linux-kernel - Re: thinkpad x200 X.server not work with gm4500 graphics

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Date:	Thu, 13 Nov 2008 05:53:17 +0800
From:	arrow.ebd@...il.com
To:	Dave Airlie <airlied@...ux.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, arrow.ebd@...il.com,
	linux_kernel <linux-kernel@...r.kernel.org>
Subject: Re: thinkpad x200 X.server not work with gm4500 graphics

On Tue, Nov 11, 2008 at 08:50:39AM +0000, Dave Airlie wrote:
> On Tue, 11 Nov 2008, Andrew Morton wrote:
> 
> > On Mon, 10 Nov 2008 23:25:18 +0800 arrow.ebd@...il.com wrote:
> > 
> > > deal,
> > > 
> > >     My thinkpad x200's X.server can not startup on the kernel 2.6.28,
> > 
> > Were any earlier kernels OK?  If so, which version(s)?
> What userspace Intel X driver is in use? afaik the GM45 wasn't supported 
> until after we fixed this issue. Hacking around the size in the kernel 
> won't actually fix the problem it actually makes a lot of things a lot 
> worse.

My video-driver is "xf86-video-intel 2.3.2",
and "X.Org X Server 1.4.2", my distribution is Archlinux.
The patch's size is calculated with the dmesg from kernel-2.6.27.
My lap-top computer work now, but I'm not sure that, So is there any
specification about it or any suggestion, I'm glad to do some test on
it.

> > 
> > > and dmesg will show as below:
> > >     -->>--
> > >     [drm] Initialized drm 1.1.0 20060810
> > >     pci 0000:00:02.0: power state changed by ACPI to D0
> > >     pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> > >     pci 0000:00:02.0: setting latency timer to 64
> > >     [drm] Initialized i915 1.6.0 20060119 on minor 0
> > >     pci 0000:00:02.0: pg_start == 0x00001f7f, intel_private.gtt_entries == 0x00001fff
> > >     pci 0000:00:02.0: trying to insert into local/stolen memory
> > >     --<<--
> > > 
> > >     Then, I change file "drivers/char/agp/intel-agp.c" as this:
> > >     -->>--
> > >     --diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
> > >     index 9cf6e9b..e681f75 100644
> > >     --- a/drivers/char/agp/intel-agp.c
> > >     +++ b/drivers/char/agp/intel-agp.c
> > >     @@ -528,7 +528,8 @@ static void intel_i830_init_gtt_entries(void)
> > >                      * stolen, ignore it in stolen gtt entries counting.  However,
> > >                      * 4KB of the stolen memory doesn't get mapped to the GTT.
> > >                      */
> > >     -               size = 4;
> > >     +               /* size = 4; */
> > >     +               size = 516;
> > >             } else {
> > >                     /* On previous hardware, the GTT size was just what was
> > >                      * required to map the aperture.
> > >     --<<--
> > > 
> > >     And Xorg can start now.
> > > (1) Is it correct ?
> > >     Because older kernel use size as "512 + 4" at here, but now use "size = 4".
> > > (2) How to deal with it if the patch is not right ?
> > > (3) How to get more specification about gm4500 ?
> > 
> > 
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