linux-kernel - Re: i915: Dell E6410 Ironlake LVDS detection

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Message-ID: <AANLkTim6IiHbd6tN6bfS2kppRPaIzoGLC6nAl5IF3dOj@mail.gmail.com>
Date:	Wed, 23 Jun 2010 14:29:44 -0400
From:	Ben Guthro <ben@...hro.net>
To:	Philippe Troin <phil@...i.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: i915: Dell E6410 Ironlake LVDS detection

On Wed, Jun 23, 2010 at 2:11 PM, Philippe Troin <phil@...i.org> wrote:
> Ben Guthro <ben@...hro.net> writes:
>
>> On Wed, Jun 23, 2010 at 1:42 PM, Philippe Troin <phil@...i.org> wrote:
>> > I am seeing similar problems with an HP Elitebook 2540p.
>> >
>> > 2.6.32 works for me.
>> > 2.6.33.5 does not.
>>
>> I have tried ubuntu mainline builds of:
>>
>> 2.6.32.21
>> 2.6.32.22
>> 2.6.34-rc3
>> 2.6.35-rc1
>> 2.6.34-drm-intel-next
>>
>> None have worked yet...
>
> Tried a vanilla kernel?

Yes, both mainline, and the drm-intel branch. Both boot to the black screen,

>
>> > I was able to turn on an external display connected via VGA with
>> > xrandr and it seemed to be working fine?
>>
>> When I boot without the external display, I am never able to ssh in -
>> and I do not get the sound that typically plays when X is booted.
>>
>> I've put this onto a serial line, and it seems to hang sometime in
>> init...with some indicators that it is when it switches over to the
>> higher resolution console...but the screen is black, so this is really
>> just a gut feel.
>
> Then it might be a different problem.  For me, X definitely boots.
>
> Can you boot with nomodeset?

It seemed to reboot the system at some point in the boot process (panic?)

> What does lspci report for you?


00:02.0 VGA compatible controller: Intel Corporation Core Processor
Integrated Graphics Controller (rev 02)
	Subsystem: Dell Device 040a
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 45
	Region 0: Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at 40b0 [size=8]
	Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable+
		Address: fee0a00c  Data: 4191
	Capabilities: [d0] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [a4] PCIe advanced features <?>
	Kernel driver in use: i915
	Kernel modules: i915



I booted with the external VGA connected, and drm.debug=0x06, and got
the following message that looked interesting:

[    9.203990] [drm:intel_lvds_init], LVDS is not present in VBT


I'm not sure why yet....but it seems like a reasonable string to pull on...
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