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Subjectmatroxfb and 2.6.0-test2
The card is a Matrox Millenium G400 M4A32DG (single head).

2.6.0-test2 is the first 2.5.x I try, so I may be missing
something.

During make modules_install I noticed the following warning
(yes, I installed the latest module-init-tools):

if [ -r System.map ]; then /sbin/depmod -ae -F System.map 2.6.0-test2; fi
WARNING: /lib/modules/2.6.0-test2/kernel/drivers/video/matrox/matroxfb_crtc2.ko
needs unknown symbol matroxfb_enable_irq

I don't know if it's serious but then I rebooted from 2.4.21.

My init script contains

if lspci | grep -q 'MGA G400'; then
modprobe matroxfb_base
fi

and /etc/modprobe.conf options matroxfb_base vesa=440

After it the screen became corrupted with a dump of my last
shutdown. All commands still worked. I don't use fbset at all.
The logs don't have anything about matroxfb.

With 2.4.21 I get

Jul 28 19:55:14 pervalidus kernel: matroxfb: Matrox G400 (AGP) detected
Jul 28 19:55:14 pervalidus kernel: matroxfb: MTRR's turned on
Jul 28 19:55:14 pervalidus kernel: matroxfb: 1024x768x24bpp (virtual: 1024x5460)
Jul 28 19:55:14 pervalidus kernel: matroxfb: framebuffer at 0xD8000000, mapped to 0xe0866000, size 33554432
Jul 28 19:55:14 pervalidus kernel: Console: switching to colour frame buffer device 128x48
Jul 28 19:55:14 pervalidus kernel: fb0: MATROX VGA frame buffer device

My .config and dmesg are at
http://www.pervalidus.net/tmp/.config-2.6.0-test2.txt
http://www.pervalidus.net/tmp/dmesg-2.6.0-test2.txt
http://www.pervalidus.net/tmp/dmesg-2.6.0-acpi=off+noapic-test2.txt

lspci -vvv returns

01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 04) (prog-if 00 [VGA])
Subsystem: Matrox Graphics, Inc. Millennium G400 32Mb SDRAM
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 (4000ns min, 8000ns max), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at d8000000 (32-bit, prefetchable) [size=32M]
Region 1: Memory at da000000 (32-bit, non-prefetchable) [size=16K]
Region 2: Memory at db000000 (32-bit, non-prefetchable) [size=8M]
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: [f0] 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=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x1
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