linux-kernel - Re: Info: mapping multiple BARs. Your kernel is fine.

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Message-ID: <20140417200352.GB18876@redhat.com>
Date:	Thu, 17 Apr 2014 16:03:52 -0400
From:	Dave Jones <davej@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"Lu, Aaron" <aaron.lu@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephane Eranian <eranian@...gle.com>,
	"Yan, Zheng Z" <zheng.z.yan@...el.com>, daniel.vetter@...ll.ch
Subject: Re: Info: mapping multiple BARs. Your kernel is fine.

On Thu, Apr 17, 2014 at 10:01:27PM +0200, Borislav Petkov wrote:
 > On Thu, Apr 17, 2014 at 03:52:40PM -0400, Dave Jones wrote:
 > > Just as X starts up, I see this in dmesg..
 > > 
 > > [   42.879049] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun
 > 
 > FWIW, I have that too. It should be something i915-related:
 > 
 > [    0.617673] [drm] Memory usable by graphics device = 2048M
 > [    0.694445] i915 0000:00:02.0: irq 42 for MSI/MSI-X
 > [    0.694549] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
 > [    0.694631] [drm] Driver supports precise vblank timestamp query.
 > [    0.695313] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
 > [    0.788300] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to bit banging on pin 5
 > [    0.799829] fbcon: inteldrmfb (fb0) is primary device
 > [    1.176845] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

Can you send me your .config off-list ?
I wonder if this is something config specific that's causing me to see
this, and you not, given we've apparently got similar machines.

	Dave

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