https://bugzilla.kernel.org/show_bug.cgi?id=202401
Bug ID: 202401
Summary: backlight control doesn't work without
acpi_backlight=vendor
Product: ACPI
Version: 2.5
Kernel Version: 4.19.12
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
The backlight brightness control doesn't work on my Sony Vaio model VPCEH3U1E.
As recommended on #nouveau I booted with acpi_backlight=vendor, and brightness
control works.
Here are my system informations:
# grep '.*' /sys/class/dmi/id/*_*
/sys/class/dmi/id/bios_date:11/17/2011
/sys/class/dmi/id/bios_vendor:INSYDE
/sys/class/dmi/id/bios_version:R0190Z9
/sys/class/dmi/id/board_asset_tag:N/A
/sys/class/dmi/id/board_name:VAIO
/sys/class/dmi/id/board_serial:N/A
/sys/class/dmi/id/board_vendor:Sony Corporation
/sys/class/dmi/id/board_version:N/A
/sys/class/dmi/id/chassis_asset_tag:N/A
/sys/class/dmi/id/chassis_serial:N/A
/sys/class/dmi/id/chassis_type:10
/sys/class/dmi/id/chassis_vendor:Sony Corporation
/sys/class/dmi/id/chassis_version:N/A
/sys/class/dmi/id/product_family:VAIO
/sys/class/dmi/id/product_name:VPCEH3U1E
/sys/class/dmi/id/product_serial:27553937-5000508
/sys/class/dmi/id/product_sku:N/A
/sys/class/dmi/id/product_uuid:4d10fca0-5077-11e1-8c17-78843cfdbff4
/sys/class/dmi/id/product_version:C106WAVW
/sys/class/dmi/id/sys_vendor:Sony Corporation
# ls /sys/class/backlight/
acpi_video0
nv_backlight
Setting the brightness using acpi_video0 doesn't work, but using nv_backlight
works.
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