[mythtv-users] Problems with libvisual (MythMusic) and xmame (MythGame)
arthur at phraction.org
Sun Sep 14 10:13:22 UTC 2008
Timothee Groleau wrote:
[ ... ]
> and here is my xorg.conf:
Thanks for this.
>>> 2) this issue is not specific to mythtv but I figured some of you may
>>> know: xmame refuses to start (both from mythfrontend and standalone at
>>> the command line), and I can't find what's wrong. I get the following
>>> message: ==========
>>> #xmame.x11 /path/to/rom
>>> MIT-SHM Extension Available. trying to use...
>>> Error: failed to create MITSHM block.
>>> video_init failed
>>> the shared memory is mounted as follow:
>>> shm on /dev/shm type tmpfs (rw,noexec,nosuid,nodev)
>>> xmame was emerged with the following use flags:
>>> games-emulation/xmame-0.106 USE="X alsa joystick opengl
>>> sdl -arts -dga -esd -expat -ggi -lirc (-mmx) -net (-svga) -xinerama -xv"
>> Guessing here - maybe there's a permission issue on /dev/shm?
> well, /dev/shm shows as:
> drwxrwxrwt 2 root root 40 Sep 13 06:53 shm
Not a permission problem then.
It looks as if your X server reports that it supports the MIT-SHM
extension, but that's not working properly. MIT-SHM sits on top of the
SysV shared memory system. I think /dev/shm is used for for Posix shared
memory, not SysV IPC shared memory, so it may not be relevant here.
It may be that the SysV shared memory on your Mythbox is being used by
something else, so that xmame can't grab what it needs. You can use ipcs
to see what's being used - this may help diagnose the problem. It's
useful that you have a machine where xmame works to compare against.
You should be able to increase the amount available with the sysctl
command, something like:
You can make it permanent by setting kernel.shmmax=<biggernum> in
Alternatively you could try disabling MIT-SHM in your xmame build. Not
being a Gentoo user, I don't know how to do this with emerge - I'd just
bang on the Makefile.
Hope this helps.
> and on my other gentoo box, xmame runs fine, but on that box, I have a
> dedicated graphic card.
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