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Monq
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Joined: 11 Feb 2011
Posts: 41
Location: Spain
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 Posted: Sun Dec 10, 2017 12:04 pm Post subject: nvidia-drivers removes /sys/class/backlight/acpi_video0 |
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I use a custom ACPI DSDT table and I boot with acpi_backlight=video so the system creates a /sys/class/backlight/acpi_video0 folder. That one works, because /sys/class/backlight/intel_backlight doesn't.
Unfortunately since I installed nvidia-drivers, /sys/class/backlight/acpi_video0 is no longer created by the system. Only intel_backlight appears there, which doesn't work. |
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Monq
n00b
Joined: 11 Feb 2011
Posts: 41
Location: Spain
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| Posted: Sun Dec 10, 2017 12:34 pm Post subject: |
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I've found that adding this option:
| Code: | | Option "RegistryDwords" "EnableBrightnessControl=1" |
To the device section of the Nvidia card fixes part of the problem: the acpi_video0 directory remains there.
But xbacklight no longer works because, I presume, xrandr thinks intel_backlight is the correct way of changing the brightness of my screen. When I was using the intel driver, I could choose the other backlight control with this option:
| Code: | | Option "Backlight" "acpi_video0" |
But it looks like that option is only supported by the intel driver, and not nvidia's.
I was reading the relevant code and it doesn't look like there's any command line option that I could pass to the kernel so it doesn't create the intel_backlight directory. |
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Kernel & Hardware
