Getting HDMI Out Working on ExoPC Vibe

Before fixing sync problem

Equipment

ExoPC Vibe Atom Slate with N450 CPU and i915 graphics chip. (Thanks to Intel for the donation.) The ExoPC is based on the same Pegatron motherboard as the WeTab slate.
Epson H361A projector
HDMI to mini-HDMI cable

Resources

MeeGo Chrontel RPM from Brendan Arfoll. With a multiboot system, I simply copied the files Ubuntu needed from the MeeGo partition.

instructions available from 4Tiitoo.

Instructions

Tested on: MeeGo-IVI 1.2.0.5 and stock Ubuntu 11.10 both running ubuntu 3.0.0-12-generic kernel:
[alison@meego-ivi hdmi_out]$ uname -a
Linux meego-ivi.exerciseforthereader.org 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 i386 GNU/Linux
MeeGo: sudo rpm -ivh chrontel-1.0-2.1.i586.rpm
Ubuntu: copy files from RPM-based machine after extracting
Plug Epson H361A projector into ExoPC using HDMI to mini-HDMI cable. Samsung SyncMaster 740B DVI monitor with HDMI-DVI adapter does not work:
```
	EDID data not valid: Ignore HPD since EDID not valid just after firmware load
	Could not find a useful resolution. Maybe hardware problem.
```
This problem is likely fixable by using read-edid to discover correct display settings. MeeGo didn't have the needed libx86.so.1, so I copied it from the Ubuntu partition.

sudo modprobe -i i2c-i801
which creates /dev/hdmi:

   lrwxrwxrwx 1 root root 6 2011-12-23 02:34 /dev/hdmi -> i2c-14

sudo modprobe -i i2c-dev

Check drivers:

lsmod | grep i2c

   i2c_i801               17346  0 
   i2c_dev                13199  0 
   i2c_algo_bit           13199  1 i915

sudo /usr/bin/tiitoo-hdmi.sh
Projector should now show the expected image.

Notes

What's in the chrontel rpm?

   rpm -qil chrontel

    Name        : chrontel                     Relocations: (not relocatable)
    Version     : 1.0                               Vendor: meego
    Release     : 2.1                           Build Date: Mon 15 Aug 2011 04:52:56 PM EEST
    Install Date: Thu 22 Dec 2011 10:39:05 PM EET      Build Host: build18
    Group       : System/Daemon                 Source RPM: chrontel-1.0-2.1.src.rpm
    Size        : 84225                            License: Public Domain
    Signature   : DSA/SHA1, Mon 15 Aug 2011 04:53:04 PM EEST, Key ID 0bc7bec479fc1f8a
    Summary     : Control Tool for Chrontel CH7036 HDMI chip
    Description :
    Control Tool from Google Chromium Project for Chrontel CH7036 HDMI chip
    /etc/dbus-1/system.d/com.tiitoo.HDMI.conf
    /etc/modprobe.d/chrontel_i2c.conf
    /etc/udev/rules.d/10-kernel-chrontel.rules
    /etc/xdg/autostart/tiitoo-hdmi.desktop
    /lib/firmware/chrontel/fw7036.bin
    /usr/bin/tiitoo-hdmi-daemon
    /usr/bin/tiitoo-hdmi.sh

What's the 7306 chip? From spectrah.com:

Chrontel 7306 is an SDVO ADD2 card that plugs in PCIe and receives SDVO signals from mainboards integrated in Intel SDVO chipsets like 945G/965G and also transfer SDVO signal to digital signals for LCD panels.

and Wikipedia:

Wikipedia: Serial Digital Video Out is a proprietary Intel technology introduced with their 9xx-series of motherboard chipsets. SDVO makes it possible to use a 16-line PCIe slot add additional video signalling interfaces such as VGA and DVI monitor outputs, SDTV and HDTV television outputs, or TV tuner inputs to a system board containing an integrated Intel 9xx-series graphics processor. SDVO adapters are variously designated as ADD2 (advanced digital display, 2nd generation)

The i801 chip provides the System Management Bus, which sits on PCI:

grep i801 /var/log/messages:
Dec 23 02:34:18 meego-ivi klogd: [ 2467.442742] i801_smbus 0000:00:1f.3: PCI INT C -> GSI 18 (level, low) -> IRQ 18

lshw output about SMBus:

        *-serial
             description: SMBus
             product: 82801H (ICH8 Family) SMBus Controller
             vendor: Intel Corporation
             physical id: 1f.3
             bus info: pci@0000:00:1f.3
             version: 04
             width: 32 bits
             clock: 33MHz
             configuration: driver=i801_smbus latency=0
             resources: irq:18 memory:fe404000-fe4040ff ioport:f000(size=32)

xrandr output isn't changed by kernel driver loading:

    Screen 0: minimum 320 x 200, current 1366 x 768, maximum 4096 x 4096
    LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 256mm x 144mm
    1366x768       60.0*+
    1024x768       60.0  
    800x600        60.3     56.2  
    640x480        59.9  
    VGA1 disconnected (normal left inverted right x axis y axis)

tiitoo-hdmi-daemon produces verbose output:

Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'IEC958 Default PCM',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
[alison@meego-ivi ~]$ Found device ID 0x56
Found revision ID 0x81
Mode 1366x768 (43)
1366x768, dot clock 76850000  -Hsync -Vsync
H: start 1414, end 1446, skew 0, total 1560
V: start 771, end 783, total 821
State: 0
Firmware size = 3295 bytes.
State: 2
State: 3
---------------- BASE EDID RAW DATA ---------------------
 0x0000:  00 ff ff ff ff ff ff 00 4c a3 03 a6 01 01 01 01 
 0x0010:  26 14 01 03 80 a0 5a 78 0a de 50 a3 54 4c 99 26 
 0x0020:  0f 50 54 21 08 00 a9 40 90 40 81 80 81 40 81 c0 
 0x0030:  01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c 
 0x0040:  45 00 40 84 63 00 00 1e 9e 20 00 90 51 20 1f 30 
 0x0050:  48 80 36 00 40 84 63 00 00 1c 00 00 00 fd 00 17 
 0x0060:  55 0f 5c 11 00 0a 20 20 20 20 20 20 00 00 00 fc 
 0x0070:  00 45 50 53 4f 4e 20 50 4a 0a 20 20 20 20 01 a6 
---------------- Extended EDID RAW DATA ---------------------
 0x0080:  02 03 28 f6 51 90 1f 20 22 05 14 04 13 03 02 12 
 0x0090:  11 07 06 16 15 01 23 09 07 07 83 01 00 00 66 03 
 0x00a0:  0c 00 10 00 80 e2 00 fd 01 1d 80 18 71 1c 16 20 
 0x00b0:  58 2c 25 00 40 84 63 00 00 9e 01 1d 80 d0 72 1c 
 0x00c0:  16 20 10 2c 25 80 40 84 63 00 00 9e 01 1d 00 72 
 0x00d0:  51 d0 1e 20 6e 28 55 00 40 84 63 00 00 1e 8c 0a 
 0x00e0:  d0 8a 20 e0 2d 10 10 3e 96 00 40 84 63 00 00 18 
 0x00f0:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 
-------------------- EDID information --------------------------
Manufacturer ID SEC, product ID 0xa603
Manufactured wk 38 of 2010. Edid version 1.3
Input: digital, vid level 0, Blank to black, Separate Composite On-green Serration V sync, 160x90cm, Gamma 2.200000
Features:    colour non-std-cspace preferred-timing default-GTF
Established Timing:
640x480@60
800x600@60
1024x768@60
Standard timing:
0: 1600x1200@60
1: 1400x1050@60
2: 1280x1024@60
3: 1280x960@60
4: 1280x720@60
Descriptor blocks:
1920x1080p@60.00, dot clock 148500000  +Hsync +Vsync
H: start 2008, end 2052, total 2200
V: start 1084, end 1089, total 1125
Size 1600x900mm, Border 0x0 pixels
1280x800p@59.81, dot clock 83500000  -Hsync +Vsync
H: start 1352, end 1480, total 1680
V: start 803, end 809, total 831
Size 1600x900mm, Border 0x0 pixels
Range V 23 - 85 Hz, H 15 - 92 kHz, Pel <= 170 MHz
Name: EPSON PJ
EDID contains 1 extensions
Found CEA EDID Timing Extension rev 3
Block has 6 DTDs starting at offset 40 (thus 36 bytes of DBCs)
Support: underscan, basic audio, YCrCb 4:4:4, YCrCb 4:2:2
Video: Code 16 (native)
Video: Code 31 
Video: Code 32 
Video: Code 34 
Video: Code 5 
Video: Code 20 
Video: Code 4 
Video: Code 19 
Video: Code 3 
Video: Code 2 
Video: Code 18 
Video: Code 17 
Video: Code 7 
Video: Code 6 
Video: Code 22 
Video: Code 21 
Video: Code 1 
Audio: 1 channel LPCM: 48k 44k 32k 24-bit 20-bit 16-bit
Speakers: Front L/R 
HDMI Vendor block (CEC @0x0010):
Support: AI 
Max TMDS Frequency 1130MHz
Unknown Data Block with type tag 0x7, length 0x2
1920x540i@60.05, dot clock 74250000  +Hsync +Vsync
H: start 2008, end 2052, total 2200
V: start 542, end 547, total 562
Size 1600x900mm, Border 0x0 pixels
1920x540i@50.04, dot clock 74250000  +Hsync +Vsync
H: start 2448, end 2492, total 2640
V: start 542, end 547, total 562
Size 1600x900mm, Border 0x0 pixels
1280x720p@60.00, dot clock 74250000  +Hsync +Vsync
H: start 1390, end 1430, total 1650
V: start 725, end 730, total 750
Size 1600x900mm, Border 0x0 pixels
720x480p@59.94, dot clock 27000000  -Hsync -Vsync
H: start 736, end 798, total 858
V: start 489, end 495, total 525
Size 1600x900mm, Border 0x0 pixels
Undecoded descriptor block type 0x0
Undecoded descriptor block type 0x0
----------------------------------------------------------------
------------------------------------------------------------------
Resolution choosen because: preferred/native resolution requested in EDID
GenTableCH7036 Timing of external Display timing set to:
    148500,
    0x10000,
    1, 1, 1,
    2200, 1920, 88, 44, 1125, 1080, 4, 5,
    0x0000,
GenTableCH7036 Timing of internal Display timing set to:
    76850,
    0x00000,
    0, 0, 1,
    1560, 1366, 48, 32, 821, 768, 3, 12,
    0x0000,
Restore defaults:
... Restored 0 registers
Program registers:
Change SDTIME1 from 0x20 to 0x20
CH7036Control:speakerOff(): Error: Couldn't set volume:  "The name com.tiitoo.SystemInfo was not provided by any .service files" 
CH7036Control:speakerOff(): oldVolume: 0 
Sound is On