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: drivers_video-dri@kernel-bugs.osdl.org Reporter: iknstudio@protonmail.com 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.