Comment 11 for bug 547147

Dual Envision monitors on a Radeon 8500 yields:

[ 16.072653] i2c i2c-0: sendbytes: NAK bailout.
[ 16.072718] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID
[ 16.075223] i2c i2c-0: sendbytes: NAK bailout.
[ 16.287729] i2c i2c-0: sendbytes: NAK bailout.
[ 16.287793] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID
[ 16.288597] i2c i2c-0: sendbytes: NAK bailout.

...with useless resolutions, depths, and frame rates for my work, thus I have to leave 10.04 LTS and go BACK to 9.x where I spent enough time to get it working fine.

Info:

P: /devices/pci0000:00/0000:00:01.0/0000:01:00.0
E: UDEV_LOG=3
E: DEVPATH=/devices/pci0000:00/0000:00:01.0/0000:01:00.0
E: DRIVER=radeon
E: PCI_CLASS=30000
E: PCI_ID=1002:4150
E: PCI_SUBSYS_ID=1002:4722
E: PCI_SLOT_NAME=0000:01:00.0
E: MODALIAS=pci:v00001002d00004150sv00001002sd00004722bc03sc00i00
E: SUBSYSTEM=pci

[ 12.941549] [drm] radeon defaulting to kernel modesetting.
[ 12.941556] [drm] radeon kernel modesetting enabled.
[ 12.941634] radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[ 12.946488] [drm] radeon: Initializing kernel modesetting.
[ 12.953154] [drm] register mmio base: 0xF9000000
[ 12.953159] [drm] register mmio size: 65536
[ 12.955276] [drm] GPU reset succeed (RBBM_STATUS=0x00000140)
[ 12.955302] [drm] Generation 2 PCI interface, using max accessible memory
[ 12.955316] agpgart-intel 0000:00:00.0: AGP 3.0 bridge
[ 12.955343] agpgart-intel 0000:00:00.0: putting AGP V3 device into 8x mode
[ 12.955395] radeon 0000:01:00.0: putting AGP V3 device into 8x mode
[ 12.955422] [drm] radeon: VRAM 128M
[ 12.955426] [drm] radeon: VRAM from 0x00000000 to 0x07FFFFFF
[ 12.955430] [drm] radeon: GTT 128M
[ 12.955434] [drm] radeon: GTT from 0xE0000000 to 0xE7FFFFFF
[ 12.955464] [drm] radeon: irq initialized.
[ 12.955849] [drm] Detected VRAM RAM=128M, BAR=128M
[ 12.955856] [drm] RAM width 128bits DDR
[ 12.956174] [TTM] Zone kernel: Available graphics memory: 443594 kiB.
[ 12.956179] [TTM] Zone highmem: Available graphics memory: 513198 kiB.
[ 12.956206] [drm] radeon: 128M of VRAM memory ready
[ 12.956210] [drm] radeon: 128M of GTT memory ready.
[ 12.956463] [drm] radeon: 1 quad pipes, 1 Z pipes initialized.
[ 12.956483] [drm] radeon: cp idle (0x10000C03)
[ 12.956571] [drm] Loading R300 Microcode
[ 12.956578] platform radeon_cp.0: firmware: requesting radeon/R300_cp.bin
[ 13.538719] [drm] radeon: ring at 0x00000000E0000000
[ 13.538745] [drm] ring test succeeded in 0 usecs
[ 13.547031] [drm] radeon: ib pool ready.
[ 13.547155] [drm] ib test succeeded in 0 usecs
[ 13.549206] [drm] Default TV standard: NTSC
[ 13.549211] [drm] 27.000000000 MHz TV ref clk
[ 13.550456] [drm] Default TV standard: NTSC
[ 13.550461] [drm] 27.000000000 MHz TV ref clk
[ 13.550696] [drm] Radeon Display Connectors
[ 13.550701] [drm] Connector 0:
[ 13.550704] [drm] VGA
[ 13.550709] [drm] DDC: 0x60 0x60 0x60 0x60 0x60 0x60 0x60 0x60
[ 13.550713] [drm] Encoders:
[ 13.550716] [drm] CRT1: INTERNAL_DAC1
[ 13.550720] [drm] Connector 1:
[ 13.550723] [drm] VGA
[ 13.550727] [drm] DDC: 0x64 0x64 0x64 0x64 0x64 0x64 0x64 0x64
[ 13.550731] [drm] Encoders:
[ 13.550734] [drm] CRT2: INTERNAL_DAC2
[ 13.550738] [drm] Connector 2:
[ 13.550741] [drm] S-video
[ 13.550744] [drm] Encoders:
[ 13.550747] [drm] TV1: INTERNAL_DAC2
[ 13.608383] radeon 0000:01:00.0: The number of extension(32) is over max (4), actually read number (4)
[ 13.780280] alloc irq_desc for 17 on node -1
[ 13.780287] alloc kstat_irqs on node -1
[ 13.780301] Intel ICH 0000:00:1f.5: PCI INT B -> GSI 17 (level, low) -> IRQ 17
[ 13.780356] Intel ICH 0000:00:1f.5: setting latency timer to 64
[ 13.982559] i2c i2c-0: sendbytes: NAK bailout.
[ 13.982665] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID
[ 13.983523] i2c i2c-0: sendbytes: NAK bailout.
[ 14.104024] intel8x0_measure_ac97_clock: measured 54450 usecs (2624 samples)
[ 14.104028] intel8x0: clocking to 48000
[ 14.201992] [drm] 2: conflicting encoders switching off SVIDEO-1
[ 14.201999] [drm] in favor of VGA-2
[ 14.217891] [drm] fb mappable at 0xE8040000
[ 14.217896] [drm] vram apper at 0xE8000000
[ 14.217900] [drm] size 3145728
[ 14.217903] [drm] fb depth is 24
[ 14.217906] [drm] pitch is 4096
[ 14.218074] fb0: radeondrmfb frame buffer device
[ 14.218078] registered panic notifier
[ 14.218088] [drm] Initialized radeon 2.0.0 20080528 for 0000:01:00.0 on minor 0
[ 14.238626] vga16fb: initializing
[ 14.238635] vga16fb: mapped to 0xc00a0000
[ 14.238644] vga16fb: not registering due to another framebuffer present
[ 14.392254] Console: switching to colour frame buffer device 128x48
[ 14.430241] i2c i2c-0: sendbytes: NAK bailout.
[ 14.430470] [drm:radeon_vga_detect] *ERROR* VGA-1: probed a monitor but no|invalid EDID
[ 14.431538] i2c i2c-0: sendbytes: NAK bailout.