matroxfb on 2.4.0 / PCI: Failed to allocate...
Quoted 9 lines · Chad Miller
I worry about some PCI initialization output (from dmesg):
# PCI: Probing PCI hardware
# Unknown bridge resource 0: assuming transparent
# 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 [...]
Quoted 7 lines
That `device 01:00.0' is obviously the AGP MGA. 'dmesg' continues later with...
# matroxfb: Matrox Millennium G400 MAX (AGP) detected # i2c-core.o: i2c core module
# i2c-algo-bit.o: i2c bit algorithm module
# i2c-core.o: driver maven registered. [...]
What does 'lspci -v' say?
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?
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.
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...) Petr Vandrovec [email protected]
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Quoted 1 line · Petr Vandrovec
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>
#
Quoted 3 lines
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 $
Quoted 6 lines
Also, when
request_mem_region(ctrl, 16K, "matroxfb MMIO")orrequest_mem_region(videoram, 32M, "matroxfb FB")fails (f.e. when both regions are uninitialized they overlaps, so secondrequest_mem_regionfails), there is a bug that no error message is printed
in such case, as matroxfb assumes that ifrequest_mem_regionfailed, it was because of some other driver already controls this hardware.
Is there a patch available, or should I go looking for it?
Quoted 4 lines
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 <[email protected]> URL: http://web.chad.org/ (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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