linux-kernel - Re: [PATCH] Fix i915 drm regression on AOpen i915GMm-HFS motherboard

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Message-ID: <4D22119B.9050007@t-online.de>
Date:	Mon, 03 Jan 2011 19:12:43 +0100
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	Chris Wilson <chris@...is-wilson.co.uk>
CC:	airlied@...ux.ie, eric@...olt.net, jesse.barnes@...el.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	intel-gfx <intel-gfx@...ts.freedesktop.org>, gregkh@...e.de
Subject: Re: [PATCH] Fix i915 drm regression on AOpen i915GMm-HFS motherboard

Am 03.01.2011 15:54, schrieb Chris Wilson:

I tried 2.6.37-rc8-git2 with both patches applied.

Well, your patch does not hurt, the system runs fine. But my patch is
still needed as the intel_no_lvds_dmi_callback is called:

<6>[    2.131481] agpgart-intel 0000:00:00.0: Intel 915GM Chipset
<6>[    2.131668] agpgart-intel 0000:00:00.0: detected gtt size: 262144K
total, 262144K mappable
<6>[    2.132594] agpgart-intel 0000:00:00.0: detected 8192K stolen memory
<6>[    2.135338] agpgart-intel 0000:00:00.0: AGP aperture is 256M @
0xc0000000
<6>[    2.135551] [drm] Initialized drm 1.1.0 20060810
<6>[    2.135703] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) ->
IRQ 16
<7>[    2.135843] i915 0000:00:02.0: setting latency timer to 64
<7>[    2.139787] [drm:parse_general_definitions], crt_ddc_bus_pin: 2
<7>[    2.139824] [drm:parse_lfp_panel_data], Found panel mode in BIOS
VBT tables:
<7>[    2.139827] [drm:drm_mode_debug_printmodeline], Modeline
0:"1024x768" 0 65000 1024 1048 1184 1344 768 771 777 806 0x8 0xa
<7>[    2.139899] [drm:parse_sdvo_device_mapping], the SDVO device with
slave addr 70 is found on SDVOB port
<7>[    2.139903] [drm:parse_sdvo_device_mapping], SDVO device: dvo=1,
addr=70, wiring=1, ddc_pin=29, i2c_pin=5, i2c_speed=83
<7>[    2.139909] [drm:parse_sdvo_device_mapping], the SDVO device with
slave addr 72 is found on SDVOC port
<7>[    2.139913] [drm:parse_sdvo_device_mapping], SDVO device: dvo=2,
addr=72, wiring=0, ddc_pin=29, i2c_pin=5, i2c_speed=32
<7>[    2.139970] [drm:intel_modeset_init], 2 display pipes available.
<7>[    2.139977] [drm:intel_crtc_init], swapping pipes & planes for FBC
<7>[    2.139984] [drm:intel_crtc_init], swapping pipes & planes for FBC
<7>[    2.139990] [drm:intel_no_lvds_dmi_callback], Skipping LVDS
initialization for AOpen motherboard i915GMm-HFS



> On Mon, 03 Jan 2011 15:25:05 +0100, Knut Petersen <Knut_Petersen@...nline.de> wrote:
>   
>> The AOpen i915GMm-HFS is a desktop motherboard for the Intel Pentium M.
>> A mobile chipset is used
>> (Intel 915GM / ICH6-M). Kernel 2.6.31.14 works fine for that mobo, but
>> from 2.6.32 on graphics support
>> is broken because the i915 driver "detects" an lvds device with a
>> resolution of 1024x768 pixels that in reality
>> is not present. Unfortunately the driver assumes that the "detected"
>> lvds is the primary screen and uses the
>> wrong resolution also for the real VGA and DVI connectors.
>>     
> Can you try:
>
> diff --git a/drivers/gpu/drm/i915/intel_i2c.c
> b/drivers/gpu/drm/i915/intel_i2c.c
> index 58040f6..111128d 100644
> --- a/drivers/gpu/drm/i915/intel_i2c.c
> +++ b/drivers/gpu/drm/i915/intel_i2c.c
> @@ -384,7 +384,7 @@ int intel_setup_gmbus(struct drm_device *dev)
>                 bus->reg0 = i | GMBUS_RATE_100KHZ;
>  
>                 /* XXX force bit banging until GMBUS is fully debugged */
> -               bus->force_bit = intel_gpio_create(dev_priv, i);
> +               //bus->force_bit = intel_gpio_create(dev_priv, i);
>         }
>  
>         intel_i2c_reset(dev_priv->dev);
> -Chris
>
>   

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