Created attachment 37549 [details]
dmesg

Created attachment 37550 [details]
Xorg.0.log

Created attachment 37551 [details]
`xrandr --verbose`

Perhaps the hpd pins are reversed on your system.  Does the following hack fix it?

--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -173,10 +173,10 @@ static struct radeon_hpd radeon_atom_get_hpd_info_from_gpio(struct radeon_device
        if (gpio->reg == reg) {
                switch(gpio->mask) {
                case (1 << 0):
-                       hpd.hpd = RADEON_HPD_1;
+                       hpd.hpd = RADEON_HPD_2;
                        break;
                case (1 << 8):
-                       hpd.hpd = RADEON_HPD_2;
+                       hpd.hpd = RADEON_HPD_1;
                        break;
                case (1 << 16):
                        hpd.hpd = RADEON_HPD_3;

I'm not sure if there is something reversed (because it worked long time before), but your patch works.

I cannot verify if the HDMI port works as expected, I don't have any HDMI device...

Created attachment 37554 [details]
dmesg after your patch

Created attachment 37555 [details]
Xorg.0.log after your patch

Created attachment 37556 [details]
`xrandr --verbose` after your patch

(In reply to comment #5)
> I'm not sure if there is something reversed (because it worked long time
> before), but your patch works.

The original fix worked by accident since it always chose the DVI port if the edid did not contain the hdmi flag.  Unfortunately, it didn't work properly with HDMI to DVI converters and monitors without the hdmi flag in the edid.

It doesn't really matter as both the hdmi and dvi ports use the same encoder and ddc channel so the signal will be the same on either one and you cannot use them both at the same time with independent timing.

What are the pci ids for your card (lspci -vnn) so I can add a quirk?

Here is the ATI section of my `lspci -vnn`:

01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Mobility Radeon HD 3400 Series [1002:95c4] (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device [1025:013c]
        Flags: bus master, fast devsel, latency 0, IRQ 44
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at cfef0000 (64-bit, non-prefetchable) [size=64K]
        I/O ports at 2000 [size=256]
        [virtual] Expansion ROM at cfe00000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: radeon

01:00.1 Audio device [0403]: ATI Technologies Inc RV620 Audio device [Radeon HD 34xx Series] [1002:aa28]
        Subsystem: ATI Technologies Inc RV620 Audio device [Radeon HD 34xx Series] [1002:aa28]
        Flags: bus master, fast devsel, latency 0, IRQ 47
        Memory at cfeec000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information <?>
        Kernel driver in use: HDA Intel

Created attachment 37562 [details] [review]
add quirk

This patch should fix it.

(In reply to comment #13)
> Created an attachment (id=37562) [details]
> add quirk
> 
> This patch should fix it.

Doesn't work. There is one section for my laptop already, but removing it and keeping your latest changes fixes the problem. So your patch works when the old section gets removed.

Created attachment 37602 [details] [review]
add quirk

Updated patch.

(In reply to comment #15)
> Created an attachment (id=37602) [details]
> add quirk
> 
> Updated patch.

The updated patch works. Thanks!

Created attachment 37615 [details]
dmesg after your "add quirk" patch

Created attachment 37616 [details]
Xorg.0.log after your "add quirk" patch

Created attachment 37617 [details]
`xrandr --verbose` after your "add quirk" patch

I've sent the patch upstream.

The patch has been included in kernel 2.6.36-rc1