linux-kernel - Re: [BUG] 2.6.30-rc4: compile fail with CONFIG_DRM

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Date:	Sat, 02 May 2009 09:51:31 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Lee <lee-in-berlin@....de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] 2.6.30-rc4: compile fail with CONFIG_DRM_I915=y

Lee wrote:
> Hi list,
> 
> compiling 2.6.30-rc4 with following options will result in an compile
> error:
> 
> CONFIG_DRM_I915=y
> CONFIG_ACPI_VIDEO=m
> 
> 
> drivers/video/backlight/backlight.c: In function
> ‘backlight_device_register’:
> drivers/video/backlight/backlight.c:247: warning: format not a string
> literal and no format arguments
> drivers/video/output.c: In function ‘video_output_register’:
> drivers/video/output.c:99: warning: format not a string literal and no
> format arguments
> drivers/usb/storage/libusual.c: In function ‘usu_probe_thread’:
> drivers/usb/storage/libusual.c:159: warning: format not a string literal
> and no format arguments
> drivers/built-in.o: In function `intel_opregion_free':
> (.text+0xaf051): undefined reference to `acpi_video_exit'
> drivers/built-in.o: In function `intel_opregion_init':
> (.text+0xaf411): undefined reference to `acpi_video_register'
> make[1]: *** [.tmp_vmlinux1] Error 1
> make[1]: Leaving directory `/home/randall/kernel-source'
> make: *** [debian/stamp/build/kernel] Error 2
> 
> Compiling the kernel with both options as module or both options
> built-in results in a working kernel.

Len Brown posted a patch to fix this, although I can't find it in
any email archives just now, so I'm appending it below.


-- 

From: Len Brown <len.brown@...el.com>
Subject: [PATCH] ACPI, i915: build fix

drivers/built-in.o: In function `intel_opregion_init':
(.text+0x9d540): undefined reference to `acpi_video_register'

Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/gpu/drm/Kconfig |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 3a22eb9..f33d252 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -83,6 +83,12 @@ config DRM_I915
 config DRM_I915_KMS
 	bool "Enable modesetting on intel by default"
 	depends on DRM_I915
+	# i915 KMS 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 BACKLIGHT_CLASS_DEVICE if ACPI
+	select INPUT if ACPI
+	select ACPI_VIDEO if ACPI
 	help
 	  Choose this option if you want kernel modesetting enabled by default,
 	  and you have a new enough userspace to support this. Running old
-- 
--
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