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

[Fred]

On 03/15/14 04:34, StompDagger1 at yahoo.com wrote:
> here is a simple test case that reproduces the issue on my machine:
> dagg at NCC-5001-D ~/workspace $ cat open_example.c
> #include <unistd.h>
> #include <fcntl.h>
> #include <stdio.h>
> #include <errno.h>
> #include <string.h>
>
> int main()
> {
>         char *param1 = "ok";
>         char *param2 = ".";
>         int filedesc = open("/dev/dri/card1", O_RDWR, 0);
>         if (filedesc) {
>                 param1 = "ERROR: ";
>                 param2 = strerror(errno);
>         }
>         printf("fd = %d, status = %s%s\n", filedesc, param1, param2);
>         close(filedesc);
>
>         return 0;
> }dagg at NCC-5001-D ~/workspace $ gcc open_example.c -o open_example && 
> ./open_example
> fd = -1, status = ERROR: Invalid argument
>
>
> On Friday, March 14, 2014 4:22 PM, "StompDagger1 at yahoo.com" 
> <stompdagger1 at yahoo.com> wrote:
> On Tuesday, March 11, 2014 8:45 AM, "StompDagger1 at yahoo.com" 
> <stompdagger1 at yahoo.com> wrote:
> >On Tuesday, March 11, 2014 5:16 AM, Michel Dänzer 
> <michel at daenzer.net> wrote:
> >On Mon, 2014-03-10 at 08:23 -0700, StompDagger1 at yahoo.com 
> <mailto:StompDagger1 at yahoo.com> wrote:
> >
> >>
> >>
> >> >On Monday, March 10, 2014 5:58 AM, Michel Dänzer 
> <michel at daenzer.net <mailto:michel at daenzer.net>>
> >> wrote:
> >>
> >> >On Sam, 2014-03-08 at 11:41 -0800, StompDagger1 at yahoo.com 
> <mailto:StompDagger1 at yahoo.com> wrote:
> >> >
> >> >> >On Sat, Mar 8, 2014 at 2:56 AM, StompDagger1 at yahoo.com 
> <mailto:StompDagger1 at yahoo.com>
> >> >> >
> >> >> >> [    51.829] (EE) RADEON(0): [drm] Failed to open DRM device for
> >> >> >> pci:0000:06:00.0: No such file or directory
> >> >
> >> >'No such file or directory' sounds like something is deleting
> >> >your /dev/dri/card* files, or not creating them in the first place.
> >> >Maybe check your udev setup.
> >> >
> >> >If it only happens with a 3.13 kernel but not with a 3.12 one,
> >> another
> >> >option is to bisect the kernel.
> .>
> .> Greetings Michel,
> .>
> .> dri node do exists, see:
> >> dagg at NCC-5001-D <mailto:dagg at NCC-5001-D> ~ $ ll /dev/dri
> >> total 0
> >> crw-rw----+ 1 root video 226,  0 Mar 10 09:27 card0
> >> crw-rw----+ 1 root video 226,  1 Mar 10 09:27 card1
> >> crw-rw----+ 1 root video 226,  2 Mar 10 09:27 card2
> >> crw-rw----  1 root video 226, 64 Mar 10 09:27 controlD64
> >> crw-rw----  1 root video 226, 65 Mar 10 09:27 controlD65
> >> crw-rw----  1 root video 226, 66 Mar 10 09:27 controlD66
> >>
> >> I think that the way to find the cause on my part is to check the
> >> origin of that msg in Xorg.log.
> >>
> >> is that a xserver msg or xf86-video-ati msg?
> >
> >
> >The message is from the radeon driver, but it's because drmOpen() in
> >libdrm fails. It would indeed be interesting to track down where the 'No
> >such file or directory' error originates from.
>
> will do, when I'll have more info, I'll update.
>
> Greetings Michel,
>
> I've tried to track the source if that error, I've enabled dbg prints 
> in libdrm and found this:
> (II) [KMS] Kernel modesetting enabled.
> drmOpenDevice: node name is /dev/dri/card0
> drmOpenDevice: open result is 11, (OK)
> drmOpenByBusid: Searching for BusID pci:0000:06:00.0
> drmOpenDevice: node name is /dev/dri/card0
> drmOpenDevice: open result is 11, (OK)
> drmOpenByBusid: drmOpenMinor returns 11
> drmOpenByBusid: drmGetBusid reports pci:0000:00:02.0
> drmOpenDevice: node name is /dev/dri/card1
> drmOpenDevice: open result is -1, (Invalid argument)
> drmOpenByBusid: drmOpenMinor returns -22
> drmOpenDevice: node name is /dev/dri/card2
> drmOpenDevice: open result is -1, (Invalid argument)
>
> looking in the code I see this:
>     fd = open(buf, O_RDWR, 0);
>     drmMsg("drmOpenDevice: open result is %d, (%s)\n",
>                 fd, fd < 0 ? strerror(errno) : "OK");
>     if (fd >= 0)
>         return fd;
>
> I think that the issue might be that the file cannot be opened for 
> that mode as the path is printed above and it is ok.
>
> any ideas what might it be?
>
I had a similar problem over the last weeks using kernel 3.13.x  Not 
sure it happened before with older kernels.
I am using a "from scratch" distro.  It's using systemd and glibc-2.19, 
with relatively recent Xorg and Mesa development.
I have a Radeon 4870.  I don't think it's the video card.
Tentatively what happens is I lose the /dev/dri/card0 and the display 
goes black.  I get "no usable screens found" in the Xorg.0.log file.
Anyway what seems to be causing the problem is If I leave a music CD in 
the CD drive, upon booting, timing issues or something cause the 
dri/card0 device to go away.   There are a lot of messages in the kernel 
log, where it's  trying to find out about the music CD.
X seems to come up fine with no music CD in the drive.

Fred


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