linux-kernel - Re: [TIP,regression,i915] /dev/dri/card0 is no longer present

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Date:	Tue, 3 Mar 2009 14:50:40 +0000
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [TIP,regression,i915] /dev/dri/card0 is no longer present

On Mon, Mar 02, 2009 at 11:05:58AM -0800, Pallipadi, Venkatesh wrote:
> On Sun, 2009-03-01 at 05:48 -0800, Sitsofe Wheeler wrote:
> > On Sun, Mar 01, 2009 at 12:39:48PM +0100, Ingo Molnar wrote:
> > >
> > > Thanks, i've reverted the commit for now. Could you please send
> > > a 'dmesg' from the bootup with the failed driver? By all
> > > likelyhood an ioremap failure causes a driver failure.
> > >
> > 
> > See below (drm says it initalized though...):
> > 
> > [    0.000000] Linux version 2.6.29-rc6-00006-g17581ad (@verona) (gcc version 4.2.4) #87 Sun Mar 1 13:42:28 GMT 2009
> > [    0.000000] KERNEL supported cpus:
> > [    0.000000]   Intel GenuineIntel
> > [    0.000000] PAT WC disabled due to known CPU erratum.
> 
> Looks like PAT is getting disabled on this platform. Can you send the
> output of /proc/cpuinfo please.

The machine has a stepping of the Celeron M chip in it with PAT errata.
I think it becomes disabled  because it would require a careful code to
ensure that WC was only used in circumstances where the errata would not
matter...

Here's the contents of /proc/cpuinfo:
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 13
model name	: Intel(R) Celeron(R) M processor          900MHz
stepping	: 8
cpu MHz		: 900.074
cache size	: 512 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx bts
bogomips	: 1800.14
clflush size	: 64
power management:

-- 
Sitsofe | http://sucs.org/~sits/
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