** Description changed: - 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. + == SRU Justification == + Commit 78f3ac76d9e5 ("platform/x86: asus-wmi: Tell the EC the OS will + handle the display off hotkey") causes the backlight to be permanently off + on various EeePC laptop models using the eeepc-wmi driver (Asus EeePC + 1015BX, Asus EeePC 1025C). + + == Fix == + * 1dd93f87 (platform/x86: asus-wmi: Only Tell EC the OS will handle + display hotkeys from asus_nb_wmi) + + This patch addes a .wmi_backlight_set_devstate quirk for specific + models to make asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT, 2, NULL) + conditional. + + Only X/D contain the commit that introduce this issue (78f3ac76), this + patch can be cherry-picked into D. + + For X, it needs some content adjustment to add quirks only to those + models that exist in Xenial tree. + + == Test == + Test kernels could be found here: + https://people.canonical.com/~phlin/kernel/lp-1837117-eeepc/ + + Bug reporter has verified that this fix works as expected on X. + + == Regression Potential == + Low, quirks limited to specific ASUS laptops and by far there is no + further change to this in upstream kernel. + + + == Original Bug Report == + 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)
** Summary changed: - Laptop backlight is off after system boot up + EeePC 1005px laptop backlight is off after system boot up ** Changed in: linux (Ubuntu Disco) Status: New => In Progress ** Changed in: linux (Ubuntu Disco) Assignee: (unassigned) => Po-Hsu Lin (cypressyew) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1837117 Title: EeePC 1005px laptop backlight is off after system boot up To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837117/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs