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

[Wang Yugui]

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?

5.19.3 works well on this DELL/T620.

so this problem should be a regression of 6.0.

other bisect seem difficult for me.

Best Regards
Wang Yugui (wangyugui at e16-tech.com)
2022/09/07


> 
> Best regards
> Thomas
> 
> >
> > [root at 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 at 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 at 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)
> Gesch?ftsführer: Ivo Totev