RADEON(0): [drm] Failed to open DRM device: No such file or directory error

[Alex Deucher]

On Sat, Mar 8, 2014 at 2:56 AM, StompDagger1 at yahoo.com
<stompdagger1 at yahoo.com> wrote:
> greetings,
>
> since I've updated my kernel to 3.13.x I'm unable to start X on my radeon
> cards.
>
> the setup works great in kernel 3.12.8, here is part of Xorg log for that
> adaper:
> [    51.782] (II) [KMS] Kernel modesetting enabled.
> [    51.782] (II) RADEON(0): RADEONPreInit_KMS
> [    51.782] (II) RADEON(0): Creating default Display subsection in Screen
> section
>         "Default Screen Section" for depth/fbbpp 24/32
> [    51.782] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
> [    51.782] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp
> pixmaps)
> [    51.782] (==) RADEON(0): Default visual is TrueColor
> [    51.782] (==) RADEON(0): RGB weight 888
> [    51.782] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
> [    51.782] (--) RADEON(0): Chipset: "ATI Radeon HD 3600 XT" (ChipID =
> 0x9598)
> [    51.829] (EE) RADEON(0): [drm] Failed to open DRM device for
> pci:0000:06:00.0: No such file or directory
> [    51.829] (EE) RADEON(0): Kernel modesetting setup failed
> [    51.829] (II) RADEON(0): RADEONFreeScreen
> [    51.829] (II) UnloadModule: "radeon"
> [    51.829] (EE) Screen(s) found, but none have a usable configuration.
> [    51.829] (EE)
> Fatal server error:
> [    51.829] (EE) no screens found(EE)
> [    51.829] (EE)
> Please consult the The X.Org Foundation support
>          at http://wiki.x.org
>
> is that a X bug? what is the right place to debug it, X or xf86-video-ati?

There's some problems with your kernel.  Check your dmesg output and
make sure the radeon kernel driver loaded properly.  Depending on your
setup you may be missing the necessary firmware files from your
initrd.

Alex