Miroslav Geisselreiter wrote: > Dne 17.9.2019 v 14:02 Mauricio Tavares napsal(a): > >> On Tue, Sep 17, 2019 at 7:06 AM Miroslav Geisselreiter <mg at intar.cz> >> wrote: >> >>> I have brand new PC with this components: >>> CPU Intel® Pentium G5400, LGA1151 >>> motherboard ASUS PRIME B360M-C 16 GB RAM >>> HDD 2x ADATA SSD 256GB XPG GAMMIX S11, PCIe Gen3x4 M.2 2280 (RAID1) >>> NIC Intel X550-T1 Ethernet Converged Network Adapter >>> >>> I installed CentOS 7 and two NICs were detected: >>> eno1 (on motherboard) enp1s0 (Intel X550-T1) >>> >>> When I restart the machine sometimes enp1s0 is missing. It is not >>> detected during boot. It looks like NIC card is not installed / not >>> present. After next reboot everything is fine and I do not see any >>> problems with NIC card. >>> >>> How can I avoid this problem with missing NIC? Can you help me, >>> please? >>> >> Nothing exciting on dmesg? Did you check the pci chain to see if >> it is being reported as there? >> <snip> Have you done lspci when it happens, and compared to when it's working? I almost wonder if it's either a hardware error, or something in the BIOS. Have you tried opening up the box and reseating the card? mark