Bug 3858 - KM400A resolution problem
Summary: KM400A resolution problem
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/Via (show other bugs)
Hardware: x86 (IA32) Linux (All)
: high normal
Assignee: Xorg Project Team
QA Contact:
Keywords: have-backtrace
Depends on:
Reported: 2005-07-24 08:33 UTC by Sandor Tot
Modified: 2005-07-23 11:32 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


Description Sandor Tot 2005-07-24 08:33:24 UTC
Hello !

I have an AOpen vKM400Am-S motherboard with VIA IGP, the AOpen is call KM400A. I
use Gentoo with Xorg I didn't use the X correct on 1024x768 24bpp,
just smaller resolution, until to the next correction. I read on a Debian
mailinglist. Sorry for my not too good english.



case VIA_KM400:
	if (pVia->ChipRev < 0x8F)
	    return ViaBandwidthTable[VIA_BW_KM400].Bandwidth[pVia->MemClk];
	    return ViaBandwidthTable[VIA_BW_KM400A].Bandwidth[pVia->MemClk];


	if (pVia->ChipRev < 0x84)

lspci and xorg.log :

0000:01:00.0 VGA compatible controller: VIA Technologies, Inc. VT8378 [S3
UniChrome] Integrated Video (rev 01) (prog-if 00 [VGA])
        Subsystem: VIA Technologies, Inc. VT8378 [S3 UniChrome] Integrated Video
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
        Status: Cap+ 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
        Latency: 32 (500ns min)
        Interrupt: pin A routed to IRQ 10
        Region 0: Memory at e4000000 (32-bit, prefetchable) [size=64M]
        Region 1: Memory at ea000000 (32-bit, non-prefetchable) [size=16M]
        Capabilities: [60] Power Management version 2
                Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [70] AGP version 2.0
                Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans-
64bit- FW- AGP3- Rate=x1,x2,x4
                Command: RQ=1 ArqSz=0 Cal=0 SBA- AGP- GART64- 64bit- FW- Rate=<none>

(--) VIA(0): Chipset: "KM400/KN400"
(--) VIA(0): mapping MMIO @ 0xea000000 with size 0x9000
(--) VIA(0): mapping BitBlt MMIO @ 0xea200000 with size 0x10000
(II) VIA(0): vgaHWGetIOBase: hwp->IOBase is 0x03d0, hwp->PIOOffset is 0x0000
(--) VIA(0): Chipset Rev.: 132
(WW) VIA(0): Manufacturer plainly copied main PCI ids to Subsystem/Card ids.
(--) VIA(0): Detected Biostar iDEQ 200V/Chaintech 7VIF4.
(==) VIA(0): Using gamma correction (1.0, 1.0, 1.0)
(--) VIA(0): videoram =  16384k
Comment 1 Luc Verhaegen 2005-07-24 21:32:25 UTC
This was first reported by Tom Huckstep on #xorg. I've now commited my fix,
together with a sync polarity issue i came across when reviewing code.

The warning there is bashing idiot manufacturers for ignoring/borking pci
subsystem/card ids. Nothing to worry about, but you should consider other
hardware manufacturers for future purchases.

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