** 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)
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https://bugs.launchpad.net/bugs/1837117
Title:
EeePC 1005px laptop backlight is off after system boot up
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