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: <davej.org> [AGPGART] Drop the Intel-mch AGP driver. <davej> [AGPGART] Enable Intel AGP support for x86-64 again. (from http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.12-rc1) 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 intel-mch-agp. 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 (2.6.9-6.37.EL). How reproducible: Always Steps to Reproduce: 1. try to set up accelerated OpenGL Actual results: note that the RHEL4 x86_64 kernel does not support the i915 chipset with agpgart Expected results: agpgart should support the same Intel chipsets on x86_64 that it does in i386 Additional info: I built the intel-agp driver as an external module on x86_64, using the RHEL4 kernel sources (NOT a newer version of the intel-agp driver), and OpenGL worked fine on my hardware.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 intel-mch-agp driver. 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. (davej) patch from linux-2.6.12-rc1 that re-enables intel-agp.c for x86_64 the bitkeeper reference was: http://linus.bkbits.net:8080/linux-2.5/cset@42371da7yKUNulXzstCcwodtXIg9cA
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 on x86_64.
reassigning to product management.
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