Re: Intel graphics and kernel RT failure

[Mark Knecht <markknecht@gmail.com>]

On Fri, Jun 5, 2009 at 8:07 AM, Jan Engelhardt<jengelh@medozas.de> wrote:
>
> On Friday 2009-06-05 03:14, Sven-Thorsten Dietrich wrote:
>>On Fri, 2009-06-05 at 00:21 +0200, Jan Engelhardt wrote:
>>>
>>> Cc'ing linux-rt. Mabye someone has a flash of an idea.
>>>
>>> On Thursday 2009-06-04 23:42, Hector Centeno wrote to Jan Engelhardt:
>>> >
>>> >I hope it is OK to contact you directly to this email. I've been
>>> >trying to use your 2.6.29 RT kernel for OpenSuse 11.1 and came across
>>> >some problems related to the Intel graphics driver (I have a laptop
>>> >with intel GMA 950). The problem seems to be related to the new intel
>>> >driver development that is going on and that seems to affect older
>>> >hardware like mine. I get a constantly growing list of errors in
>>> >/var/log/mesages like these:
>>> >
>>
>>Try this patch:
>>
>>Signed-off-by: Sven-Thorsten Dietrich <sdietrich@suse.de>
>>
>>Index: b/arch/x86/mm/iomap_32.c
>>===================================================================
>>--- a/arch/x86/mm/iomap_32.c
>>+++ b/arch/x86/mm/iomap_32.c
>>@@ -38,7 +38,7 @@ void *kmap_atomic_prot_pfn(unsigned long
>>-      idx = type + KM_TYPE_NR * smp_processor_id();
>>+      idx = type + KM_TYPE_NR * raw_smp_processor_id();
>>@@ -69,7 +69,7 @@ void
>>-      enum fixed_addresses idx = type + KM_TYPE_NR*smp_processor_id();
>>+      enum fixed_addresses idx = type + KM_TYPE_NR*raw_smp_processor_id();
>
> Yes, it does fix the problem. Enabling PAE and not having applied
> this patch also produces a working system for the original poster.
>
> My thought was that this function kmap_atomic_prot_pfn is not used,
> or used differently, under PAE. Could this be?

I have a system that's got an Intel chip on-board. It started failing
in strange ways when Gentoo decided that xorg-server-1.5 should go
stable and a newer version of the intel-video driver came along with
it. Searching around I found people saying turn on PAE, turn off PAE,
that it had nothing to do with PAE. I got the same failures on both
the standard and rt kernels. There are a number of bugs reported at
the Xorg site about this recent driver.

After 3 weeks of no MythTV on that machine I gave up and bought a
newer NVidia card. No problems since.

Just info.

cheers,
Mark
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