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

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Date:	Tue, 11 Nov 2008 08:50:39 +0000 (GMT)
From:	Dave Airlie <airlied@...ux.ie>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	arrow.ebd@...il.com, linux_kernel <linux-kernel@...r.kernel.org>
Subject: Re: thinkpad x200 X.server not work with gm4500 graphics

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.

Dave.

 > > Thanks.
> 
> > 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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