[Intel-gfx] Intel i915 corruption issue Gnome EOG #146

[Joonas Lahtinen]

Quoting Jonny Grant (2020-10-30 16:05:02)
> 
> 
> On 30/10/2020 10:54, Chris Wilson wrote:
> > Quoting Joonas Lahtinen (2020-10-30 10:17:17)
> >> + intel-gfx mailing list
> >>
> >> Quoting Joonas Lahtinen (2020-10-30 12:15:44)
> >>> Quoting Jonny Grant (2020-10-27 22:42:19)
> >>>> Hello Jani, Joonas
> >>>>
> >>>> https://gitlab.gnome.org/GNOME/eog/-/issues/146
> >>>>
> >>>> Is this issue something you could debug?
> >>>
> >>> Can you file a bug according to the instructions here with details
> >>> about the hardware:
> >>>
> >>> https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs
> >>>
> >>>> I've got some screenshots
> >>>>
> >>>>
> >>>>
> >>>> Seems to be above 32bit.
> >>>>
> >>>> https://gitlab.gnome.org/GNOME/eog/-/issues/150#note_946421
> >>>>
> >>>> If you don't think it is an i915 issue, could you post a comment?
> >>>> It only reproduces on intel i915 chipset laptops
> >>>
> >>> Quite a few components are involved, so it might also be a bug in the
> >>> Mesa 3D side.
> >>>
> >>> An useful excercise would be to figure out the exact pixel width after
> >>> which the contents is clipped. I noticed one reporting user is using
> >>> Thinkpad X220, have any users of more modern hardware reported similar
> >>> issue?
> > 
> > Large pixmap support was dropped from glamor, -modesetting can only
> > support images up to the HW surface limit. It is a functional
> > regression.
> > -Chris
> > 
> 
> Hell Chris, Joonas
> 
> Thank you for your reply.
> 
> May I ask if you can reproduce the issue on one of your developer machines at Intel? so we can rule in/out intel graphics...

Chris's reply indicates that this is a problem in the higher software
layers. There is a maximum texture size the HW can support, and
previously it has been overcome by splitting the image into portions.

I think such image splitting needs to be re-introduced in the upper
software layers.

Regards, Joonas

> Let me know if you have a Gnome desktop with EOG. Let me know if you'd like me to email the image
> Jonny