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The internet keeps cutting out every several minutes, sometimes it lasts longer but it happens eventually. I can still use the internet if I disconnect from the menu and click connect again. Any help would be appreciated :)
Details of my Wireless Card:
Wireless card: 04:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8187SE Wireless LAN Controller (rev 22)
I'm just running a plain old fully up to date 64-bit Ubuntu (Kernel 2.6.38-10-generic)
How the kernel recognises my wireless card:
I'm just using standard network manager, not customised anything really..
Jorge Castro2 Answers
Dropped WiFi connections can either be environmental or software related.
I'll try to keep this as generic as possible, so that the answer could apply to any WiFi cards.
Three environmental areas that you should consider before delving into the software suggestions below:
WIFI Encryption - Try changing the encryption method on your WIFI router, see if that results in a more stable connection.
WIFI Router itself - Try moving to a new access point, do you still have connectivity issues?
WIFI Channel - Try changing the channel your router is communicating on. In your area, there may be too much traffic on the channel you selected.
Once you've ruled these areas out, five software possible avenues you could consider:
- Looking to see if any WiFi Backport exist and if so, installing the appropriate package
- See if this is a 64bit vs 32bit issue
- Trying a newer Kernel, either the next available stable kernel OR testing the very latest alpha/beta Ubuntu version which contains the latest release candidate kernel
- Disabling the power management of your wireless card
- (the choice of very last resort) using NDISWrapper
Backports
The kernel developers often release a software package containing updates for WiFi devices derived from the latest or most recent kernel.
For Natty, this package is called linux-backports-modules-cw-2.6.39-generic (thanks Jorge). This package can be found either in the proposed repository or in the backport repository. Tick the appropriate checkbox in Software Sources and Reload the latest updates.
Open either Software Center or Synaptic Manager and search for the package named (or similarly named) as above. If the package is available, install the package, reboot and see if the WiFi connection is more stable.
64bit vs 32bit
As linux matures, 64bit vs 32bits issues should reduce. However it is not unknown that a 64bit installation can be more unstable compared to a 32bit installation - and visa-versa.
For your card, I found a bug report for your Wireless card here that describes your symptoms - 64bit kernel, wifi drops connection randomly.
Take a backup of your system first using, for example, Clonezilla, so that you have something you can easily restore from.
Try installing the 32bit version of Natty. See if your connection is more stable. You could also test the other suggestions in this answer in this 32bit configuration.
Newer Kernel
Testing a newer Kernel can sometimes cause instability issues - for example boot and black-screen issues. I would recommend you remove any Additional Hardware graphic drivers (e.g. ATI or Nvidia) first. I also recommend that you have a good backup for example, using CloneZilla which you can restore from.
Look for the next stable mainline kernel from here on LaunchPad.
Looking at the change lists on kernel 2.6.39, it does mention some updates for your card.
You can install the 2.6.39 kernel as described in my answer here.
Rtl8187se Wireless Lan Controller
Disabling Power Management
Sometimes wireless cards can have Power Management modes. Its not unknown for these modes to be buggy in linux. Switching off power-management can sometimes help.
You may have to do some Google research to see if there is a specific method to disable Power Managment. Below is a method I've used in the past for some cards.
From a terminal type:
If the file opened contains any statements then add the following line (if it doesnt already exist)
If the file opened is empty then add the following
Now copy and paste the following:
Then reboot.
NDISWrapper
Wireless Lan Controller Software
Note - NDISWrapper can cause black-screen issues on boot - so have a good backup for example, using CloneZilla which you can restore from.
NDISWrapper was at one time a few years ago, one frequently used method for wireless cards because the kernel had so few wireless driver support.
Its fallen out of favour in recent times for many reasons that I wont go into...
To be honest, RTL8187se has been in the kernel for some time so the following suggestion should be considered as a last resort.
Search for ndisgtk in the software center and install
Now download the windows xp drivers, in your case from Realtek
Extract from the zip file.
Using ndisgtk - navigate to the folder - RTL8187SE - WinXP and point ndisgtk to the .inf file. Hopefully now (maybe after a reboot) network manager should use this driver in preference to the RTL8187SE kernel driver - n.b. hopefully you dont have to blacklist the kernel.
It sounds similar to an issue as I used to get in Meego (no not Ubuntu) where the wifi used to cut in and out so much so it was a real pain.
I remember at the time that it was fixed by editing the rc.local file with a really easy fix which worked (albeit in Meego) but
gksudo gedit rc.local
Insert the following lines if they are not already there (or uncomment them)
(originally in the older meego bug we used to have to change wlan0 to eth1 (dont know why but it used to mean us using eth1 not wlan0 )
BUT this was a broadcom issue however it seemed a little similar to what you were describing