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SubjectRe: VIA Northbridge Workaround in 2.4.18 Causing Video Problems
I second this.  Experienced almost exactly the same thing with a
2.4.18-pre2 kernel. Removing my board from the
arch/i386/kernel/pci-pc.c file (I believe) fixed the problem.

On Tue, Feb 26, 2002 at 11:57:30AM -0800, Tom Eastep wrote:
>
>
> [1.] One line summary of the problem:
>
> The VIA Northbridge workaround in 2.4.18 (arch/i386/kernel/pci-pc.c:pci_fixup_via_northbridge_bug)
> is causing Video Problems on one of my systems.
>
> [2.] Full description of the problem/report:
>
> System is an Athlon 1.2GZ with VIA KT133 Northbridge and VT82C686 Southbridge. This is a
> Compaq Presario with onboard S3 Savage Video that uses 8 or 16mb of system RAM as Video
> RAM. Prior to my installing 2.4.18, I have experienced none of the Athlon/VIA problems
> that have plagued other users (including the one addressed by the workaround).
>
> With 2.4.18:
>
> a) VGA console goes berserk during boot (random fixed pattern appears and console is unusable).
> b) Vesafb console and X (XF86_FBDEV) -- Heavy memory access (either from CPU or disk activity)
> produces flicker and horizontal white "noise" on the Display. The amount of flicker and
> noise is proportional to memory activity.
>
> I have definitely determined that the problem is with the VIA Workaround as
> the symptoms are eliminated when I disable the workaround (see hack below).
>
> [3.] Keywords (i.e., modules, networking, kernel):
> Video VIA Workaround
> [4.] Kernel version (from /proc/version):
> Linux version 2.4.18 (teastep@ursa.shorewall.net) (gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)) #2 Tue Feb 26 07:24:29 PST 2002
>
> [5.] Output of Oops.. message (if applicable) with symbolic information
> resolved (see Documentation/oops-tracing.txt)
> N/A
> [6.] A small shell script or example program which triggers the
> problem (if possible)
> N/A
> [7.] Environment
> [7.1.] Software (add the output of the ver_linux script here)
>
> Linux ursa.shorewall.net 2.4.18 #2 Tue Feb 26 07:24:29 PST 2002 i686 unknown
>
> Gnu C 2.96
> Gnu make 3.79.1
> util-linux 2.11f
> mount 2.11g
> modutils 2.4.13
> e2fsprogs 1.23
> PPP 2.4.1
> isdn4k-utils 3.1pre1
> Linux C Library 2.2.4
> Dynamic linker (ldd) 2.2.4
> Procps 2.0.7
> Net-tools 1.60
> Console-tools 0.3.3
> Sh-utils 2.0.11
> Modules Loaded via82cxxx_audio ac97_codec uart401 sound parport_pc lp parport tulip usb-storage nls_iso8859-1 nls_cp437 vfat fat mousedev keybdev hid input usb-uhci usbcore
>
> [7.2.] Processor information (from /proc/cpuinfo):
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 6
> model : 4
> model name : AMD Athlon(tm) Processor
> stepping : 2
> cpu MHz : 1202.134
> cache size : 256 KB
> fdiv_bug : no
> hlt_bug : no
> f00f_bug : no
> coma_bug : no
> fpu : yes
> fpu_exception : yes
> cpuid level : 1
> wp : yes
> flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov
> pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
> bogomips : 2398.61
> [7.3.] Module information (from /proc/modules):
> via82cxxx_audio 18048 8 (autoclean)
> ac97_codec 9440 0 (autoclean) [via82cxxx_audio]
> uart401 6368 0 (autoclean) [via82cxxx_audio]
> sound 55884 0 (autoclean) [via82cxxx_audio uart401]
> parport_pc 25896 1 (autoclean)
> lp 6240 0 (autoclean)
> parport 24576 1 (autoclean) [parport_pc lp]
> tulip 39680 1
> usb-storage 22140 0
> nls_iso8859-1 2816 1 (autoclean)
> nls_cp437 4320 1 (autoclean)
> vfat 9852 1 (autoclean)
> fat 31096 0 (autoclean) [vfat]
> mousedev 4128 1
> keybdev 1856 0 (unused)
> hid 12992 0 (unused)
> input 3264 0 [mousedev keybdev hid]
> usb-uhci 21316 0 (unused)
> usbcore 49472 1 [usb-storage hid usb-uhci]
