Date:	Sat, 13 Oct 2012 14:57:00 -0400
From:	Mark Hounschell <dmarkh@....rr.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
CC:	markh@...pro.net, linux-kernel@...r.kernel.org,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Subject: Re: Intel graphics drm issue?

Hi Bruno,

Thanks for the response.

On 10/12/2012 05:14 PM, Bruno Prémont wrote:
> Hi Mark,
>
> [CCing intel-gfx]
>
> On Fri, 12 October 2012 Mark Hounschell <markh@...pro.net> wrote:
>> Not sure this is the correct place to ask about a possible drm issue. I
>> have an intel based PC with an HDMI port that I'm trying to connect to
>> an LG TV. I have successfully used this HDMI port connected to an Optima
>> projector. Using that projector, everything from the BIOS post, BIOS
>> configuration, and all the way up to a graphical login worked just fine.
>> The same HDMI port and cable connected to this TV gives me the below
>> messages during boot. I also get no BIOS post or BIOS configuration
>> output while in the BIOS. I have a monitor connected to the DVI port so
>> I can see what I should see on the TV there, just as when I was
>> connected to the Optima projector. That alone makes me pretty sure it's
>> not a kernel issue but here are the messages anyway. Maybe they will
>> give someone a hint as to what the problem may be, in the case they
>> might be willing to give me any pointers.
>>
>> TV - LG 42lb9df
>> PC - intel DH77DF motherboard
>
>> [    0.000000] Linux version 3.4.10-lcrs (root@...xbox) (gcc version 4.7.1 20120723 [gcc-4_7-branch revision 189773] (SUSE Linux) ) #1 SMP PREEMPT Wed Oct 10 16:16:16 EDT 2012
>> ...
>> [    1.897955] [drm] MTRR allocation failed.  Graphics performance may suffer.
>> [    1.898045] i915 0000:00:02.0: irq 43 for MSI/MSI-X
>> [    1.898050] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
>> [    1.898051] [drm] Driver supports precise vblank timestamp query.
>> [    1.898084] [drm:intel_dsm_platform_mux_info] *ERROR* MUX INFO call failed
>> [    1.898737] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
>> [    1.995523] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off
>> [    2.299535] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 128
>> [    2.299865] Raw EDID:
>> [    2.299957]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.300188]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.300418]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.300648]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.300879]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.301109]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.301339]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>> [    2.301569]          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>
> This looks like your LG TV either does not provide EDID information via HDMI
> connector, or otherwise behaves in a special way which makes reading EDID
> fail.
>
> Did you try the TV on some other computer to check if EDID can be read there
> (e.g. with nvidia/amd GPU and matching open/closed driver)?
>
> Also make sure the TV is on (neither off nor on stand-by) as some TVs
> disable too much of connector interface in those states.
>

I have another AMD based PC here with an nvidia card and HDMI port. Using 
the nvidia driver, it boots up with no output to the tv until X starts. 
Once X starts I get my kdm login screen. All is well except the resolution 
is 800x600 and I have no VTs. I suspect if I had a properly configured 
xorg.conf file, my resolution would be what I defined in it and work.

Using the nouveau driver, I get nothing but "no signal" on the tv.  Just 
like the the intel box, except no EDID messages in the log file. I've 
attached a dmesg outputs for each config.

Back on the Intel machine. I boot up with a normal monitor connected to the 
DVI port of the PC. Then at the kdm login screen, I disconnect the DVI 
cable from the PC and connect the TV to the PCs DVI port using a DVI/HDMI 
adapter. I get a beautiful 1600x1200 resolution screen on the TV. This does 
not happen using the PC HDMI port.

I have no control over the tv with regards to stand-by mode. Off is standby 
mode, on is on.

>> [    2.434378] i915 0000:00:02.0: HDMI-A-3: EDID block 0 invalid.
>> [    2.477539] checking generic (e0000000 3ff0000) vs hw (e0000000 10000000)
>> [    2.477541] fb: conflicting fb hw usage inteldrmfb vs VESA VGA - removing generic driver
>> [    2.477549] Console: switching to colour dummy device 80x25
>> [    2.477831] fbcon: inteldrmfb (fb0) is primary device
>> [    2.637915] Console: switching to colour frame buffer device 128x48
>> [    2.679625] fb0: inteldrmfb frame buffer device
>> [    2.679626] drm: registered panic notifier
>> [    2.691536] acpi device:4b: registered as cooling_device9
>> [    2.691660] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:00/input/input4
>> [    2.691698] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
>> [    2.691709] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
>
>> geexbox:/home/mplayer # lspci
>> 00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller (rev 09)
>> ...
>> 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
>> ...
>
> Note, usually `lspci -nn` is more informative as it also provides vendor/device
> IDs in addition to nice names.

# lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core 
processor DRAM Controller [8086:0150] (rev 09)
00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core 
processor PCI Express Root Port [8086:0151] (rev 09)
00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 
v2/3rd Gen Core processor Graphics Controller [8086:0162] (rev 09)
00:14.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series 
Chipset Family USB xHCI Host Controller [8086:1e31] (rev 04)
00:16.0 Communication controller [0780]: Intel Corporation 7 Series/C210 
Series Chipset Family MEI Controller #1 [8086:1e3a] (rev 04)
00:19.0 Ethernet controller [0200]: Intel Corporation 82579V Gigabit 
Network Connection [8086:1503] (rev 04)
00:1a.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series 
Chipset Family USB Enhanced Host Controller #2 [8086:1e2d] (rev 04)
00:1c.0 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset 
Family PCI Express Root Port 1 [8086:1e10] (rev c4)
00:1c.7 PCI bridge [0604]: Intel Corporation 7 Series/C210 Series Chipset 
Family PCI Express Root Port 8 [8086:1e1e] (rev c4)
00:1d.0 USB controller [0c03]: Intel Corporation 7 Series/C210 Series 
Chipset Family USB Enhanced Host Controller #1 [8086:1e26] (rev 04)
00:1f.0 ISA bridge [0601]: Intel Corporation H77 Express Chipset LPC 
Controller [8086:1e4a] (rev 04)
00:1f.2 SATA controller [0106]: Intel Corporation 7 Series/C210 Series 
Chipset Family 6-port SATA Controller [AHCI mode] [8086:1e02] (rev 04)
00:1f.3 SMBus [0c05]: Intel Corporation 7 Series/C210 Series Chipset Family 
SMBus Controller [8086:1e22] (rev 04)
01:00.0 PCI bridge [0604]: PLX Technology, Inc. PEX8112 x1 Lane PCI 
Express-to-PCI Bridge [10b5:8112] (rev aa)
02:04.0 Multimedia audio controller [0401]: C-Media Electronics Inc CMI8788 
[Oxygen HD Audio] [13f6:8788]


I can do more to help if asked.

Regards
Mark

View attachment "dmesg.nvidia-hdmi" of type "text/plain" (57191 bytes)

View attachment "dmesg.nouveau-hdmi" of type "text/plain" (56328 bytes)

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