[Bug 97220] miss detect monitor. dell UP3214Q

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97220

--- Comment #7 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
(In reply to kenneth johansson from comment #6)
> I have no idea what a tiled display is.

I believe it means, that there are actually two panels.

> If I use the Intel display port I get or more correctly used to get two
> displays that I could then combine with xrandr into one larger. Now the
> kernel driver presents just the combined one directly no need to manually do
> anything.

I have the same monitor. With Linux 4.17 and 4.18 at least GDM 3.28 and 3.30
are correctly displayed over the full screen. Could you please retest?

PS: The monitor, unfortunately, only gives problems with the free drivers
(Intel and AMDGPU) and firmware (UEFI of MSI B350M MORTAR (MS-7A37)). I believe
it’s the monitor firmware, but my colleagues say, they do *not* have any
problems with the proprietary Nvidia drivers and Microsoft Windows. So, it’s
either a bug in the free drivers, or the proprietary drivers work around it
somehow.

Here are my bug reports for that. I do not know if these are specific drivers
bugs or in the generic DRM code.

[1]: https://bugs.freedesktop.org/show_bug.cgi?id=107607
[2]: https://bugs.freedesktop.org/show_bug.cgi?id=107845

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