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 a member of Kernel Packages, which is subscribed to linux-signed in Ubuntu. 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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
