linux-kernel - Re: Linux 3.11-rc2

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Date:	Mon, 22 Jul 2013 14:21:37 +0100
From:	James Hogan <james@...anarts.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kamal Mostafa <kamal@...onical.com>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Steven Newbury <steve@...wbury.org.uk>
Subject: Re: Linux 3.11-rc2

On 22 July 2013 14:02, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Monday, July 22, 2013 12:08:40 AM James Hogan wrote:
>> On 21 July 2013 20:53, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>> >  (b) we had a late change to how ACPI backlight handling is done on
>> > certain machines, and while this kind of thing really shouldn't be
>> > done outside the merge window, I ended up pulling it anyway. But I'd
>> > *really* like to have people test this thing particularly on laptops
>> > with intel-based graphics. It should only matter (and hopefully
>> > improve things) for the newer ones with BIOSes designed for Windows 8,
>> > but hey, the more testing, the better. Backlight handling has beenin
>> > painful before, so I'm mentioning this explicitly.
>>
>> 8c5bd7a "ACPI / video / i915: No ACPI backlight if firmware expects
>> Windows 8" breaks backlight control for me because
>> /sys/class/backlight/acpi_video0 disappears, and
>> /sys/class/backlight/intel_backlight doesn't seem to have any effect.
>>
>> Note that acpi_video0 only worked because I was applying "[PATCH]
>> drm/i915: quirk no PCH_PWM_ENABLE for Dell XPS13 backlight" [1], so
>> strictly speaking mainline already didn't work.
>
> James, sorry for breaking things for you.  The patch you're mentioning is going
> to hit the mainline at one point anyway I suppose.
>
> In the meantime I received a report from Steven Newbury that these changes
> broke things for him too, so we need to revert commits 8c5bd7a and efaa14c.
> The other two commits in the series should be benign.

Feel free to Cc me on updated versions of the patches if you'd like me to test.

Cheers
James
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