Nouveau - Jul 2016 - Nouveau fails to initialize G94GL / Quadro-FX1800 on aarch64 board

Hi Ilia,
> Very odd. Perhaps you're trying to run X as non-root and don't have
> proper permissions on /dev/dri/card0? It seems like something in
>
https://cgit.freedesktop.org/nouveau/xf86-video-nouveau/tree/src/nv_driver.c#n400
Thanks for the pointer, I'll try to dig a bit deeper there.

I forgot to mention that I am trying to run X inside an debian
unstable chroot (the main system is an embedded distribution where
installing X + mesa would be a major hassle).
FBdev works fine within this setup.

Thanks and best regards, Clemens

Hi,
>> Very odd. Perhaps you're trying to run X as non-root and don't
have
>> proper permissions on /dev/dri/card0? It seems like something in
>>
https://cgit.freedesktop.org/nouveau/xf86-video-nouveau/tree/src/nv_driver.c#n400
The call to HasKMS came from NVPlatformProbe - NVPlatformProbe
succeeds and returns true.
However, it seems Xorg aborts before NVPciProbe is ever called.

I'll have a look at Xorg's source to get a better understanding what
is happening arround nouveau.

Br, Clemens

Hi again,

Some further digging revealed that NVPlatformProbe is called with the
flag PLATFORM_PROBE_GPU_SCREEN, so the flag XF86_ALLOCATE_GPU_SCREEN
is passed to xf86AllocateScreen.

After xf86AllocateScreen I end up with xf86GPUScreens == 1 and
xf86NumScreens == 0.

The xf86GPUScreens seems to be ignored by all the following code, only
xf86NumScreens is evaluated afterwards in xf86BusConfig:
    /* If nothing was detected, return now */
    if (xf86NumScreens == 0) {
        xf86Msg(X_ERROR, "No devices detected.\n");
        return FALSE;
    }

Is the issue that xf86NumScreens is zero at the beginning, or that
xf86GPUScreens is not taken into account later on?

Any help would be highly appreciated.

Thanks and best regards, Clemens