linux-kernel - Kernel BUG with i915 in intel_sdvo_ddc_proxy

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Date:	Tue, 17 May 2011 14:05:32 +0200
From:	Mihai Moldovan <ionic@...ic.de>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Kernel BUG with i915 in intel_sdvo_ddc_proxy_func

Hi,

I'm having trouble with an integrated i915 card, KMS and Linux >2.6.36.

The bug has been introduced somewhere between 2.6.36.1 (working) and 
2.6.37 (bad) and is still happening on 2.6.38.6.

Kernel output (Images only, sorry):

http://ionic.de/gfx/Screenshots/Kernel/i915-BUG/Part1.jpg
http://ionic.de/gfx/Screenshots/Kernel/i915-BUG/Part2.jpg
http://ionic.de/gfx/Screenshots/Kernel/i915-BUG/Part3.jpg
http://ionic.de/gfx/Screenshots/Kernel/i915-BUG/Part4.jpg

lspci:

00:00.0 Host bridge: Intel Corporation 4 Series Chipset DRAM Controller 
(rev 03)
         Subsystem: Intel Corporation Device 1003
         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
         Capabilities: [e0] Vendor Specific Information: Len=0c <?>
         Kernel driver in use: agpgart-intel

00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset 
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
         Subsystem: Intel Corporation Device 1003
         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 50
         Region 0: Memory at e0000000 (64-bit, non-prefetchable) [size=4M]
         Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
         Region 4: I/O ports at f220 [size=8]
         Expansion ROM at <unassigned> [disabled]
         Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                 Address: fee0f00c  Data: 41c1
         Capabilities: [d0] Power Management version 2
                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

00:02.1 Display controller: Intel Corporation 4 Series Chipset 
Integrated Graphics Controller (rev 03)
         Subsystem: Intel Corporation Device 1003
         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
         Region 0: Memory at e0400000 (64-bit, non-prefetchable) [size=1M]
         Capabilities: [d0] Power Management version 2
                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

PCI:IDs for those devices:
00:00.0 0600: 8086:2e10 (rev 03)
         Subsystem: 8086:1003

00:02.0 0300: 8086:2e12 (rev 03) (prog-if 00 [VGA controller])
         Subsystem: 8086:1003

00:02.1 0380: 8086:2e13 (rev 03)
         Subsystem: 8086:1003

It only happens when I enable CONFIG_DRM_I915_KMS.

Also, as of 2.6.37, the video= Kernel parameter doesn't have any effect 
anymore (set to video=1280x1024-24@75). It's working fine on 2.6.36.1.

Do you need anything else? Feel free to request additional information.

I'm looking forward to hearing from you.

Best regards,


Mihai


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