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Jackson Tan
May 6th, 2012, 09:16 AM
Hi all!

I am having a problem with my RT2800 wireless on my PC in Ubuntu 11.10. Basically, there is no wireless ('sudo lshw -C network' gives '*-network UNCLAIMED'). This occurred after I've upgraded to 12.04 through Update Manager and then downgraded back to 11.10 using the Live CD (but keeping the files under /home).

The wireless card is definitely working. Previously, it worked out of the box in 11.10, and it also works in Windows 7 and the Live CD (which I'm using right now). It's only not working in my Ubuntu installation.

(On this issue of the Live CD detecting the wireless, it also correctly identified the screen resolution (1920x1080), where my Ubuntu installation shows only 1024x864. Does anyone know a fix for this?)

Is there anything I need to install? ndiswrapper doesn't seem to be installed. My issue is further compounded by the fact that the wireless is my only connection. Will a complete reinstall (including wiping out /home) solve the problem?

Jackson

praseodym
May 6th, 2012, 01:21 PM
Hi,

what card is that? Please show:


lspci -nnk | grep -iA2 net
lsmod
iwconfig
rfkill list
For the VGA card:


lspci -nnk | grep VGA
cat /etc/X11/xorg.conf
Wiping /home should never be necessary.

Jackson Tan
May 6th, 2012, 01:50 PM
Hi praseodym,

Thanks for your reply.

lspci -nnk | grep -iA2 net:


03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 06)
Subsystem: Giga-byte Technology GA-EP45-DS5 Motherboard [1458:e000]
Kernel driver in use: r8169
--
05:00.0 Network controller [0280]: Ralink corp. RT2800 802.11n PCI [1814:0601]
Subsystem: Ralink corp. Device [1814:2860]
06:00.0 USB Controller [0c03]: Etron Technology, Inc. EJ168 USB 3.0 Host Controller [1b6f:7023] (rev 01)
lsmod:


Module Size Used by
hid_logitech 26520 0
ff_memless 13097 1 hid_logitech
i915 468561 1
usbhid 47199 1 hid_logitech
drm_kms_helper 46978 1 i195
r8169 62099 0
hid 99559 2 hid_logitech,usbhid
drm 242038 2 i915,drm_kms_helper
i2c_algo_bit 13423 1 i915
video 19596 1 i915
iwconfig:


lo no wireless extensions.

etho0 no wireless extensions.
rfkill list returns nothing.

lspci -nnk | grep VGA:


01:00.0 VGA compatible controller [0300]: nVidia Corporation GF116 [GeForce GTX 550 Ti] [10de:1244] (rev a1)
cat /etc/X11/xorg.conf:

cat: /etc/X11/xorg.conf: No such file or directoryI should mention that my hard drive (ext3) does not mount automatically when I plugged it in (so I had to manually type the output). It does appear that this downgrade has scrambled certain functions that is typically considered basic.

praseodym
May 6th, 2012, 02:08 PM
For wireless:

load the driver by hand:


sudo modprobe rt2800pci

For Graphics: Install the NVIDIA driver via "additional drivers". If installed, change via CTRL+ALT+F1 to the 1st terminal and set up a xorg.conf:


sudo service gdm stop
sudo nvidia-xconfig --composite
sudo service gdm start
Change gdm to the window manager in use (e.g. lightdm, kdm, etc).

Jackson Tan
May 7th, 2012, 10:54 AM
'sudo modprobe rt2800pci' gives


FATAL: Could not load /lib/modules/3.2.0-24-generic/modules.dep: No such file or directory


Under the /lib/modules/ directory, I found only one directory: 3.0.0.12-generic. When I booted that kernel, everything returned back to normal (screen resolution, wireless). So it appears that some upgrade must have broken something.

Is there a fix for that?

kamkar1
October 7th, 2012, 06:18 AM
Recently upgraded to 11.10, and started having loading issues with firefox & chrome.
I changed the wireless setting to Automatic dhcp, and changed my router from dual mode (NG) to only (G). That seems to have fixed my problem.