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SubjectRe: matroxfb on 2.4.0 / PCI: Failed to allocate...
On Tue, Jan 16, 2001 at 05:56:34PM +0000, Petr Vandrovec wrote:
> What does 'lspci -v' say?

Hi, Petr.

I'm sorry for the verbosity, all. Here it is:

#00:00.0 Host bridge: VIA Technologies, Inc. VT8371 [KX133] (rev 02)
# Flags: bus master, medium devsel, latency 0
# Memory at d0000000 (32-bit, prefetchable) [size=64M]
# Capabilities: <available only to root>
#00:01.0 PCI bridge: VIA Technologies, Inc. VT8371 [KX133 AGP] (prog-if 00 \
#[Normal decode])
# Flags: bus master, 66Mhz, medium devsel, latency 0
# Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
# Memory behind bridge: d4000000-d6ffffff
# Prefetchable memory behind bridge: d7000000-d8ffffff
# Capabilities: <available only to root>
#00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] \
#(rev 22)
# Subsystem: VIA Technologies, Inc. VT82C686/A PCI to ISA Bridge
# Flags: bus master, stepping, medium devsel, latency 0
#00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 10) \
#(prog-if 8a [Master SecP PriP])
# Flags: bus master, medium devsel, latency 32
# I/O ports at e000 [size=16]
# Capabilities: <available only to root>
#00:07.4 Host bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] \
#(rev 30)
# Flags: medium devsel
# Capabilities: <available only to root>
#00:09.0 Ethernet controller: Intel Corporation 82557 [Ethernet Pro 100] \
#(rev 08)
# Subsystem: Intel Corporation EtherExpress PRO/100+ Management Adapter
# Flags: bus master, medium devsel, latency 32, IRQ 11
# Memory at da100000 (32-bit, non-prefetchable) [size=4K]
# I/O ports at ec00 [size=64]
# Memory at da000000 (32-bit, non-prefetchable) [size=1M]
# Expansion ROM at <unassigned> [disabled] [size=1M]
# Capabilities: <available only to root>
#01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP \
#(rev 05) (prog-if 00 [VGA])
# Subsystem: Matrox Graphics, Inc. Millennium G400 MAX/Dual Head 32Mb
# Flags: bus master, VGA palette snoop, medium devsel, latency 64, IRQ 10
# Memory at d8000000 (32-bit, prefetchable) [size=16M]
# Memory at d4000000 (32-bit, non-prefetchable) [size=16K]
# Memory at d5000000 (32-bit, non-prefetchable) [size=8M]
# Expansion ROM at <unassigned> [disabled] [size=64K]
# Capabilities: <available only to root>

> Are you sure that you do not have 'matroxfb: control registers are not
> available, matroxfb disabled', or 'matroxfb: video RAM is not available
> in PCI address space, matroxfb disabled' messages?

$ dmesg |egrep -i '(pci|matrox|mga|fb|registers|video)' | \
egrep -v '(IDE|passed|Serial)'
Kernel command line: mem=262080K root=/dev/hda3 video=matrox
PCI: PCI BIOS revision 2.10 entry at 0xfb4d0, last bus=1
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: Using IRQ router VIA [1106/0686] at 00:07.0
PCI: Cannot allocate resource region 0 of device 01:00.0
PCI: Failed to allocate resource 0 for Matrox Graphics, Inc. MGA G400 AGP
matroxfb: Matrox Millennium G400 MAX (AGP) detected
PCI: Found IRQ 11 for device 00:09.0

> Also, when request_mem_region(ctrl, 16K, "matroxfb MMIO") or
> request_mem_region(videoram, 32M, "matroxfb FB") fails (f.e. when
> both regions are uninitialized they overlaps, so second request_mem_region
> fails), there is a bug that no error message is printed
> in such case, as matroxfb assumes that if request_mem_region failed,
> it was because of some other driver already controls this hardware.

Is there a patch available, or should I go looking for it?

> You should make sure that (1) you have only one VGA in machine and
> (2) your BIOS is not buggy. Changing any of these two conditions should
> enable matroxfb to run (G400 is not very well supported as second head;
> you can experiment with 'memtype' matroxfb option, but...)

(1) is true. (2) is true, AFAICT, but I'm no BIOS expert. I once success-
fully used matroxfb on this machine under 2.2.~17, but haven't tried it
again before 2.4 .

- chad

Chad Miller <> URL: (GPG)
"Any technology distinguishable from magic is insufficiently advanced".
First corollary to Clarke's Third Law (Jargon File, v4.2.0, 'magic')
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