I recently discussed with NVidia about how `options NVdriver NVreg_ReqAGPRate=2` in /etc/modules.d/nvidia doesn't set the AGP rate to 2x As it turns out, the variable is disabled in the source code. I simply had to remove the `__` from the line containing `__ReqAGPRate` to enable the module option. this of course only goes into effect if one is using the NVidia AGP driver instead of the default kernel one. Reproducible: Always Steps to Reproduce: 1. emerge nvidia-kernel 2. modprobe NVidia 3. cat /proc/drivers/nvidia/agp/status Actual Results: It revealed that the NVidia AGP driver was only using 1x AGP instead of using the bridge to it's full potential. Expected Results: It should have displayed that AGP 2x was enabled Quote from NVidia: *************** unfortunately our documentation is wrong on changing that variable. are you building your own kernel module from the tarballs? You need to edit os-registry.c, find the line that has __ReqAGPRate, remove the leading "__" and recompile. While you're at it, you can change the value of ReqAGPRate in that file to '2', so you don't need to pass the value as a kernel parameter. Terence **************************************** I'm not sure of the stability of this option, but it's been working fine so far.
It's been a long time since ant changes were made to this bug. I wasn't able to reproduce the problem. My card is working correctly in x4 mode. Please test again with the latest versions and reopen this bug if the problem persists.
this seems to be fixed in the latest version ...
root@vapier 0 root # ebuild nvidia-kernel-1.0.4496-r4.ebuild clean unpack root@vapier 0 nv # pwd /var/tmp/portage/nvidia-kernel-1.0.4496-r4/work/NVIDIA-Linux-x86-1.0-4496-pkg2/usr/src/nv root@vapier 0 nv # grep ReqAGPRate os-registry.c * Option: ReqAGPRate static int NVreg_ReqAGPRate = 7; NV_MODULE_PARAMETER(NVreg_ReqAGPRate); { NULL, "ReqAGPRate", &NVreg_ReqAGPRate, 0 }, also, i set agp rate to 4x in my modules conf file and i have this: root@vapier 0 nv # cat /proc/driver/nvidia/agp/status Status: Enabled Driver: NVIDIA AGP Rate: 4x Fast Writes: Enabled SBA: Disabled
