Red Hat Bugzilla – Bug 157991
[PATCH] intel-agp driver not built for x86_64, needed to support i915/i945 chipset
Last modified: 2012-06-20 09:17:32 EDT
Description of problem:
The RHEL4 kernel uses the 'intel-mch-agp' driver on x86_64, not the intel-agp
driver. However, it seems that 'intel-mch-agp' is an obsolete driver. It was
removed in linux-2.6.12-rc1; see the patches titled:
[AGPGART] Drop the Intel-mch AGP driver.
[AGPGART] Enable Intel AGP support for x86-64 again.
The intel-mch-agp driver also lacks support for the i915 chipset found in recent
64-bit capable Intel PCs.
In order for accelerated OpenGL to work on recent x86_64 capable Intel hardware,
the RHEL4 kernel should use the intel-agp driver on x86_64 instead of
Version-Release number of selected component (if applicable):
RHEL4 x86_64 kernel (2.6.9-5.0.5.EL), as well as most recent RHEL4 beta
Steps to Reproduce:
1. try to set up accelerated OpenGL
note that the RHEL4 x86_64 kernel does not support the i915 chipset with agpgart
agpgart should support the same Intel chipsets on x86_64 that it does in i386
I built the intel-agp driver as an external module on x86_64, using the RHEL4
kernel sources (NOT a newer version of the intel-agp driver), and OpenGL worked
fine on my hardware. (pre-production Dell GX620 with i945 on-board graphics, x86_64)
(I added the PCI ID to intel-agp.c for the i945 chip, and it worked fine using
the i915 code)
I'll attach two patches to this bugzilla:
1. Dave Jones's patch to re-enable intel-agp.c for x86_64
2. A patch against kernel-2.6.9-x86_64*.config for RHEL4 to disable the
I guess you should probably also delete the intel-mch-agp driver from the RHEL4
kernel source tree as well.
Created attachment 114471 [details]
[AGPGART] Enable Intel AGP support for x86-64 again. (firstname.lastname@example.org)
patch from linux-2.6.12-rc1 that re-enables intel-agp.c for x86_64
the bitkeeper reference was:
Created attachment 114475 [details]
disable CONFIG_AGP_INTEL_MCH in x86_64 kernel config
Simple patch against SOURCES/kernel-2.6.9-x86_64*.config for the RHEL4 kernel
(patch against 2.6.9-6.37.EL sources)
See also the related bugs:
bug #157995 (support i945G host bridge in intel-agp driver)
bug #157997 (i915 DRM kernel module needed on x86_64)
bug #158000 (support i945G integrated graphics in i915 DRM kernel module)
bug #158014 (support i945G integrated graphics in xorg-x11 i810 driver)
bug #158015 (support i945G integrated graphics in i915 DRI driver)
bug #158016 (disable debugging output to stderr in i915 DRI driver, x86_64)
Taken as a series, when these are all resolved it will be possible to get
working OpenGL acceleration in RHEL4 for the i945G integrated graphics chipset
reassigning to product management.
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