[Bug 91378] Intel nuc with kernel commit 06ea66b6 gets display into sleep

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91378

--- Comment #6 from Adrian Sandu <adrian.sandu at asandu.eu> ---
In case it matters:
The OS is Gentoo x86_64
The kernel is 4.1.1 with gentoo patches and aufs patches on top.
The bisect I attached is of vanilla kernel straight from linus git.
The attached patch works ( limiting the resolution to 2560x1440 ) on my
4.1.1+gentoo+aufs kernel.
The monitor is a Dell P2415Q (
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=860-BBFF
) connected via DP to an Intel NUC D54250WYKH (
https://www-ssl.intel.com/content/www/us/en/nuc/nuc-kit-d54250wykh.html )
miniDP.
The CPU is an I5-4250U.
The GPU is an Intel HD 5000 with 256 ram ( shared from the main RAM probably )

d3xbucharest ~ # lspci -v -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 2054
        Flags: bus master, fast devsel, latency 0, IRQ 40
        Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915

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