Summary: | [Backlight] Very slow response changing backlight on intel video | ||
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Product: | xorg | Reporter: | Matthew Gabeler-Lee <cheetah-freedesktop> |
Component: | Driver/intel | Assignee: | Chris Wilson <chris> |
Status: | RESOLVED NOTOURBUG | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
Severity: | normal | ||
Priority: | medium | ||
Version: | unspecified | ||
Hardware: | x86-64 (AMD64) | ||
OS: | All | ||
Whiteboard: | |||
i915 platform: | i915 features: |
Description
Matthew Gabeler-Lee
2013-12-22 02:31:24 UTC
I also tested using the intel_backlight on my system (instead of the dell_backlight), and it works properly too: Section "Device" Identifier "Intel Graphics" Driver "intel" Option "Backlight" "intel_backlight" EndSection It's yet another bug in the ACPI firmware. It has been decided that for Windows 8 machines that the ACPI layer is so typically buggy that the kernel will not expose the advertised ACPI backlight routines. But prior to that using the ACPI layer was the only universal way to control the backlight. (I have a few machines on which the backlight is not controlled by Intel's PWM.) Suffice to say, all I can other is the workaround, the root cause is elsewhere. |
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