[Bug 107845] Problems with (tiled) MST display (Dell UP3214Q)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107845

--- Comment #4 from Paul Menzel <pmenzel+bugs.freedesktop at molgen.mpg.de> ---
Created attachment 141501
  --> https://bugs.freedesktop.org/attachment.cgi?id=141501&action=edit
Linux 4.19-rc2+ (drm-tip) messages

(In reply to Stanislav Lisovskiy from comment #3)
> Which desktop manager/X Server version is used here? 

Xfce 4.13 and X.Org X Server 1.19.6.

> Lakshmi, it looks like this is something different, most likely those are
> multiple bugs.

Agreed. Unfortunately, there is also an issue with the graphics driver in the
UEFI firmware, that it often is not able to initialize the display. So Linux’
UEFI frame buffer driver doesn’t display anything.

So, let’s make the bug about the issue, that the Linux kernel (not user space)
Intel graphics driver i915 is not able to initialize the display when loaded.

I jumped through the hoops to build latest drm-tip. Please find the log with
`drm.debug=0x1e` attached.

Hopefully, the logs are useful, so that we do not have to guess, what’s going
wrong.

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