Sleep and an Ethernet connection

[Tommy Trussell]

On Sat, Mar 28, 2015 at 12:01 AM, Phil <phil_lor at bigpond.com> wrote:

> One annoying problem that I've yet to resolve is the dropping of the
> Ethernet connection after waking from sleep. I occasionally had the same
> problem with a wireless connection on my laptop but that was easily
> overcome by pressing the "connect" button. There isn't a "connect" button
> in the "Active connections" box after waking on the desktop computer. The
> "Active connections" box is blank until the computer is rebooted.


It may be an issue particular to your laptop. The first thing I would
suggest is to check to see if you have the latest BIOS on the laptop, AND
whether the settings are appropriate to the way you are using it. For
example, there may be a "Wake on LAN setting" or a "Power Saving" setting
in your BIOS that specifically determines how the system handles the power
on your ethernet port.

Another thing to determine is whether there's an unusual driver or a
setting for your ethernet port that may have better performance for what
you're trying to do.

FOR EXAMPLE: On my laptop, I can issue a lspci command in a terminal and
see that the ethernet port is "03:00.0 Ethernet controller: Realtek
Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet
Controller (rev 10)." I grep'ed through dmesg and found the r8169 module is
getting loaded to activate that port. modinfo reports that is the "RealTek
RTL-8169 Gigabit Ethernet driver," and it's also dependent on the mii
module, which is the "MII hardware support library."

IF I were experiencing the issue you have described (I might or might not;
I haven't tried it) I would then start doing some Internet searches looking
for reports of issues with the driver your laptop uses in Ubuntu. There may
be a workaround involving a BIOS setting or a parameter you can pass to the
module.

REMEMBER your hardware very likely is different -- I was giving details
about my specific laptop (a Lenovo E540) as an example. You can start by
searching for [your laptop's model name] ubuntu ethernet.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/ubuntu-users/attachments/20150328/9913045b/attachment.html>