linux-kernel - Re: [BUG] i915 boot got black screen with 2.6.37-rc5+

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Date:	Fri, 17 Dec 2010 14:27:28 +0800
From:	Hui Zhu <teawater@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	linux-kernel@...r.kernel.org, keithp@...thp.com,
	ak@...ux.intel.com, gregkh@...e.de, stable@...nel.org,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [BUG] i915 boot got black screen with 2.6.37-rc5+

Still black screen.

Cannot get the log from /var/log and cannot connect the pc through
net.   So I didn't get the log.  Sorry for that.

Thanks,
Hui

On Thu, Dec 16, 2010 at 18:10, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Thu, 16 Dec 2010 10:20:57 +0800, Hui Zhu <teawater@...il.com> wrote:
>> On Wed, Dec 15, 2010 at 18:20, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>> > On Wed, 15 Dec 2010 17:28:45 +0800, Hui Zhu <teawater@...il.com> wrote:
>> >> lspci | grep Display
>> >> 00:02.1 Display controller: Intel Corporation 82Q35 Express Integrated
>> >> Graphics Controller (rev 02)
>> >
>> > Q35. I wasn't expecting that. Can you please add drm.debug=0xe to your
>> > boot line and attach the dmesg from rc3 and rc5? Thanks.
>> > -Chris
>> >
>> > --
>> > Chris Wilson, Intel Open Source Technology Centre
>> >
>>
>> Thanks Chris.
>>
>> I post the logs of rc3+, rc4+ and rc5+ in attchement.  Wish they can
>> be more helpful.
>
> The hotplug probe was failing. The only change along that path I could see
> was to setting some hotplug flags in the analag adapter register. Can you
> try this patch to see if it fixes things for you? Meanwhile I'll check the
> docs for the validity of those flags for the various gen.
>
> diff --git a/drivers/gpu/drm/i915/intel_crt.c
> b/drivers/gpu/drm/i915/intel_crt.c
> index 8df5743..14c276e 100644
> --- a/drivers/gpu/drm/i915/intel_crt.c
> +++ b/drivers/gpu/drm/i915/intel_crt.c
> @@ -148,7 +148,9 @@ static void intel_crt_mode_set(struct drm_encoder *encoder,
>                           dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
>        }
>
> -       adpa = ADPA_HOTPLUG_BITS;
> +       adpa = 0;
> +       if (INTEL_INFO(dev)->gen >= 4)
> +               adpa |= ADPA_HOTPLUG_BITS;
>        if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
>                adpa |= ADPA_HSYNC_ACTIVE_HIGH;
>        if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
>
> --
> Chris Wilson, Intel Open Source Technology Centre
>
--
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