[Bug 94338] Kernel DRM/i915 init sends eDP panel into self-test loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94338

Francesco Simula <francesco.simula at roma1.infn.it> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |---
             Status|CLOSED                      |REOPENED

--- Comment #38 from Francesco Simula <francesco.simula at roma1.infn.it> ---
I wanted to point that the same exact problem (full-screen cycle of 2 seconds
red, then green, then blue, and loops infinitely the moment the i915/drm driver
gets loaded or activated, unless 'nomodeset' is selected, in which case the
desktop is unable to go to resolutions higher than 1024x768) still appears on a
machine similar to that of the original poster (mine is an HP ProOne 400 G3
All-in-One with Kaby Lake i3-7100T with built-in connected via eDP, as reported
by the Intel utility once Windows is booted), either with a 4.16.3 kernel on a
USB-booted rescue system and with a 4.17.4 kernel on a USB-booted Fedora 28
live image.

As reported by juridan - whom I must thank for giving me a way to at least
bypass the problem which made installing Linux on this machine pointless -
setting both legacy support and Secure boot to DISABLE in the BIOS overcomes
the problem (the USB-boot rescue system gets to 1600x900 desktop correctly; I
didn't try the Fedora live image but I'm sure it would behave the same).

I'd like to help in diagnosing and fixing this; I must add that the machine is
at my parents' and is currently running Windows (I was not able to install an
OS on it and make it operational otherwise) which can make any trial quite
awkward - every time I tinker with the Secure boot options in the BIOS, the
Windows boot needs fixing...

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