Radeon HD 2600 XT, DVI outputs

[Christian König]

Hi Andriy,

well first of all can you please test that with Linux? If this works on 
Linux then there is probably just something missing on the FreeBSD port.

Regards,
Christian.

Am 16.08.22 um 10:48 schrieb Andriy Gapon:
>
> Out of necessity I had to use an ancient Radeon HD 2600 XT card.
> It has two DVI outputs (and one S-video).
>
> I noticed a curious problem, if I attach a monitor to either of the 
> DVI outputs, then initially there is video output but as soon as 
> radeonkms driver attaches the monitor goes blank.
> But if I attach the same monitor to either of the outputs using its VGA
> input and DVI->VGA converter, then the video works fine all the time.
>
> I tested the monitor's DVI input with a different machine and there it 
> works just fine (and, as I said, it also works fine before radeonkms 
> is loaded).
>
> Here is a piece of output from the driver with the direct DVI attachment:
> [drm] Radeon Display Connectors
> [drm] Connector 0:
> [drm]   DVI-I-1
> [drm]   HPD1
> [drm]   DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
> [drm]   Encoders:
> [drm]     DFP1: INTERNAL_KLDSCP_TMDS1
> [drm]     CRT2: INTERNAL_KLDSCP_DAC2
> [drm] Connector 1:
> [drm]   DIN-1
> [drm]   Encoders:
> [drm]     TV1: INTERNAL_KLDSCP_DAC2
> [drm] Connector 2:
> [drm]   DVI-I-2
> [drm]   HPD2
> [drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
> [drm]   Encoders:
> [drm]     CRT1: INTERNAL_KLDSCP_DAC1
> [drm]     DFP2: INTERNAL_LVTM1
> drmn0: [drm] Cannot find any crtc or sizes
>
> The same scenario with additional diagnostics: 
> https://people.freebsd.org/~avg/radeon-2600-dvi-dvi.txt
>
>
> And here is with the DVI->VGA configuration:
> [drm] Radeon Display Connectors
> [drm] Connector 0:
> [drm]   DVI-I-1
> [drm]   HPD1
> [drm]   DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
> [drm]   Encoders:
> [drm]     DFP1: INTERNAL_KLDSCP_TMDS1
> [drm]     CRT2: INTERNAL_KLDSCP_DAC2
> [drm] Connector 1:
> [drm]   DIN-1
> [drm]   Encoders:
> [drm]     TV1: INTERNAL_KLDSCP_DAC2
> [drm] Connector 2:
> [drm]   DVI-I-2
> [drm]   HPD2
> [drm]   DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
> [drm]   Encoders:
> [drm]     CRT1: INTERNAL_KLDSCP_DAC1
> [drm]     DFP2: INTERNAL_LVTM1
> [drm] fb mappable at 0xE0243000
> [drm] vram apper at 0xE0000000
> [drm] size 3145728
> [drm] fb depth is 24
> [drm]    pitch is 4096
>
> The same scenario with additional diagnostics: 
> https://people.freebsd.org/~avg/radeon-2600-dvi-vga.txt
>
>
> Not sure if this is something with the hardware...
>
> Thanks!