No DVI output on ATI Xpress 200 - reopen

Alex Deucher alexdeucher at
Thu Jul 19 06:24:20 PDT 2012

On Thu, Jul 19, 2012 at 7:25 AM, Przemysław Tomczyk
<tomczyk.przemek at> wrote:
> Hi and hello to the list,
> Recently I've received workstation with Xpress 200 card, no DVI
> output. Kernel is 3.4.4.
> DVI output goes blank as soon as KMS kicks in.
> Xorg.log mentions no EDID for DVI-0, but forcing edid from file using
> drm_kms_helper module didn't help.
> Now i'm getting "DVI: Failed to assign ddc bus! Check dmesg for i2c
> errors.", bot no i2c errors in dmesg output.
> in /sys i c an see nodes for 2 buses:
> #cat /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:05.0/i2c-2/name
> Radeon i2c bit bus VGA_DDC
> # cat /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:05.0/i2c-1/name
> Radeon i2c bit bus DVI_DDC
> I have bios dump ready to attach on request.

Please open a bug:
Product: DRI, component: DRM/Radeon
and attach your xorg log, dmesg output, and a copy of your vbios.  To
get a copy of your vbios:
(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom



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