Re: [Update][PATCH] ACPI / video / i915: Remove ACPI backlight if firmware expects Windows 8

Igor Gnatenko
2013-07-17T05:16:44Z

On Wed, 2013-07-17 at 00:01 +0200, Rafael J. Wysocki wrote:
> On Tuesday, July 16, 2013 05:08:16 PM Matthew Garrett wrote:
> > On Tue, 2013-07-16 at 17:32 +0400, Igor Gnatenko wrote:
> > > Hmm. I found regression in user-space. In GNOME (maybe and other DEs) we no longer see switch status of backlight.
> >
> > Yeah, I can duplicate that. Rafael, we have to call
> > acpi_video_init_brightness() even if we're not going to initialise the
> > backlight - Thinkpads seem to use this as the trigger for enabling ACPI
> > notifications rather than handling it in firmware. This seems to do the
> > job:
>
> Igor, does this additional patch from Matthew help?
Yes. With this patch I have backlight switch indicator on my ThinkPad X230.
>
> Rafael
>
>
Tested-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>
> > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> > index 01b1a25..71865f7 100644
> > --- a/drivers/acpi/video.c
> > +++ b/drivers/acpi/video.c
> > @@ -900,6 +900,9 @@ static void acpi_video_device_find_cap(struct
> > acpi_video_device *device)
> > device->cap._DDC = 1;
> > }
> >
> > + if (acpi_video_init_brightness(device))
> > + return;
> > +
> > if (acpi_video_verify_backlight_support()) {
> > struct backlight_properties props;
> > struct pci_dev *pdev;
> > @@ -909,9 +912,6 @@ static void acpi_video_device_find_cap(struct
> > acpi_video_device *device)
> > static int count = 0;
> > char *name;
> >
> > - result = acpi_video_init_brightness(device);
> > - if (result)
> > - return;
> > name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
> > if (!name)
> > return;
> >
> >
> > --
> > Matthew Garrett | mjg59@srcf.ucam.org
> >
--
Igor Gnatenko
Fedora release 19 (Schrödinger’s Cat)
Linux 3.11.0-0.rc0.git7.1.fc20.x86_64

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