Re: Intel graphics drm issue?

Bruno Prémont
2012-10-12T21:16:07Z

Hi Mark,

[CCing intel-gfx]

On Fri, 12 October 2012 Mark Hounschell <markh@compro.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@geexbox) (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.

> [ 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.

Bruno