Regression in linux-image-3.11
Hello,
I do have an issue with the new 3.11.8-1~bpo70+1 image that wasn't
present in the old 3.10.11-1~bpo70+1 - the external monitor isn't
detected anymore, neither in console nor in X mode.
The issue is not 100% reproducible - monitor was detected once in about
5 boots. I thought variance was due to cold/warm boot, but it isn't.
In one of the "failed" boot, I noticed a "Duplicate ACPI video bus
devices for the same VGA controller, please try module parameter
"video.allow_duplicates=1"if the current driver doesn't work." Never
noticed it with 3.10, but that doesn't mean it wasn't there. I haven't
tried that option yet.
Setup:
Dell E6400 (core 2 duo) connected to a full HD monitor over DisplayPort.
Relevant part of lspci -vv (with kernel 3.10 running)
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
Controller Hub (rev 07)
Subsystem: Dell Device 0233
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=0a <?>
Kernel driver in use: agpgart-intel
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Dell Device 0233
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 47
Region 0: Memory at f6c00000 (64-bit, non-prefetchable) [size=4M]
Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 4: I/O ports at ef70 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Address: fee0300c Data: 4162
Capabilities: [d0] Power Management version 3
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
Kernel driver in use: i915
I understand that I'm not providing all the necessary info, but I'm a
bit unsure about what the necessary info are.
TIA,
Jean-Marc Ranger
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