Modell: Satellite Pro C850-1L2(Modell-ID: 1175)
Just for your information, Debian 7.1.0 during installation says that computer needs rtl_mic/rtl8168e3.fw, which is in their non-free repository.
http://packages.debian.org/wheezy/firmware-realtek
At any case, wired connection works perfectly with Trisquel. This is the ethernet entry from lspci
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 07)
| 3G cards | 34 |
| Acquisition cards | 34 |
| Bluetooth | 58 |
| Ethernet cards | 173 |
| Fingerprint readers | 11 |
| Host Controllers | 171 |
| Modems | 18 |
| Notebooks | 800 |
| Printers | 127 |
| RAID adapters | 20 |
| Scanners | 24 |
| SD card readers | 57 |
| Sound cards | 145 |
| Video cards | 346 |
| Webcams | 133 |
| Wifi cards | 234 |
| TOTAL | 2385 |