[PATCH] drm/mgag200: Increase bandwidth for G200se A rev1

[Thomas Zimmermann]

Hi

Am 27.07.23 um 19:24 schrieb Roger Sewell:
> 
> Thomas,
> 
>> Could you provide us with the Xorg logs from /var/log/Xorg.0.log ,
>> please?
>>
>> Specifically, I'd be interested in different logs from combinations of
>> the old and new kernel and the old and new userspace.
> 
> I've managed to do six of the eight possible combinations of kernel,
> mgag200 module, and userspace. The attached archive contains all the
> corresponding Xorg logs as well as a detailed notes file.
> 
> I couldn't do the remaining two combinations because I couldn't get the
> new mgag200 module to compile for the old kernel.
> 
> My previous theory was wrong, but hopefully the attached logs will help
> you work out why the old kernel permitted the high bandwidth mode I
> always use (despite returning MODE_BAD) and the new kernel doesn't.

Thanks for providing all these logs.

But I cannot really figure out why this works in the unmodified old 
kernel. In log 8, I can see an error at time 78.509.  That's the failed 
modeset operation. With the new driver, you get a lower resolution then?
It's not clear to me why X even tried 1440x900 at all. It should not be 
in the list of available modes.

Best regards
Thomas

> 
> (The "old" kernel is 9.1, i.e. 5.14.0-162.6.1.el9_1.0.1, and "new"
> kernel is 9.2, i.e. 5.14.0-284.18.1.el9_2 .)
> 
> Best wishes,
> Roger.
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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