> [7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
> 0000-001f : dma1
> 0020-003f : pic1
> 0040-005f : timer
> 0060-006f : keyboard
> 0070-007f : rtc
> 0080-008f : dma page reg
> 00a0-00bf : pic2
> 00c0-00df : dma2
> 00f0-00ff : fpu
> 0170-0177 : ide1
> 01f0-01f7 : ide0
> 0376-0376 : ide1
> 0378-037a : parport0
> 03c0-03df : vesafb
> 03f6-03f6 : ide0
> 03f8-03ff : serial(auto)
> 0cf8-0cff : PCI conf1
> 1000-10ff : Lite-On Communications Inc LNE100TX
> 1000-10ff : tulip
> 1400-14ff : VIA Technologies, Inc. AC97 Audio Controller
> 1400-14ff : via82cxxx_audio
> 1800-183f : PCTel Inc HSP MicroModem 56
> 1840-185f : VIA Technologies, Inc. UHCI USB
> 1840-185f : usb-uhci
> 1860-187f : VIA Technologies, Inc. UHCI USB (#2)
> 1860-187f : usb-uhci
> 1880-188f : VIA Technologies, Inc. Bus Master IDE
> 1880-1887 : ide0
> 1888-188f : ide1
> 1890-1893 : VIA Technologies, Inc. AC97 Audio Controller
> 1890-1893 : via82cxxx_audio
> 1894-1897 : VIA Technologies, Inc. AC97 Audio Controller
> 1894-1897 : via82cxxx_audio
> ec00-ec0f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
> ee00-eeff : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
> CPU0
> 0: 120510 XT-PIC timer
> 1: 6 XT-PIC keyboard
> 2: 0 XT-PIC cascade
> 5: 4826 XT-PIC eth0
> 8: 1 XT-PIC rtc
> 9: 2 XT-PIC acpi
> 10: 8473 XT-PIC via82cxxx
> 11: 10879 XT-PIC usb-uhci, usb-uhci
> 14: 12635 XT-PIC ide0
> 15: 10 XT-PIC ide1
> NMI: 0
> ERR:
> [7.5.] PCI information ('lspci -vvv' as root)
> 00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 81)
> 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: 0
> Region 0: Memory at 90000000 (32-bit, prefetchable) [size=64M]
> Capabilities: [a0] AGP version 2.0
> Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
> Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
> Capabilities: [c0] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP] (prog-if 00 [Normal decode])
> 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: 0
> Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
> Memory behind bridge: 80000000-800fffff
> Prefetchable memory behind bridge: 88000000-8fffffff
> BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
> Capabilities: [80] Power Management version 2
> Flags: PMEClk- DSI- D1+ D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:04.0 Modem: PCTel Inc HSP MicroModem 56 (rev 02) (prog-if 01 [Hayes/16450])
> Subsystem: PCTel Inc: Unknown device 0001
> 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-
> Interrupt: pin A routed to IRQ 10
> Region 0: I/O ports at 1800 [size=64]
> Capabilities: [40] Power Management version 2
> Flags: PMEClk- DSI+ D1- D2+ AuxCurrent=55mA PME(D0+,D1-,D2+,D3hot+,D3cold+)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:05.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
> Subsystem: Netgear FA310TX
> 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: 66
> Interrupt: pin A routed to IRQ 5
> Region 0: I/O ports at 1000 [size=256]
> Region 1: Memory at a0000000 (32-bit, non-prefetchable) [size=256]
> Expansion ROM at <unassigned> [disabled] [size=256K]
>
> 00:14.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 22)
> 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: 0
>
> 00:14.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 10) (prog-if 8a [Master SecP PriP])
> 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: 64
> Region 4: I/O ports at 1880 [size=16]
> Capabilities: [c0] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:14.2 USB Controller: VIA Technologies, Inc. UHCI USB (rev 10) (prog-if 00 [UHCI])
> Subsystem: Unknown device 0925:1234
> 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: 66, cache line size 08
> Interrupt: pin D routed to IRQ 11
> Region 4: I/O ports at 1840 [size=32]
