linux-kernel - [REGRESSION BISECTED] System hang during hibernation on EeePC 1015PE

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Date:	Tue, 28 Jul 2015 18:51:37 +0300
From:	Eugene Shatokhin <eugene.shatokhin@...alab.ru>
To:	Imre Deak <imre.deak@...el.com>
Cc:	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: [REGRESSION BISECTED] System hang during hibernation on EeePC 1015PE

Hi,

On ASUS EeePC 1015PE with kernel 3.18 - 4.1, there is a problem very 
similar to the one fixed for Lenovo by the following commit in the 
mainline kernel:

    commit ab3be73fa7b43f4c3648ce29b5fd649ea54d3adb
    drm/i915: gen4: work around hang during hibernation

When I try to put the system to hibernation, the hibernation image is 
created, the screen turns off but the laptop does not turn off after 
that (the fan continues to work, the leds are on, etc.) and the system 
seems to hang.

The laptop has Atom CPU N455 and an integrated graphics controller (PCI 
ID: 8086-a011-1043-83ac) managed by i915 module.
Detailed information about the hardware, as well as dmidecode, logs and 
other data is available here: 
http://hw.rosalinux.ru/index.php?probe=1c0329fde5

Bisection of the mainline git tree pointed to the same "bad" commit as 
it was for Lenovo:

    commit da2bc1b9db3351addd293e5b82757efe1f77ed1d
    drm/i915: add poweroff_late handler

If I revert that change, hibernation works well.

Regards,
Eugene

-- 
Eugene Shatokhin, ROSA
www.rosalab.com
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