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nihues
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Joined: 20 May 2003
Posts: 47
Location: Balneário Camboriú / SC

PostPosted: Tue Jul 31, 2007 6:10 pm    Post subject: Solve your agp issues with a kernel patch Reply with quote

Hello people, after almost 1 YEAR trying to figure out what the hell was going on with my agp and linux, I finally found a solution!


Well the problem is, nvidia or ati + agpgart + amd64-agp locks x11 or gives blank screen when entering or is slow fps compared to windows.
Problems related: Linux says agp size wrong, mtrr size is wrong, agp not working, status on agp on nvidia is disabled and related problems and others more...

It's not a nvidia or ati problem, it's a kernel bug not recognizing the agp right.

So, there are 2 choices:
Workaround 1: boot to windows and reboot to linux, then agp is working right... (worked here)
But this is not a good choice isn't? =)

Workaround 2: This is a bug on kernel-source still opened, below thers is the thread of the bug, it has many patches, I tried one for my motherboard and worked for me. Use the patch below to your current kernel source, I used lasted of gentoo-source ~x86 and worked perfect.

I tested only with Asus K8V-X SE, but it should work with all KT800* northbridge, asrock chipsets should work too, but there are more patches for others chipsets, see link in the end.

1. go to /usr/src/linux
2. create a empty file and paste the code below: nano agp_issue

Code:
Index: linux/drivers/pci/quirks.c
===================================================================
--- linux.orig/drivers/pci/quirks.c
+++ linux/drivers/pci/quirks.c
@@ -23,6 +23,20 @@
 #include <linux/acpi.h>
 #include "pci.h"
 
+static void quirk_asrock_agp_aperture(struct pci_dev *dev)
+{
+   u32 aper_base;
+
+   pci_read_config_dword(dev, 0x94, &aper_base);
+   printk("QUIRK aper_base = %x\n", aper_base);
+
+   aper_base &= 0x7f;
+
+   printk("QUIRK aper_base changed to %x\n", aper_base);
+   pci_write_config_dword(dev, 0x94, aper_base);
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x1103, quirk_asrock_agp_aperture);
+
 /* The Mellanox Tavor device gives false positive parity errors
  * Mark this device with a broken_parity_status, to allow
  * PCI scanning code to "skip" this now blacklisted device.


then patch the kernel: patch -p1 < agp_issue

then recompile and install your kernel, make sure agpgart and support for amd64 agp is module or enabled.

in xorg.conf my nvagp is set to 2 now, it was set to 1 (use nvagp) or 0 (disable agp) before, but with 2 (use kernel agp) always got locks or reboots.

What you gain with this? Well, you gain AGP working and performance gain, here is what I got now:

Before:
Quote:
mybox nihues # cat /proc/driver/nvidia/agp/status
Status: Disabled


After:
Quote:
mybox nihues # cat /proc/driver/nvidia/agp/status
Status: Enabled
Driver: AGPGART
AGP Rate: 8x
Fast Writes: Enabled
SBA: Enabled


Quake3 Before: ~82 fps
Quake3 After: ~112fps

It's a ~30% increase in 3d performance! It takes only 10min of your time too :)

There are more patches for other motherboars, but i can only test mine, if u have an agp graphic card and your agp is not working, you shoul look here http://bugzilla.kernel.org/show_bug.cgi?id=6350
Maybe this should be used in gentoo-sources patches? if people could test all the patches on that thread, at least some agp issues could be erased...
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nihues
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Joined: 20 May 2003
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PostPosted: Fri Aug 31, 2007 4:09 pm    Post subject: Reply with quote

well, almost 1000 views, anyone tried? :P
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steveL
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Joined: 13 Sep 2006
Posts: 2164
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PostPosted: Sun Sep 02, 2007 4:36 am    Post subject: Reply with quote

It looks really handy and I've bookmarked it nihues but I don't have an amd64 atm. Nice one though, I'll recommend it to people on IRC.
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coldfinger
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PostPosted: Wed Sep 05, 2007 10:15 am    Post subject: Reply with quote

will test and report back...
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