Failed to open DRM device

[Alex Deucher]

On Tue, Oct 26, 2010 at 3:29 AM, Zhang Weiwu <zhangweiwu at realss.com> wrote:
>  On 10/26/2010 03:26 PM, Alex Deucher wrote:
>> The driver automatically loads on all supported devices.  In most
>> cases multiple cards work fine, however, for some reason, it's not
>> able to access the vbios on one of your cards.
>
> What should I do now? Must I remove one of the cards?
>
> (Previous suggestion of adding BusID was tried without luck.)
>

Please file a bug (https://bugs.freedesktop.org) and attach your xorg
log, xorg config and dmesg output.  You can also try disabling kms in
the meantime; boot with radeon.modeset=0 on the kernel command line in
grub.

Alex