linux-kernel - Re: [PATCH v2] drm/i915: gen4: work around hang during hibernation

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Date:	Wed, 18 Mar 2015 17:22:52 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Imre Deak <imre.deak@...el.com>, intel-gfx@...ts.freedesktop.org,
	Bjørn Mork <bjorn@...k.no>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jani Nikula <jani.nikula@...el.com>,
	David Weinehall <david.weinehall@...ux.intel.com>
Subject: Re: [PATCH v2] drm/i915: gen4: work around hang during hibernation

On Wed, 2015-03-18 at 12:22 +0200, Ville Syrjälä wrote:
> We had another bug report which showed similar problems on something
> as recent as SNB:
> https://bugzilla.kernel.org/show_bug.cgi?id=94241
> So I guess we really want to make the check 'gen < 7'.
> 
> My IVB X1 Carbon doesn't need this quirk, so hopefully that indicates
> the Lenovo BIOSen became more sane for gen7+.

On the other hand my ThinkPad X220 has vendor:device ids 8086:0126,
which makes it a gen6 device (assuming I parsed the various preprocessor
defines in include/drm/i915_pciids.h and drivers/gpu/drm/i915/i915_drv.c
correctly). That laptop is now running v3.19.1 and never hit this issue.


Paul Bolle

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