linux-kernel - Re: [PATCH] Revert "ACPI / video: Add HP EliteBook Revolve 810 to the blacklist"

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Date:	Fri, 14 Feb 2014 14:37:00 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>, Aaron Lu <aaron.lu@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "ACPI / video: Add HP EliteBook Revolve 810 to the blacklist"

At Fri, 14 Feb 2014 14:34:07 +0200,
Mika Westerberg wrote:
> 
> This reverts commit e18ac62fa4b3f16234bab0d5a6627c57dbae9e7e.
> 
> The referenced commit added HP EliteBook Revolve 810 to the ACPI video
> detected blacklist so that only the native Intel backlight interface was
> exported.
> 
> However, this turned to be wrong solution after all. The ACPI video
> interface works and as long as we only use that there are no problems. So
> we can revert this commit and stick to use the backlight interface provided
> by the ACPI video driver.
> 
> (Using Intel native interface will not work after resume since the ACPI
> video driver will restore it's state which takes control over the native
> one. That's a separate thing and should be addressed in the ACPI video
> driver, I suppose.)
> 
> References: https://bugzilla.kernel.org/show_bug.cgi?id=70231
> Cc: Aaron Lu <aaron.lu@...el.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
> Rafael, 
> 
> This turned out to be misunderstanding from my side. I should have
> investigated this further before submitting the original patch. Sorry about
> that.
> 
> Aaron,
> 
> Thanks for the investigation and pointing me to the right direction (e.g to
> use acpi_video0 over the native one).

Could you check whether the ACPI video still really works even if you
remove the recent acpi_osi blacklist entry below?  It might be that
BIOS changed its mind to behave more kindly as if handling for Win7.


Takashi

---
diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
index 10e4964d051a..64d14406465d 100644
--- a/drivers/acpi/blacklist.c
+++ b/drivers/acpi/blacklist.c
@@ -322,6 +322,7 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
 		     DMI_MATCH(DMI_PRODUCT_VERSION, "2349D15"),
 		},
 	},
+#if 0
 	{
 	.callback = dmi_disable_osi_win8,
 	.ident = "HP ProBook 2013 models",
@@ -372,6 +373,7 @@ static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
 		     DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8780w"),
 		},
 	},
+#endif
 
 	/*
 	 * BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
--
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