mgag200 broken on kernel-6.0-rc3 on DELL/T620

[Wang Yugui]

Hi,

> Hi
> 
> Am 15.09.22 um 16:41 schrieb Wang Yugui:
> > Hi,
> >
> >> Hi
> >>
> >> Am 14.09.22 um 16:58 schrieb Wang Yugui:
> >> [...]
> >>>> 24-bit works on my G200HE and G200 test machines. Maybe the G200ER has a bug.
> >>>>
> >>>> When I try 16-bit depth, the display works, but is way too dark. No fiddling with the LUT tables fixes this. It's 90s hardware, so it should support 16-bit framebuffers well, but there's no obvious bug to be seen.
> >>>>
> >>>> I guess, we could remove 16 and 24 bit support for now if nothing else helps.
> >>>
> >>>
> >>> maybe better if we revert 73f54d5d9682 (drm/mgag200: Remove special case
> >>> for G200SE with <2 MiB)
> >>
> >> Could you please test the attached patch on the 6.0-rc3 kernel? It should force the driver to a correct color format if no kernel parameters are given.
> >>
> >
> > This patch works well.
> 
> I have meanwhile added the patch to drm-misc-fixes. We want to add a workaround for your machine to the driver. Can you please send me the output of
> 
>    sudo dmidecode -s system-manufacturer
> 
> and
> 
>    sudo dmidecode -s system-product-name
> 


DELL/T630
[root at T630 ~]# dmidecode -s system-manufacturer
Dell Inc.
[root at T630 ~]# dmidecode -s system-product-name
PowerEdge T630


DELL/T620
[root at T620 ~]# dmidecode -s system-manufacturer
Dell Inc.
[root at T620 ~]# dmidecode -s system-product-name
PowerEdge T620

Best Regards
Wang Yugui (wangyugui at e16-tech.com)
2022/09/20

> Best regards
> Thomas
> 
> >
> > test case detail:
> >    kernel parm video is not given
> >    server DELL/T620
> >    kernel is 6.0-rc5
> >
> > Best Regards
> > Wang Yugui (wangyugui at e16-tech.com)
> > 2022/09/15
> >
> >
> >> Best regards
> >> Thomas
> >>
> >>>
> >>> because there is no test result on device G200_SE
> >>>
> >>> static unsigned int mgag200_preferred_depth(struct mga_device *mdev)
> >>> {
> >>>          if (IS_G200_SE(mdev) && mdev->vram_fb_available < (2048*1024))
> >>>                  return 16;
> >>>          else
> >>>                  return 32;
> >>> }
> >>>
> >>> Best Regards
> >>> Wang Yugui (wangyugui at e16-tech.com)
> >>> 2022/09/14
> >>>
> >> -- Thomas Zimmermann
> >> Graphics Driver Developer
> >> SUSE Software Solutions Germany GmbH
> >> Maxfeldstr. 5, 90409 Nürnberg, Germany
> >> (HRB 36809, AG Nürnberg)
> >> Gesch?ftsführer: Ivo Totev
> >
> > 
> -- Thomas Zimmermann
> Graphics Driver Developer
> SUSE Software Solutions Germany GmbH
> Maxfeldstr. 5, 90409 Nürnberg, Germany
> (HRB 36809, AG Nürnberg)
> Gesch?ftsführer: Ivo Totev