From: bugzilla-daemon@bugzilla.kernel.org
To: platform-driver-x86@vger.kernel.org
Subject: [Bug 214899] New: ideapad-laptop: platform backlight device not working
Date: Sun, 31 Oct 2021 19:28:04 +0000 [thread overview]
Message-ID: <bug-214899-215701@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=214899
Bug ID: 214899
Summary: ideapad-laptop: platform backlight device not working
Product: Drivers
Version: 2.5
Kernel Version: 5.10.27-5.14.15
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Platform_x86
Assignee: drivers_platform_x86@kernel-bugs.osdl.org
Reporter: johannes.penssel@gmail.com
Regression: No
Created attachment 299379
--> https://bugzilla.kernel.org/attachment.cgi?id=299379&action=edit
DSDT.dsl
Hardware: Lenovo IdeaPad 5 15ITL05, latest BIOS version
Issue: Platform backlight device provided by ideapad-laptop has no effect on
actual brightness.
Pressing brightness keys on my keyboard causes changes in
/sys/class/backlight/ideapad/actual_brightness, but no uevent is generated (as
outlined in drivers/video/backlight.c source code comments), and
/sys/class/backlight/ideapad/brightness is unaffected.
When manipulating /sys/class/backlight/ideapad/brightness directly, uevents are
being generated, but no change in real screen brightness occurs.
The only way that screen brightness can actually be changed is by using i915's
intel_backlight sysfs interface, which does not respond to brightness keyboard
keys.
attached is my decompiled DSDT and dmesg.
ls -la /sys/class/backlight/ideapad/
total 0
drwxr-xr-x 3 root root 0 Oct 31 19:40 .
drwxr-xr-x 3 root root 0 Oct 31 19:40 ..
-r--r--r-- 1 root root 4096 Oct 31 19:40 actual_brightness
-rw-r--r-- 1 root root 4096 Oct 31 19:40 bl_power
-rw-rw-r-- 1 root video 4096 Oct 31 19:43 brightness
lrwxrwxrwx 1 root root 0 Oct 31 19:40 device -> ../../../VPC2004:00
-r--r--r-- 1 root root 4096 Oct 31 19:40 max_brightness
drwxr-xr-x 2 root root 0 Oct 31 19:40 power
-r--r--r-- 1 root root 4096 Oct 31 19:40 scale
lrwxrwxrwx 1 root root 0 Oct 31 19:40 subsystem ->
../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 Oct 31 19:40 type
-rw-r--r-- 1 root root 4096 Oct 31 19:40 uevent
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next reply other threads:[~2021-10-31 19:28 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-31 19:28 bugzilla-daemon [this message]
2021-11-01 19:35 ` [Bug 214899] ideapad-laptop: platform backlight device not working bugzilla-daemon
2021-11-01 20:33 ` bugzilla-daemon
2021-11-01 21:22 ` bugzilla-daemon
2021-11-01 22:17 ` bugzilla-daemon
2021-11-01 22:34 ` bugzilla-daemon
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2021-11-02 22:06 ` bugzilla-daemon
2021-11-02 22:15 ` bugzilla-daemon
2021-11-04 21:22 ` bugzilla-daemon
2021-11-15 14:28 ` bugzilla-daemon
2022-02-17 1:20 ` [Bug 214899] ideapad-laptop: brightness hotkeys " bugzilla-daemon
2022-02-17 1:21 ` bugzilla-daemon
2022-04-12 18:45 ` bugzilla-daemon
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