DRM KMS Modesetting

[David Herrmann]

On Fri, Nov 18, 2011 at 10:41 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Fri, 18 Nov 2011 22:35:13 +0100
> David Herrmann <dh.herrmann at googlemail.com> wrote:
>
>> 2011/11/15 Kristian Høgsberg <krh at bitplanet.net>:
>> > 2011/11/15 David Herrmann <dh.herrmann at googlemail.com>:
>> >> 2011/11/15 Kristian Høgsberg <krh at bitplanet.net>:
>> >>> On Mon, Nov 14, 2011 at 5:54 PM, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
>> >>>> On Mon, 14 Nov 2011 21:47:09 +0100
>> >>>> David Herrmann <dh.herrmann at googlemail.com> wrote:
>> >>>>> > I had to modify the resolution the test was searching for
>> >>>>> > to 1920x1200 instead of 1024x600 since I tested on a DP attached
>> >>>>> > monitor, and fix the connector id, but other than that it seemed to
>> >>>>> > work fine.
>> >>>>>
>> >>>>> Thanks for testing. At least my code seems right now, but I still
>> >>>>> cannot get it to work on my machine. The output of modetest is:
>> >>>>> https://gist.github.com/1365083
>> >>>>>
>> >>>>> There is only one connected connector+encoder+mode so I don't know
>> >>>>> where the problem exactly is. Are there any debug options? Is it
>> >>>>> possible to query the EGLImage for width/height?
>> >>>>
>> >>>> Ok maybe the gen3 vs gen4 EGL image code isn't calculating the
>> >>>> width/stride correctly somewhere then.  You'd have to walk through the
>> >>>> gbm_dri2.c and egl_dri2.c code and see where the width is going off
>> >>>> into the weeds.
>> >>>
>> >>> Could be, I know I've run Wayland on Pineview though, so that works at
>> >>> least.  David, did you try eglkms from mesa demos?
>> >>>
>> >>> http://cgit.freedesktop.org/mesa/demos/tree/src/egl/opengl/eglkms.c
>> >>
>> >> I tried it now. I get a black screen and in the left quarter there is
>> >> one white triangle which fades to black. But again, the right 3/4 of
>> >> the screen are black.
>> >>
>> >>> Kristian
>> >>>
>> >>
>> >> I will try to debug my mesa package but this will probably take some
>> >> time. If someone has an idea how to find the bug faster, just tell me
>> >> ;)
>> >
>> > It's all very odd.  The gbm allocation ends up in intel_create_image
>> > in src/mesa/drivers/dri/intel/intel_screen.c, so you can try to
>> > compare the stride, width and height there with what modetest uses.
>>
>> I just recompiled with newest git revision and I cannot reproduce the
>> bug anymore. I cannot tell what fixed it as I recompiled with other
>> configure options. Previously I used --disable-glx-tls and
>> --enable-gallium-drivers=i915. Now I use --enable-glx-tls and no i915
>> in gallium but only --with-dri-drivers=i915.
>> My laptop takes about 30min to compile mesa so I haven't tracked it down, yet.
>
> Ah it's probably gallium vs classic then.  We don't support the gallium
> driver at all, so I'm not sure what state it's in.

I recompiled it with the gallium driver. The problem definitely is the
gallium driver. However, if it is unsupported, I will not investigate
further.

Thanks for your responses.

> --
> Jesse Barnes, Intel Open Source Technology Center
>

Regards
David