https://bugzilla.kernel.org/show_bug.cgi?id=62881

Can Kavaklıoğlu <[email protected]> changed:

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--- Comment #2 from Can Kavaklıoğlu <[email protected]> ---
AaronLu, no, behavior is really interesting:

- boot computer from cold
- can adjust brightness fine at this point
- suspend to ram
- wake up
- try to adjust brightness, but there are only two brightness levels available:
100% or 0%.

In the problematic case /sys/class/backlight/acpi_video0/brightness reports the
correct values as brightness is changed. But backlight either goes zero or full
brightness.

This issue is reported in Arch, Ubuntu and Freedesktop:

https://bugs.freedesktop.org/show_bug.cgi?id=67454

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1197482

https://bbs.archlinux.org/viewtopic.php?id=165899&p=1

I am testing on a MacAir 6,2 (2013). Let me know if I can do any testing. I
will try with 3.12-rc5 right now and let you know about the results.

Thanks.

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