Also have the problem... The reception is horrible and works fine in windows. 
from dmesg:
[  220.903488] WARNING: at 
/build/buildd/linux-3.8.0/drivers/net/wireless/ath/ath9k/hw.c:794 
ar9003_get_pll_sqsum_dvc+0xb6/0xc0 [ath9k_hw]()
[  220.903492] Hardware name: UX31E
[  220.903495] Modules linked in: usb_storage(F) ip6table_filter(F) 
ip6_tables(F) ebtable_nat(F) ebtables(F) snd_hrtimer(F) ipt_MASQUERADE(F) 
iptable_nat(F) nf_nat_ipv4(F) nf_nat(F) nf_conntrack_ipv4(F) nf_defrag_ipv4(F) 
xt_state(F) nf_conntrack(F) ipt_REJECT(F) xt_CHECKSUM(F) iptable_mangle(F) 
xt_tcpudp(F) iptable_filter(F) ip_tables(F) x_tables(F) bridge(F) stp(F) llc(F) 
joydev(F) dm_crypt(F) parport_pc(F) ppdev(F) rfcomm bnep kvm_intel kvm 
asus_nb_wmi asus_wmi sparse_keymap snd_hda_codec_hdmi snd_hda_codec_realtek 
snd_hda_intel snd_hda_codec snd_hwdep(F) rts5139(C) snd_pcm(F) 
snd_page_alloc(F) snd_seq_midi(F) snd_seq_midi_event(F) snd_rawmidi(F) 
snd_seq(F) uvcvideo videobuf2_vmalloc arc4(F) videobuf2_memops videobuf2_core 
videodev ath9k ath9k_common ath9k_hw snd_seq_device(F) snd_timer(F) ath 
mac80211 mac_hid microcode(F) snd(F) coretemp cfg80211 ath3k mei btusb 
soundcore(F) lp(F) parport(F) bluetooth psmouse(F) serio_raw(F) lpc_ich 
ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) xts(F) lrw(F) gf128mul(F) 
ablk_helper(F) cryptd(F) wmi i915 video(F) i2c_algo_bit drm_kms_helper ahci(F) 
libahci(F) drm
[  220.903633] Pid: 214, comm: kworker/u:5 Tainted: GF        C   
3.8.0-21-generic #32-Ubuntu
[  220.903637] Call Trace:
[  220.903650]  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
[  220.903658]  [<ffffffff8105884a>] warn_slowpath_null+0x1a/0x20
[  220.903676]  [<ffffffffa038e9a6>] ar9003_get_pll_sqsum_dvc+0xb6/0xc0 
[ath9k_hw]
[  220.903693]  [<ffffffffa03fe2e3>] ath_hw_pll_work+0x53/0xd0 [ath9k]
[  220.903702]  [<ffffffff8107676c>] process_one_work+0x15c/0x4d0
[  220.903710]  [<ffffffff81077fce>] worker_thread+0x16e/0x480
[  220.903718]  [<ffffffff81077e60>] ? manage_workers+0x2a0/0x2a0
[  220.903725]  [<ffffffff8107d300>] kthread+0xc0/0xd0
[  220.903732]  [<ffffffff8107d240>] ? kthread_create_on_node+0x120/0x120
[  220.903742]  [<ffffffff816d372c>] ret_from_fork+0x7c/0xb0
[  220.903748]  [<ffffffff8107d240>] ? kthread_create_on_node+0x120/0x120
[  220.903753] ---[ end trace 7faecf033a2db336 ]---
[  220.903758] ath: phy0: PLL4 meaurement not done
[  221.015326] ath: phy0: PLL4 meaurement not done
[  221.127122] ath: phy0: PLL4 meaurement not done
[  221.239037] ath: phy0: PLL4 meaurement not done
[  221.350902] ath: phy0: PLL4 meaurement not done

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https://bugs.launchpad.net/bugs/1160188

Title:
  ATH9K wireless signal weak

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