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SubjectRe: 2.6.30-rc1 (latest git): thinkpad-acpi: cannot control brightness with hotkeys (BISECTED)
On 04/15/2009 10:01 PM, Matthew Garrett wrote:
> On Wed, Apr 15, 2009 at 09:55:55PM +0200, Niel Lambrechts wrote:
>
>
>> The behaviour seems slightly different from before your 74a365b3f354
>> commit in that /sys/class/backlight remains empty until i915 gets loaded
>> for the first time, the contents then persist even if i915 is unloaded.
>> Perhaps the directory was populated by a different kernel module, since
>> when I did the bisect yesterday the directory would be there on boot
>> before I started X or loaded i915.
>>
>
> In the past the directory would be created when the acpi video driver
> was loaded, but probably wouldn't work. Doing it that way is a violation
> of the opregion spec and causes some machines to break in a horrible
> manner, so I'd prefer not to go back to that version...
>
Cool, I suspected it was intended behaviour... :)

So is there any chance of getting this fix merged any time soon (at
least before 2.6.30 is out)?

> If you use modesetting then you shouldn't need to launch X to get
> working brightness control. The problem with the old-style world is that
> you won't get interrupts until X comes up.

I'd love to use KMS, but I have no idea how to troubleshoot the freeze
I'm getting after the main gdm login screen. Or is there still a future
i915 milestone(s) to be reached before I can realistically do
i915.modeset=1, given the large amount of activity around this in recent
times?

Thanks for the help!
Niel


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