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

[Marcin Owsiany]

2018-07-20 22:22 GMT+02:00 Rodrigo Vivi <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:
https://lists.freedesktop.org/archives/intel-gfx/2018-July/171922.html

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? ;-)


> 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
while I was not yet subscribed to the list.
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