Bug 130842 – svgalib on nVidia GeForce MX 4000 is geting maximal VertRefresh wrong

• Status: RESOLVED UPSTREAM
• Product: Gentoo Linux

[Description Honza 2006-04-22 08:47:48 UTC]

svgalib on nVidia GeForce MX 4000 is geting maximal VertRefresh wrong. My monitor can do 160Hz so I had 160Hz there (with GeForce 200MX). Now with GeForce MX 4000 svgalib sets 200Hz 512x384 mode unless I set it to lower value like 80Hz (then 140Hz is used).

svgalib 1.9.21 and svgalib 1.9.24 was tested.

[Comment 1 Honza 2006-04-22 09:06:57 UTC]

Update: it's also true about HorizSync. Only way to stop it from using 96kHz for 1072x600 (highest mode of vgatest available) was setting maximal horizsync to 47kHz ... (original value and limit of monitor is 95kHz).

[Comment 2 Honza 2006-04-22 09:10:11 UTC]

Just in case:
lspci -v:

00:00.0 Host bridge: VIA Technologies, Inc. K8T800Pro Host Bridge
        Subsystem: VIA Technologies, Inc. Unknown device 3282
        Flags: bus master, 66MHz, medium devsel, latency 8
        Memory at d0000000 (32-bit, prefetchable) [size=64M]
        Capabilities: [80] AGP version 3.0
        Capabilities: [50] Power Management version 2
        Capabilities: [60] HyperTransport: Slave or Primary Interface
        Capabilities: [58] HyperTransport: Interrupt Discovery and Configuration

01:00.0 VGA compatible controller: nVidia Corporation NV18 [GeForce4 MX 4000 AGP 8x] (rev c1) (prog-if 00 [VGA])
        Subsystem: ASUSTeK Computer Inc. Unknown device 8193
        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 11
        Memory at cc000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (32-bit, prefetchable) [size=128M]
        Expansion ROM at cdee0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 2
        Capabilities: [44] AGP version 3.0

[Comment 3 SpanKY 2006-04-22 10:09:50 UTC]

you'll have better luck if you try posting to the svgalib group upstream:
http://groups.google.com/group/svgalib

[Comment 4 Honza 2006-04-22 10:32:47 UTC]

Thanks for tip. This is how I think bugzilla should work - if you can't help, at least you know & tell who can.

[Comment 5 Honza 2006-04-24 12:44:10 UTC]

UPDATE: Its not only VertRefresh and HorizSync. Svgalib simply can't detect some frequency correctly and everything is double of what it thinks is setting. 
Recomended by developer: this is probably incorrect PLL frequency detection. You can add in the file svgalib-1.9.24/src/drivers/nv3.c in line 817:

PLL_INPUT_FREQ *= 2 ;

(end of recomend)
I suppose there should be some "if" around it, but don't know what and don't have enough cards to test. I hope developer HAVE enough cards (or reports of).

[Comment 6 SpanKY 2006-07-16 00:09:22 UTC]

upstream's business