Problems with network speed setup in F12

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Hello,
in f11 I had a line into /etc/rc.d/rc.local to force speed/duplex/autoneg:
/sbin/ethtool -s eth0 speed 100 duplex full autoneg off >> /tmp/ethtool.log 2>&1

In F12 I see that this setting is not maintained.
After I log in in Gnome I see that:
[root@tekkaman ~]# ethtool eth0
Settings for eth0:
	Supported ports: [ TP ]
	Supported link modes:   10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	Supports auto-negotiation: Yes
	Advertised link modes:  10baseT/Half 10baseT/Full
	                        100baseT/Half 100baseT/Full
	Advertised auto-negotiation: Yes
	Speed: 100Mb/s
	Duplex: Half
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: g
	Wake-on: d
	Current message level: 0x000000ff (255)
	Link detected: yes

The log file has timestamp of my boot time, so that I know it was
actually executed.
If I run it manually it succeeds and I get now:
	Advertised link modes:  Not reported
	Advertised auto-negotiation: No
	Speed: 100Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: off
	Supports Wake-on: g
	Wake-on: d
	Current message level: 0x000000ff (255)
	Link detected: yes


but after some minutes I get again:
	Advertised auto-negotiation: Yes
	Speed: 100Mb/s
	Duplex: Half
	Port: Twisted Pair
	PHYAD: 1
	Transceiver: internal
	Auto-negotiation: on
	Supports Wake-on: g
	Wake-on: d
	Current message level: 0x000000ff (255)
	Link detected: yes

So there is something external that manage this kind of changes.
Some questions:
- network guys say me that switch port is fixed at 100/full (it is a
gigabit ethernet) so, if this is true, even in autoneg there is an
error in getting settings
- what is the component that changes the settings? I walked through NM
applet to edit connections but I don't see any parameter....

Hw is a Dell laptop XPX M1330 with updated F12 x86_64
lspci for network card gives:
09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M
Fast Ethernet PCI Express (rev 02)
	Subsystem: Dell XPS M1330
	Flags: bus master, fast devsel, latency 0, IRQ 31
	Memory at f1bf0000 (64-bit, non-prefetchable) [size=64K]
	Expansion ROM at <ignored> [disabled]
	Capabilities: [48] Power Management version 3
	Capabilities: [50] Vital Product Data
	Capabilities: [58] Vendor Specific Information <?>
	Capabilities: [e8] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [d0] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [13c] Virtual Channel <?>
	Capabilities: [160] Device Serial Number 00-1d-09-ff-fe-3d-82-50
	Kernel driver in use: tg3
	Kernel modules: tg3

Strange thing is that after booting the laptop less that 4 hours ago,
with dmesg I get these messages:
tg3.c:v3.99 (April 20, 2009)
tg3 0000:09:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
tg3 0000:09:00.0: setting latency timer to 64
tg3 0000:09:00.0: PME# disabled
eth0: Tigon3 [partno(BCM95906) rev c002] (PCI Express) MAC address
00:1d:09:3d:82:50
eth0: attached PHY is 5906 (10/100Base-TX Ethernet) (WireSpeed[0])
eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[0]
eth0: dma_rwctrl[76180000] dma_mask[64-bit]
...
tg3 0000:09:00.0: PME# disabled
  alloc irq_desc for 31 on node 0
  alloc kstat_irqs on node 0
tg3 0000:09:00.0: irq 31 for MSI/MSI-X
ADDRCONF(NETDEV_UP): eth0: link is not ready
Bridge firewalling registered
virbr0: starting userspace STP failed, starting kernel STP
tg3: eth0: Link is up at 100 Mbps, full duplex.
--------------------------->>>> this I think is about my rc.local
command
tg3: eth0: Flow control is off for TX and off for RX.
ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
lo: Disabled Privacy Extensions
type=1305 audit(1264148879.894:25902): audit_enabled=0 old=1
auid=4294967295 ses=4294967295 subj=kernel res=1
eth0: no IPv6 routers present
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, full duplex.
tg3: eth0: Flow control is off for TX and off for RX.
...
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
CE: hpet increasing min_delta_ns to 22500 nsec
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.
tg3: eth0: Link is down.
tg3: eth0: Link is up at 100 Mbps, half duplex.
tg3: eth0: Flow control is off for TX and off for RX.

So I have many link down messages and (apparently) renegotiation tthat
then gives 100/half
Any suggestions???
BTW I have libvirtd started but no vm created
Thanks in advance,
Gianluca
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