linux-kernel - Re: [Intel-gfx] Intel graphics drm issue?

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Message-ID: <507AA469.5070100@cfl.rr.com>
Date:	Sun, 14 Oct 2012 07:39:21 -0400
From:	Mark Hounschell <dmarkh@....rr.com>
To:	Daniel Vetter <daniel@...ll.ch>
CC:	markh@...pro.net,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] Intel graphics drm issue?

On 10/14/2012 07:26 AM, Daniel Vetter wrote:
> On Sun, Oct 14, 2012 at 12:20 PM, Mark Hounschell <dmarkh@....rr.com> wrote:
>> Hi Daniel,
>>
>> cat /proc/cmdline
>> root=/dev/disk/by-id/ata-INTEL_SSDSC2CW060A3_CVCV205106EB060AGN-part4
>> video=1024x768 noresume splash=silent quiet apm=off nomodeset vga=normal
>> drm.debug=0xe
>>
>> dmesg is attached
>
>>>From the dmesg:
>
> [    1.833195] [drm:drm_pci_agp_init] *ERROR* Cannot initialize the
> agpgart module.
>
> Which is the root-cause preventing i915.ko from loading. Now with 3.7
> we /shouldn't/ all that agp crap any longer on snb/ivb, so I'm a bit
> confused why it still tries to initialize it. Can you maybe attach
> your .config?
>

Did you mean 3.6 above? I used 3.6.2? If I'm using the right kernel I will 
apply the patch and try. Let me know.

> Also, we need to employ some dirty runtime tricks to no longer require
> agp on newer chips, since we still need to keep it around for
> backwards-compat with old userspace on old chips. Can you please check
> with the below diff whether this hack works?
>
> Thanks, Daniel
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index a7837e5..1152502 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -842,6 +842,7 @@ i915_pci_probe(struct pci_dev *pdev, const struct
> pci_device_id *ent)
>          if (intel_info->gen != 3) {
>                  driver.driver_features &=
>                          ~(DRIVER_USE_AGP | DRIVER_REQUIRE_AGP);
> +               printk("dropping agp requirement\n");
>          } else if (!intel_agp_enabled) {
>                  DRM_ERROR("drm/i915 can't work without intel_agp module!\n");
>                  return -ENODEV;
>

Doesn't this patch only add a printk? Is that what you want me to do?

Mark

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