[Intel-gfx] Can recent i915 support more than 8192x8192 screen?

[Rodrigo Vivi]

On Fri, Jul 20, 2018 at 11:01:38PM +0200, Marcin Owsiany wrote:
>    2018-07-20 22:22 GMT+02:00 Rodrigo Vivi <[1]rodrigo.vivi at intel.com>:
> 
>    On Thu, Jul 19, 2018 at 11:31:19PM +0200, Marcin Owsiany wrote:
>    >     $ xrandr --fb 8960x2880
>    >     xrandr: screen cannot be larger than 8192x8192 (desired size
>    >    8960x2880)
> 
>      I'm afraid that it is a hardware limitation that you won't be able
>      to
>      workaround.
> 
>    Interestingly, just yesterday Ville Syrjälä posted a patch series for
>    "GTT remapping for display",
>    which concludes in this hopeful-looking patch called "Bump gen4+ fb
>    size limits to 32kx32k:
>    [2]https://lists.freedesktop.org/archives/intel-gfx/2018-July/171922.ht
>    ml
>    Which looks oddly similar to what I encountered on reddit.
>    I don't pretend to even understand what "GTT remapping" is, but maybe
>    there is hope after all? ;-)

cool...  I have that series on my todo list here to take a look but I
haven't yet. I'm glad to hear that there's hope.

> 
>      But a log would be interesting anyway... (both dmesg and xorg.0.log)
> 
>    I'll try digging up that patched kernel sometime and get the messages.
> 
>      >    My current workaround is to pretend that the displays are
>      arranged
>      >    vertically, but even after a few months I'm sometimes having
>      trouble
>      >    remembering that I need to move mouse cursor UP when I want to
>      go to
>      >    LEFT display :-)
>      This is another bug.... And probably the right (only?) fixable fr
>      your
>      setup.
> 
>    Why is this a bug? What I meant is that two wide monitors fit
>    within 8192x8192
>    when using xrandr's --above but not --left-of, so I'm just using the
>    former despite
>    having a different physical arrangement.
>    Marcin
>    PS: Sorry for the initial double-post, I thought my first email was
>    blackholed

np... I approved it as soon as I saw it there.
list is open, but I have to filter the non-subscribed emails because of
so many spams...

>    while I was not yet subscribed to the list.
> 
> References
> 
>    1. mailto:rodrigo.vivi at intel.com
>    2. https://lists.freedesktop.org/archives/intel-gfx/2018-July/171922.html

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