Re: X color issues on PowerMac G5

On Tue, Aug 16, 2022 at 5:16 PM Jasper Vinkenvleugel <
j.t.vinkenvleugel@proton.me> wrote:

> Hello,
>
> Thank you for your quick reaction and sorry for my late response!
>
> I'm using the OFWFB kernel driver, yes. I just compiled and installed the
> 14.0-CURRENT kernel (on which I run the 13.1 userland) and afterwards I
> updated my version of xf86-video-scfb to 0.0.7. Unfortunately this did not
> seem to fix my issue, as I'm still getting the same output I got
> previously. Is it a problem that I'm still using the 13.1 userland?
>
> Kind regards,
>
> Jasper Vinkenvleugel
>

Hello,

I think installkernel doesn't install system header files.
Can you attach your /var/log/Xorg.0.log and /usr/include/sys/fbio.h files?

If your fbio.h file doesn't have FBIO_GETRGBOFFS in it, then
xf86-video-scfb won't try to call this ioctl.
In this case, you would need to backup the original fbio.h file, replace it
with the one from -CURRENT and rebuild scfb.
After that, you may restore the original file, if needed.

This is a workaround, but unfortunately this part couldn't be merged to
13.1, because it changes struct fb_info.

Regards,
Leandro

------- Original Message -------
> On Friday, July 29th, 2022 at 14:40, luporl <luporl@freebsd.org> wrote:
>
> I just remembered that one of the fixes of OFWFB driver wasn't backported
> to 13.1-RELEASE, because it introduced a new ioctl and also changed a
> struct.
> So, besides the previous steps, you may also want to try to use a -CURRENT
> kernel, or apply https://reviews.freebsd.org/D29000 and rebuild
> 13.1-RELEASE kernel.
>
> On Fri, Jul 29, 2022 at 9:28 AM luporl <luporl@freebsd.org> wrote:
>
>> Hello Jasper,
>>
>> I'm assuming colors are already ok on console, so that's a good start.
>> The color-related issues you're seeing with X are probably being caused
>> by using a graphics card with a Little-Endian framebuffer on a CPU that is
>> Big-Endian.
>>
>> But indeed, even in this case, colors should work fine on PowerPC64
>> machines, such as Blackbird, Talos II and probably G5, running in
>> Big-Endian mode.
>> AFAIK, this was tested only with OFWFB kernel driver. Is this the one
>> you're using? You can check that with:
>> dmesg | grep "VT(ofwfb)".
>>
>> Next, make sure you are using xf86-video-scfb version 0.0.7, that has the
>> fix for the color issues.
>>
>> Finally, if you have issues with Xorg Server (it used to crash in some
>> cases on PPC64 with the color fixes in OFWFB and SCFB), if you're using
>> version 1.20.x or older, you may need to patch it and rebuild it from ports.
>> You'll need to get patch-hw_xfree86_common_xf86Helper.c and
>> patch-render_picture.c from
>> https://people.freebsd.org/~luporl/gfx_patches/xorg-server/, copy them
>> the to 'files' directory of xorg-server in ports tree, rebuild and
>> reinstall it.
>> If you have this last issue, please let us know and we can request these
>> 2 patch files to be included in FreeBSD's xorg-server port's patches, to
>> make this easier for other users, while FreeBSD is still using 1.20.x.
>>
>> Cheers,
>> Leandro
>>
>> On Fri, Jul 29, 2022 at 4:18 AM Jasper Vinkenvleugel <
>> j.t.vinkenvleugel@proton.me> wrote:
>>
>>> Hello,
>>>
>>> Please excuse me if I'm using this mailing list incorrectly.
>>>
>>> Recently I bought a PowerMac G5 with the intent of getting FreeBSD
>>> 13.1-RELEASE powerpc64 running on it. So far so good, but when I want to
>>> use X on the Nvidia FX 5200 Ultra the colors are completely off. For
>>> example in TWM all white surfaces are red. On the wiki I read about
>>> color-related issues with Blackbird and Talos II with the onboard graphics
>>> card and I wonder if similar problems might be going on here? The only
>>> other pointer I can find is 'scfb: LoadPalette 0' being spammed in the
>>> console.
>>>
>>> Kind regards,
>>>
>>> Jasper Vinkenvleugel
>>>
>>>
>>>
>