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

[Thomas Zimmermann]

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

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)
Geschäftsführer: Ivo Totev
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