[Bug 105198] LG 5K Ultrafine display (tiled DP) is not detected correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105198

--- Comment #19 from Tomas Bzatek <bugs at bzatek.net> ---
(In reply to Jose Roberto de Souza from comment #17)
> Tomas Bzatek did you setup xrandr after apply the patch?
> See here: https://github.com/i3/i3/issues/1799#issuecomment-233900476

I did something similar and I can see the newly created monitor in the `xrandr
--listmonitors` output. No difference in mode setting and no change from the
windowmanager side either. I understand the WM needs to be aware of this
logical monitor setup but would it make a difference in KMS, i.e. would it
magically cause the outputs to get synchronized?

Also, is there a difference in DDX driver used? I'm using the legacy intel
driver as modesetting+glamor is noticeably slower. I've tried both anyway with
exactly the same results (tiles out of sync), the only difference was in
display output naming.

That said I'm still seeing hardware sync issues where the panel is perhaps
unable to find and synchronize the first scanlines of the frame. It's probably
specific to the panel controller with perhaps only little delay tolerance
between the inputs. Other panels may allow more tolerance at the expense of
larger input lag.

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