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Date: Wed, 21 Mar 2012 11:00:45 +0800
From: joeyli <jlee@...e.com>
To: Pradeep Subrahmanion <subrahmanion.pradeep@...il.com>
Cc: Matthew Garrett <mjg@...hat.com>, rpurdie@...ys.net,
FlorianSchandinat@....de, akpm@...ux-foundation.org,
linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Added backlight driver for Acer Aspire 4736
於 三，2012-03-21 於 00:25 +0530，Pradeep Subrahmanion 提到：
> > >From 5da43d2ee6c87dcf17fda34f0b50fe11b04a16bf Mon Sep 17 00:00:00 2001
> > From: "Lee, Chun-Yi" <jlee@...e.com>
> > Date: Tue, 20 Mar 2012 19:00:58 +0800
> > Subject: [PATCH] acer-wmi: add quirk table for video backlight vendor mode
> >
> > There have some acer laptop have broken _BCM implemenation, the AML
> > code wrote value to EC register but firmware didn't change brighenss.
> >
> > Fortunately, the brightness control works on those machines with
> > vendor mode. So, add quirk table for video backlight vendor mode
> > and unregister acpi video interface on those machines.
> >
> > Tested on Acer TravelMate 4750
> >
> > Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
> > ---
> > drivers/platform/x86/Kconfig | 4 ++++
> > drivers/platform/x86/acer-wmi.c | 38 +++++++++++++++++++++++++++++++++++---
> > 2 files changed, 39 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
> > index 15dbd8c..fe3a494 100644
> > --- a/drivers/platform/x86/Kconfig
> > +++ b/drivers/platform/x86/Kconfig
> > @@ -26,6 +26,10 @@ config ACER_WMI
> > depends on RFKILL || RFKILL = n
> > depends on ACPI_WMI
> > select INPUT_SPARSEKMAP
> > + # Acer WMI depends on ACPI_VIDEO when ACPI is enabled
> > + # but for select to work, need to select ACPI_VIDEO's dependencies, ick
> > + select VIDEO_OUTPUT_CONTROL if ACPI
> > + select ACPI_VIDEO if ACPI
> > ---help---
> > This is a driver for newer Acer (and Wistron) laptops. It adds
> > wireless radio and bluetooth control, and on some laptops,
> > diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> > index 1e5290b..984a7b5 100644
> > --- a/drivers/platform/x86/acer-wmi.c
> > +++ b/drivers/platform/x86/acer-wmi.c
> > @@ -43,6 +43,7 @@
> > #include <linux/input/sparse-keymap.h>
> >
> > #include <acpi/acpi_drivers.h>
> > +#include <acpi/video.h>
> >
> > MODULE_AUTHOR("Carlos Corbacho");
> > MODULE_DESCRIPTION("Acer Laptop WMI Extras Driver");
> > @@ -478,6 +479,33 @@ static struct dmi_system_id acer_quirks[] = {
> > {}
> > };
> >
> > +static int video_set_backlight_video_vendor(const struct dmi_system_id *d)
> > +{
> > + interface->capability &= ~ACER_CAP_BRIGHTNESS;
> > + pr_info("Brightness must be controlled by generic video driver\n");
> > + return 0;
> > +}
> > +
> > +static const struct dmi_system_id video_vendor_dmi_table[] = {
> > + {
> > + .callback = video_set_backlight_video_vendor,
> > + .ident = "Acer Aspire 4736",
> > + .matches = {
> > + DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
> > + DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4736"),
> > + },
> > + },
> > + {
> > + .callback = video_set_backlight_video_vendor,
> > + .ident = "Acer TravelMate 4750",
> > + .matches = {
> > + DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
> > + DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
> > + },
> > + },
> > + {}
> > +};
> > +
> > /* Find which quirks are needed for a particular vendor/ model pair */
> > static void find_quirks(void)
> > {
> > @@ -1981,9 +2009,13 @@ static int __init acer_wmi_init(void)
> > set_quirks();
> >
> > if (acpi_video_backlight_support()) {
> > - interface->capability &= ~ACER_CAP_BRIGHTNESS;
> > - pr_info("Brightness must be controlled by "
> > - "generic video driver\n");
> > + if (dmi_check_system(video_vendor_dmi_table)) {
> > + acpi_video_unregister();
> > + } else {
> > + interface->capability &= ~ACER_CAP_BRIGHTNESS;
> > + pr_info("Brightness must be controlled by "
> > + "acpi video driver\n");
> > + }
> > }
> >
> > if (wmi_has_guid(WMID_GUID3)) {
>
> I tried out applied your patch . Boot message shows ,
>
> [11.220410] acer_wmi: Brightness must be controlled by generic video
> driver
>
> Now 'acpi_video0' and 'intel_backlight' are present
> inside /sys/class/backlight .Hot key works like earlier ( ie problem
> after maximum level still exists).
> I tried following commands ,
>
It's not the expected behavior.
This new patch should remove acpi_video0 interface on your machine.
Please kindly provide your dmidecode:
dmidecode > dmidecode.log
And,
please make should the patch really applied, you can do a bit change on
pr_info message by yourself.
> echo 5 > /sys/class/backlight/acpi_video0/brightness
> echo 5 > /sys/class/backlight/intel_backlight/brightness
>
> But it doesn't make any change .
>
> In my case , 'acpi_backlight = vendor' does not make any difference since the hot key control
>
> already starts working with 'acpi_osi=Linux' option.
>
> cat /proc/cmdline gives ,
>
> BOOT_IMAGE=/boot/vmlinuz-3.3.0+
> root=UUID=f0197a59-c067-4fd8-ad90-c4d721816077 ro acpi_osi=Linux
>
>
> Thanks ,
>
> Pradeep Subrahmanion
>
OK, that's more clearly, please remove acpi_osi=Linux then re-test, I
think the hotkey of backlight control only works with acpi_osi=Linux ?
Thanks a lot!
Joey Lee
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