Best regards,
Sergey Nikitin

пт, 19 Июл 2019, 7:00 Po-Hsu Lin <email address hidden>:

> Hi,
> it looks like this might be the cause:
>
> https://kernel.ubuntu.com/git/ubuntu/ubuntu-xenial.git/commit/?h=master-next&id=423c214817cfb7c96c198a873bcb56b498458fb9
>
> With the fix:
>
> https://github.com/torvalds/linux/commit/1dd93f873d8ed8e5b228d1ae324b1f3c1e94bfa8
>
> Can you give this patched kernel a try to see if it can fix your issue?
> https://people.canonical.com/~phlin/kernel/lp-1837117-eeepc/
>
> Thanks
>
> ** Changed in: linux-signed (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1837117
>
> Title:
> Laptop backlight is off after system boot up
>
> Status in linux-signed package in Ubuntu:
> Incomplete
>
> Bug description:
> After kernel update the backlight on my Asus eeepc 1005px becomes off
> during boot up. I can see the login screen if I point light to the
> screen. The backlight is not reacting on brightness adjustment keys.
> The backlight starts working only if I close and open the laptop lid.
>
> I have tried to:
> * echo 10 > /sys/class/backlight/acpi_video0/brightness
> * echo 125 > /sys/class/backlight/intel_backlight/brightness
> * vbetool dpms on
> * pass "acpi_backlight=vendor" kernel parameter
> * install gdm instead of lightdm
> * create /usr/share/X11/xorg.conf.d/80-backlight.conf with content
> recommended in Kernel/Debugging/Backlight Wiki article
> with no luck.
>
> The backlight works fine if I pass "acpi_osi=" kernel parameter, the
> brightness is adjusted by keys, but the applet does not react to
> adjustments.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 16.04
> Package: linux-image-4.4.0-145-generic 4.4.0-145.171
> ProcVersionSignature: Ubuntu 4.4.0-145.171-generic 4.4.176
> Uname: Linux 4.4.0-145-generic x86_64
> ApportVersion: 2.20.1-0ubuntu2.18
> Architecture: amd64
> CurrentDesktop: XFCE
> Date: Thu Jul 18 22:30:44 2019
> InstallationDate: Installed on 2019-02-17 (151 days ago)
> InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
> (20160719)
> SourcePackage: linux-signed
> UpgradeStatus: No upgrade log present (probably fresh install)
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1837117/+subscriptions
>