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

[Thomas Zimmermann <tzimmermann@suse.de>]

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Hi

Am 02.09.22 um 07:52 schrieb Wang Yugui:
> Hi,
> 
> mgag200 broken on kernel-6.0-rc3 on DELL/T620.
> 
> See the attachementment file for the graph output.

Thanks for reporting the bug. We recently refactored some code of the 
driver. Can you bisect to the change that introduced the problem?

Best regards
Thomas

> 
> [root@T620 ~]# dmesg  |grep -i 'vga\|mga'
> [    0.588940] Console: colour VGA+ 80x25
> [    4.918214] pci 0000:0a:00.0: vgaarb: setting as boot VGA device
> [    4.919028] pci 0000:0a:00.0: vgaarb: bridge control possible
> [    4.919028] pci 0000:0a:00.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
> [    4.941058] vgaarb: loaded
> [    9.385485] mgag200 0000:0a:00.0: vgaarb: deactivate vga console
> [    9.510688] [drm] Initialized mgag200 1.0.0 20110418 for 0000:0a:00.0 on minor 0
> [    9.523145] fbcon: mgag200drmfb (fb0) is primary device
> [    9.641543] mgag200 0000:0a:00.0: [drm] fb0: mgag200drmfb frame buffer device
> 
> 
> more info:
> 1, This DELL/T620 works well with kernel 5.15.63,
>      so this is not a  hardware error.
> 
> 2, DELL/T640 works well with kernel 6.0-rc and 5.15.63.
>      both DELL/T620 and DELL/T640 use the driver 'mgag200'.
> 
> [root@T640 ~]#  dmesg  |grep -i 'vga\|mga'
> [   10.161500] pci 0000:03:00.0: vgaarb: setting as boot VGA device
> [   10.162463] pci 0000:03:00.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
> [   10.176527] pci 0000:03:00.0: vgaarb: bridge control possible
> [   10.182465] vgaarb: loaded
> [   11.832839] fb0: EFI VGA frame buffer device
> [   21.303826] mgag200 0000:03:00.0: vgaarb: deactivate vga console
> [   21.319498] [drm] Initialized mgag200 1.0.0 20110418 for 0000:03:00.0 on minor 0
> [   21.330223] fbcon: mgag200drmfb (fb0) is primary device
> [   21.332140] mgag200 0000:03:00.0: [drm] drm_plane_enable_fb_damage_clips() not called
> [   21.741629] mgag200 0000:03:00.0: [drm] fb0: mgag200drmfb frame buffer device
> 
> Best Regards
> Wang Yugui (wangyugui@e16-tech.com)
> 2022/09/02
> 

-- 
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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