https://bugzilla.kernel.org/show_bug.cgi?id=208661
Bug ID: 208661
Summary: Backlight doesn't work with both nv_backlight and
acpi_video
Product: Drivers
Version: 2.5
Kernel Version: 5.7.0-1-amd64
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 290457
--> https://bugzilla.kernel.org/attachment.cgi?id=290457&action=edit
vbios.rom
Hi,
I'm trying to get backlight working on this laptop. I am using the nouveau
driver, and kernel 5.7.
I tried a few different parameters for acpi_osi=, like the following:
- acpi_osi=linux
- acpi_osi=! acpi_osi="Windows 2012"
- acpi_osi=! acpi_osi="Windows 2015"
however, none of them worked. /sys/class/backlight/*/bl_power is 0 for both
devices at boot. acpi_video0 has a max_brightness of 10 while nv_backlight has
a max brightness of 100.
I am attaching the vbios. The graphics card is nVidia GT540M.
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