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-   -   X freezes when agp 4x is enabled (http://www.nvnews.net/vbulletin/showthread.php?t=502)

jinksed 08-07-02 02:03 PM

X freezes when agp 4x is enabled
I've had this problem for a while. I have an nvidia geforce 2 mx 400 64mb with tv out that locks when i try using 4x agp. everything works fine if i use 2x. i have an asus tusl2-c mobo(i815 chipset). im using the latest drivers in slackware 8.1 2.4.18.

bash-2.05a# lspci
00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub (rev 04)
00:01.0 PCI bridge: Intel Corp. 82815 815 Chipset AGP Bridge (rev 04)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA PCI Bridge (rev 02)
00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 02)
00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 02)
00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 02)
00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX] (rev b2)
02:0a.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 07)
02:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C (rev 10)
02:0c.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 02)
02:0c.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 02)
02:0d.0 Ethernet controller: D-Link System Inc RTL8139 Ethernet (rev 10)

cat /proc/drvier/nvidia/apg:

Status: Enabled
AGP Rate: 2x
Fast Writes: Disabled
SBA: Disabled

bash-2.05a# cat card
Fast Writes: Supported
SBA: Not Supported
AGP Rates: 4x 2x 1x
Registers: 0x1f000017:0x1f000102

bash-2.05a# cat host-bridge
Host Bridge: Intel i815
Fast Writes: Not Supported
SBA: Supported
AGP Rates: 4x 2x 1x
Registers: 0x1f000207:0x00000102

Thunderbird 08-07-02 04:56 PM

Don't play with things like FW, SBA and the agp rate. 4x is unstable in a lot of cases and compared to 2x it isn't that much faster (max about 1% or a little more) in some cases it is even a little slower. So just stick with 2x. It was a different case if AGP was totally off or only working in 1x.

There's one thing you can do if you really want 4x. Try to use another agp driver. The nvidia drivers support agpgart (linux kernel stuff) and "nvagp" the nt 4.0 agp support that is builtin into the drivers. Check /proc/driver/nvidia/agp what you are using. Then try to switch drivers using the NvAGP option in the XF86Config-4 file. Check the docs for more info on it.

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