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Old 08-26-2014, 07:41 PM   #1
odin_ago
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AR9485 wireless does not work


I have a problem with my wireless on a new laptop. lspci says that a wireless card is present

02:00.0 Network controller: Atheros Communications Inc. AR9485 Wireless Network Adapter (rev 01)

In dmesg I see the following:

[ 4.601265] ath9k 0000:02:00.0: can't find IRQ for PCI INT A; probably buggy MP table
[ 4.601284] ath9k 0000:02:00.0: setting latency timer to 64
[ 4.601502] ath9k 0000:02:00.0: request_irq failed
[ 4.601660] ath9k: probe of 0000:02:00.0 failed with error -16

After that, the module ath9k is present in lsmod, but there is no wireless interface in ifconfig, and the output of rfkill is empty. How do I get my wireless work?

$ uname -a
Linux asusclient 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux
 
Old 09-21-2014, 09:49 AM   #2
alxobr
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Same problem here on Asus X200MA

Hi,

I just installed Debian 7.6 on my new ASUS X200MA-CT016H and I ran in exactly the same issue: same AR9485 controller, same error messages, no wi-fi.

$> uname -a
Linux Tournesol 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3 x86_64 GNU/Linux
 
Old 09-21-2014, 04:32 PM   #3
RandomTroll
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Quote:
can't find IRQ for PCI INT A; probably buggy MP table
This error comes from the kernel's irq handler. software/kernel may be a better place to ask.

It means that the kernel can't find an irq free to assign to this device's interrupt pin. If MP table means what it used to, multiprocessor table, then it's technology that acpi replaced, and acpi has been replaced for most kernels. I suspect the error hasn't been updated. The first PC had only 8 interrupts; people sometimes had more than 8 devices that used interrupts. Now computers have many more, and no shortage.

what does
Quote:
lspci -v
return?

Last edited by RandomTroll; 09-21-2014 at 04:47 PM.
 
Old 09-21-2014, 04:52 PM   #4
ReaperX7
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Doesn't say much but this is all I could find:

http://askubuntu.com/questions/41986...n-ubuntu-13-10
 
Old 09-22-2014, 04:33 PM   #5
alxobr
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Problems stacking up...

Hi,

@ReaperX7 Thanks for the url. Iím not sure the problem is the same, since myAtheros AR9485 device never worked. Iíve seen a few other identical cases on the web, all with Asus X200MA 11.6" ultrabook (fairly common these days at least in Europe) and Debian.

@RandomTroll Everything looked normal (lspci OK and ath9k module properly loaded after request_irq failed). I canít check it anymore though since the dual boot got washed up after I made a complete reinstall with net access using a working USB WiFi key. After that the Debian installer identified my other OS (Windows 8.1) as 2 Vista instances and I ran into terrible UEFI/grub issues (GRUB: ďinvalid arch independent ELF magicĒ). I downloaded the live CD image to try to fix it along the lines of http://askubuntu.com/questions/72003...lf-magic-error and well such a drag just to get my keyboard layout, and grub-install command not found, etc, etc.. Iíve not been able to boot into the installed Debian 7.6 using the live/install CD/flashdrive like it once was possible.

Iíve been dual booting Windows/Linux for 15 years (I must still use a couple of Windows only apps for my job) but now with UEFI itís getting too much of a hassle, I just have no time for that game. I might end up using the new laptop for Windows and the old one for Linux, though such an arrangement is not ideally convenient.


Cheers, and thanks again for your help,


Alexandre
 
Old 09-24-2014, 09:42 PM   #6
ReaperX7
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What kernel version are you using?
 
Old 09-26-2014, 06:38 AM   #7
alxobr
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Hello,

$> uname -a
Linux Tournesol 3.2.0-4-amd64 #1 SMP Debian 3.2.57-3 x86_64 GNU/Linux
 
Old 09-27-2014, 10:19 AM   #8
alxobr
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System rescue on Debian is a nightmare

I am trying to rescue my system with the rescue mode of the Debian 7.6 install disk (the live CD is no better and does not start X anyway). I chose the option to enter a shell from within the install environment, with my installed (not booting) Debian root mounted on /target

Now letís have a glance at the wonders of ergonomy I am enjoying while doing this:
1. I canít set my French keyboard layout ("loadkeys fr" does not work and I canít find any fr keymap file). So I have to type virtually all the keys (including +shift and +altgrey) to find the necessary symbols like / $ * - { } (not speaking about the displaced letters).
2. The command history does not work (key up to edit/redo command). A previous command might be displayed but trying to edit it gives a terrible mess. So I have to retype each time a command fails and re-enjoy point 1.
3. The paths used in the grub-install script are hard-coded (i.e. /usr/sbin/grub-setup). So I may well set PATH=${PATH}:/target/usr/sbin, grub-install is then found but grub-setup is not.
4. My laptop does not have the page-up/page-down keys, and Fn+arrow does not work, so I have to pipe to more every command with a lengthy output, but I donít know if more will work since I still havenít found the | key on the US keyboard.

Again, this is a very popular laptop. Ainít it strange that not so many people are using Linux?


Cheers,


Alexandre
 
Old 11-26-2014, 08:05 AM   #9
alxobr
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Some hints

Hello again,

I now have a working dual boot. In case more people run into the same issues, here are some guidelines I can provide for ASUS X200MA laptops (at least X200MA-CT016H)

1. Disable Fast boot and Secure boot in the UEFI bios (F2 upon startup, with administrator rights)
2. If you canít manage to boot from your USB stick, try CSM (legacy mode) once or twice in order to oil the thing ;-) but DO NOT INSTALL UNDER CSM as Debian is UEFI compatible: ensure you are in UEFI mode before installing. You should have an UEFI partition.

See http://superuser.com/questions/71485...-debian-jessie for more details

To avoid unwanted Windows booting when the dual boot works, you should disable the Windows boot manager entry in the UEFI bios (you will boot Windows from Grub). Also it helps to set a boot password in bios to get more control.

Hope this helps,

Alexandre
 
  


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