No DVI output on ATI Xpress 200 - reopen
tomczyk.przemek at gmail.com
Mon Jul 23 03:06:06 PDT 2012
could it be possible that I'd try to communicate with LCD display thru
ddc using i2c-dev module to probe how to access it? maybe this would
2012/7/19 Alex Deucher <alexdeucher at gmail.com>:
> On Thu, Jul 19, 2012 at 7:25 AM, Przemysław Tomczyk
> <tomczyk.przemek at gmail.com> 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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