[Bug 97244] [DP] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97244

--- Comment #55 from Manasi <manasi.d.navare at intel.com> ---
(In reply to Tomas Bzatek from comment #52)
> (In reply to Diep Pham from comment #51)
> > I bought the LG Ultrafine 5k and with latest kernel (5.2.8-200.fc30.x86_64),
> > the montior is detected correctly and works without any problem. Although,
> > the maximum resolution is only 4096x2304, not 5120 × 2880.
> 
> Yes, same as with the Dell UP2715K - the 4k resolution is the preferred one
> as a fallback. You need to manually set 2560x2880 on both outputs.
> 
> Since the LG Ultrafine 5K is a TB3 monitor, I suppose you see two panels
> attached. Please verify that the 2560x2880 resolution is available on both.

Hi Tomas,

This issue with 5K tiled display synchronization should be fixed on the ICL+
based Intel graphics that has a transcoder port sync feature to synchronize the
vblanks and timings on both ports. Please see the patch series on the M-L:
https://patchwork.kernel.org/project/intel-gfx/list/?series=137339

We are also working on trying to find an alternate solution to avoid this
screen corruption on older platforms.

Manasi

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