https://bugzilla.kernel.org/show_bug.cgi?id=104121
Bug ID: 104121
Summary: Esprimo Mobile 9410: Two acpi_video* devices in sysfs,
only one working
Product: ACPI
Version: 2.5
Kernel Version: 4.2.0-0.rc5
Hardware: x86-64
OS: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 186931
--> https://bugzilla.kernel.org/attachment.cgi?id=186931&action=edit
acpidump of Esprimo Mobile M9410
Under /sys/class/backlight there are two entries:
[xxx@yyy ~]$ ls -l /sys/class/backlight/
lrwxrwxrwx. 1 root root 0 6. Sep 2015 acpi_video0 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
lrwxrwxrwx. 1 root root 0 6. Sep 2015 acpi_video1 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1
When writing manually a new value to acpi_video0/brightness the backlight is
not changing. Do the same with acpi_video1/brightness is changing the
backlight.
Both entries are of type firmware.
As a result, the backlight can not be changed from the gnome shell slider
(gnome 3.16), gsd-backlight-helper and xbacklight. xbacklight is working, when
acpi_video1 is defined as the backlight device in an xorg.conf.d file.
Here the output of all files in the acpi_video* folder. In addition I attache
an acpidump. If any additional information is needed, please let me know and I
try to get it.
[xxx@yyy ~]$ grep . -r /sys/class/backlight/*
/sys/class/backlight/acpi_video0/type:firmware
/sys/class/backlight/acpi_video0/brightness:4
/sys/class/backlight/acpi_video0/power/control:auto
/sys/class/backlight/acpi_video0/power/async:disabled
/sys/class/backlight/acpi_video0/power/runtime_enabled:disabled
/sys/class/backlight/acpi_video0/power/runtime_active_kids:0
/sys/class/backlight/acpi_video0/power/runtime_active_time:0
grep: /sys/class/backlight/acpi_video0/power/autosuspend_delay_ms:
Eingabe-/Ausgabefehler
/sys/class/backlight/acpi_video0/power/runtime_status:unsupported
/sys/class/backlight/acpi_video0/power/runtime_usage:0
/sys/class/backlight/acpi_video0/power/runtime_suspended_time:0
/sys/class/backlight/acpi_video0/bl_power:0
/sys/class/backlight/acpi_video0/max_brightness:10
/sys/class/backlight/acpi_video0/actual_brightness:4
/sys/class/backlight/acpi_video1/type:firmware
/sys/class/backlight/acpi_video1/brightness:7
/sys/class/backlight/acpi_video1/power/control:auto
/sys/class/backlight/acpi_video1/power/async:disabled
/sys/class/backlight/acpi_video1/power/runtime_enabled:disabled
/sys/class/backlight/acpi_video1/power/runtime_active_kids:0
/sys/class/backlight/acpi_video1/power/runtime_active_time:0
grep: /sys/class/backlight/acpi_video1/power/autosuspend_delay_ms:
Eingabe-/Ausgabefehler
/sys/class/backlight/acpi_video1/power/runtime_status:unsupported
/sys/class/backlight/acpi_video1/power/runtime_usage:0
/sys/class/backlight/acpi_video1/power/runtime_suspended_time:0
/sys/class/backlight/acpi_video1/bl_power:0
/sys/class/backlight/acpi_video1/max_brightness:7
/sys/class/backlight/acpi_video1/actual_brightness:7
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