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SubjectRe: [PATCH 2/3] ACPI / video: Always call acpi_video_init_brightness() on init
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From: Matthew Garrett <matthew.garrett@nebula.com>

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.

[rjw: Drop the brightness object created by
acpi_video_init_brightness() if we are not going to use it.]
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>
---
drivers/acpi/video.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/acpi/video.c
===================================================================
--- linux-pm.orig/drivers/acpi/video.c
+++ linux-pm/drivers/acpi/video.c
@@ -884,6 +884,9 @@ static void acpi_video_device_find_cap(s
if (acpi_has_method(device->dev->handle, "_DDC"))
device->cap._DDC = 1;

+ if (acpi_video_init_brightness(device))
+ return;
+
if (acpi_video_backlight_support()) {
struct backlight_properties props;
struct pci_dev *pdev;
@@ -893,9 +896,6 @@ static void acpi_video_device_find_cap(s
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;
@@ -955,6 +955,11 @@ static void acpi_video_device_find_cap(s
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\n");

+ } else {
+ /* Remove the brightness object. */
+ kfree(device->brightness->levels);
+ kfree(device->brightness);
+ device->brightness = NULL;
}
}

--
Igor Gnatenko
Fedora release 19 (Schrödinger’s Cat)
Linux 3.9.9-302.fc19.x86_64

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