After the latest dri update X11 reports a KMS error with a Radeon card which previously worked just fine.

[Tijl Coosemans]

On Sat, 18 Oct 2014 15:25:21 +0300 Jukka Ukkonen <jau789 at gmail.com> wrote:
> Current version of pixman: 0.32.4
>          Before reporting problems, check http://wiki.x.org
>          to make sure that you have the latest version.
> Markers: (--) probed, (**) from config file, (==) default setting,
>          (++) from command line, (!!) notice, (II) informational,
>          (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
> (==) Log file: "/var/log/Xorg.0.log", Time: Sat Oct 18 14:25:50 2014
> (==) Using config file: "/usr/local/lib/X11/xorg.conf"
> (==) Using system config directory "/usr/local/share/X11/xorg.conf.d"
> *(II) [KMS] drm report modesetting isn't supported.*
> 
> Fatal server error:
> no screens found
> 
> Please consult the The X.Org Foundation support
>           at http://wiki.x.org
>   for help.
> Please also check the log file at "/var/log/Xorg.0.log" for additional 
> information.

Please try the attached patch for graphics/libdrm.  The library checks
hw.dri.0.modesetting sysctl to see if KMS is available before loading
the DRM kernel modules that provide that sysctl.
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