linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Disable all outputs early, before KMS takeover

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Date:	Tue, 5 Apr 2011 13:21:08 +0300
From:	Tomas Winkler <tomasw@...il.com>
To:	Pekka Enberg <penberg@...nel.org>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel@...ll.ch>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Disable all outputs early, before
 KMS takeover

On Fri, Apr 1, 2011 at 2:51 PM, Pekka Enberg <penberg@...nel.org> wrote:
> On Fri, Apr 1, 2011 at 2:44 PM, Daniel Vetter <daniel@...ll.ch> wrote:
>> On Tue, Mar 29, 2011 at 11:46:29AM +0100, Chris Wilson wrote:
>>> If the outputs are active and continuing to access the GATT when we
>>> teardown the PTEs, then there is a potential for us to hang the GPU.
>>> The hang tends to be a PGTBL_ER with either an invalid host access or
>>> an invalid display plane fetch.
>>
>> This patch seems to fix resume flakiness (that recently developed
>> complete reliability in hanging the gpu) on my i855gm. Captured
>> error_states look as described here. Latest -staging merged into latest
>> -linus is now again fully reliable at s/r.
>>
>> Tested-by: Daniel Vetter <daniel.vetter@...ll.ch>
>
> Unfortunately I get a blank screen with after boot:
> Nacked-by: Pekka Enberg <penberg@...nel.org>

Not sure this is related, but when I enable DRM_I915_KMS=y I'm got
stuck after boot too. When KMS is disabled I can at least get to the
console (no graphics)
This is with kernel 2.6.39-rc1.  It worked fine with 2.6.38. I don't
have much time bisect and reboot.  Shell I  try to pull drm-fixes for
rc2 or use try this patch?


lspci -vv
00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
	Subsystem: Intel Corporation Device 0036
	Flags: bus master, fast devsel, latency 0, IRQ 42
	Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	I/O ports at f160 [size=8]
	Expansion ROM at <unassigned> [disabled]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

Thanks
Tomas
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