[Bug 95176] LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95176

--- Comment #52 from Erik Ekman <root at kryo.se> ---
I have a Toshiba Portege Z30A-15M with i7-4500U which hangs during boot a few
seconds after the window to enter the root partition encryption key is shown.

4.5 works fine, and I found this change by bisecting. (03b7b5f983091bca1,
drm/i915/psr: Try to program link training times correctly)

00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated
Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        Subsystem: Toshiba America Info Systems Device 0005
        Flags: bus master, fast devsel, latency 0, IRQ 44
        Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3000 [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
        Kernel modules: i915

Using the enable_psr=0 argument makes my machine boot normally with later
kernels.

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