> Capabilities: [80] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:14.3 USB Controller: VIA Technologies, Inc. UHCI USB (rev 10) (prog-if 00 [UHCI])
> Subsystem: Unknown device 0925:1234
> 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: 66, cache line size 08
> Interrupt: pin D routed to IRQ 11
> Region 4: I/O ports at 1860 [size=32]
> Capabilities: [80] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:14.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 30)
> 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-
> Capabilities: [68] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 00:14.5 Multimedia audio controller: VIA Technologies, Inc. AC97 Audio Controller (rev 20)
> Subsystem: Compaq Computer Corporation: Unknown device 003d
> 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-
> Interrupt: pin C routed to IRQ 10
> Region 0: I/O ports at 1400 [size=256]
> Region 1: I/O ports at 1890 [size=4]
> Region 2: I/O ports at 1894 [size=4]
> Capabilities: [c0] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
>
> 01:00.0 VGA compatible controller: S3 Inc.: Unknown device 8a26 (prog-if 00 [VGA])
> Subsystem: Compaq Computer Corporation: Unknown device 005b
> 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: 64 (1000ns min, 63750ns max), cache line size 08
> Interrupt: pin A routed to IRQ 3
> Region 0: Memory at 80000000 (32-bit, non-prefetchable) [size=512K]
> Region 1: Memory at 88000000 (32-bit, prefetchable) [size=128M]
> Expansion ROM at <unassigned> [disabled] [size=64K]
> Capabilities: [dc] Power Management version 2
> Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> Capabilities: [80] AGP version 2.0
> Status: RQ=31 SBA- 64bit- FW- Rate=x1,x2
> Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
>
> [7.6.] SCSI information (from /proc/scsi/scsi)
> Attached devices:
> Host: scsi0 Channel: 00 Id: 00 Lun: 00
> Vendor: COMPAQ Model: DVD-ROM DRD8120B Rev: 1.10
> Type: CD-ROM ANSI SCSI revision: 02
> Host: scsi0 Channel: 00 Id: 01 Lun: 00
> Vendor: LG Model: CD-RW CED-8120B Rev: 1.09
> Type: CD-ROM ANSI SCSI revision: 02
> Host: scsi1 Channel: 00 Id: 00 Lun: 00
> Vendor: Photo Po Model: rt 7700# Rev:
> Type: Direct-Access ANSI SCSI revision: 02
> Host: scsi1 Channel: 00 Id: 00 Lun: 01
> Vendor: Photo Po Model: rt 7700# Rev:
> Type: Direct-Access ANSI SCSI revision: 02
> [7.7.] Other information that might be relevant to the problem
> (please look in /proc and include all information that you
> think to be relevant):
> [X.] Other notes, patches, fixes, workarounds:
> I'm currently getting around the problem with the following hack:
>
> diff -u arch/i386/kernel/pci-pc.orig arch/i386/kernel/pci-pc.c
> --- arch/i386/kernel/pci-pc.orig Tue Feb 26 07:12:50 2002
> +++ arch/i386/kernel/pci-pc.c Tue Feb 26 07:24:23 2002
> @@ -1144,7 +1144,7 @@
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5597, pci_fixup_latency },
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_5598, pci_fixup_latency },
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3, pci_fixup_piix4_acpi },
> - { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug },
> +/* { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8363_0, pci_fixup_via_northbridge_bug }, */
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8622, pci_fixup_via_northbridge_bug },
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8361, pci_fixup_via_northbridge_bug },
> { PCI_FIXUP_HEADER, PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8367_0, pci_fixup_via_northbridge_bug },
>
> -Tom
> --
> Tom Eastep \ Shorewall - iptables made easy
> AIM: tmeastep \ http://www.shorewall.net
> ICQ: #60745924 \ teastep@shorewall.net
> -
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