Asus p5dl2 - No Gigabit

[usja]

Good evening.
I have problems with my motherboard network adapter.
Mother board: Asus p5dl2

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02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 19)
	Subsystem: ASUSTeK Computer Inc. Marvell 88E8053 Gigabit Ethernet controller PCIe (Asus)
	Flags: bus master, fast devsel, latency 0, IRQ 26
	Memory at cdefc000 (64-bit, non-prefetchable) [size=16K]
	I/O ports at c800 [size=256]
	Expansion ROM at cdec0000 [disabled] [size=128K]
	Capabilities: [48] Power Management version 2
	Capabilities: [50] Vital Product Data
	Capabilities: [5c] MSI: Enable+ Count=1/2 Maskable- 64bit+
	Capabilities: [e0] Express Legacy Endpoint, MSI 00
	Kernel driver in use: sky2
	Kernel modules: sk98lin, sky2

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02:00.0 "Ethernet controller" "Marvell Technology Group Ltd." "88E8053 PCI-E Gigabit Ethernet Controller" -r19 "ASUSTeK Computer Inc." "Marvell 88E8053 Gigabit Ethernet controller PCIe (Asus)"

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[root@server ~]# /sbin/lsmod | egrep 'sky2|sk98lin'
sk98lin               187512  0 
sky2                   48192  0 

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# ethtool eth0
Settings for eth0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Supported pause frame use: No
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full 
	                        100baseT/Half 100baseT/Full 
	                        1000baseT/Half 1000baseT/Full 
	Advertised pause frame use: No
	Advertised auto-negotiation: Yes
	Speed: 100Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 0
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: pg
	Wake-on: d
	Current message level: 0x000000ff (255)
			       drv probe link timer ifdown ifup rx_err tx_err
	Link detected: yes

i've tried:

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ethtool -s eth0 speed 1000

but after that, ssh connection was lost and server wasn't connect to lan. Only hard reboot.

Help me please

[usja]

i've found one thing: when i connect cable from cisco router – i can force gigabit by ethtool, but when i connect to switch d-link dgs-1005A (which support gigabit) i get only 100

Also, i've tested cable (6 cat.). It's ok. When i connect two ports with it on switch - switch shows 1Gb connection