ac100 team mailing list archive

[Luka <lblasc@xxxxxxxxx>]

On 22.10.2011 12:34, Joachim Fahrner wrote:
> Am 22.10.2011 12:03, schrieb Christian Lins:
> > I have trouble with wifi on the AC100 10V, too. After connecting to 
> > an AP it works for a few seconds and then stalls. Sometimes it is 
> > working again after a minute or so.
>
> That's exactly what my AC100 behaves.
>
> In this state it is absolutely unusable. Now I have a problem: I have
> 2 weeks for returning it to my dealer and get my money back. I would
> keep it if I know that this bug is confirmed and a solution is
> available in the near future, because the AC100 is a very nice 
> device.
> But if this bug is denied by the developers and no solution is in
> sight in the near future, then I have to give it back to my dealer.

Have you tried Henning Heinold method ?

> I have sometimes problems too and solving them with the 
> "hardwaretrick",
>
> which means pressing left of the micro-holes on the frame of the 
> display.

Its strange but it worked for me. But after half an hour connection 
became unstable. My model is AC100 10V using latest marvin24 kernel on 
debian armhf.

In dmesg I constantly get (connection is stable):

[ 7140.631127] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 5
[ 7140.634491] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 6
[ 7140.637097] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 8
[ 7140.637490] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 10
[ 7140.637862] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 11
[ 7140.638453] phy0 -> rt2800usb_txdone_entry_check: Warning - TX 
status report missed for queue 2 entry 14
....

Connection become unstable:

[ 7241.969065] kworker/u:1: page allocation failure. order:1, 
mode:0x4020
[ 7241.969078] Backtrace:
[ 7241.969114] [<c003a418>] (unwind_backtrace+0x0/0xe4) from 
[<c00d9bfc>] (__alloc_pages_nodemask+0x650/0x72c)
[ 7241.969137] [<c00d9bfc>] (__alloc_pages_nodemask+0x650/0x72c) from 
[<c01041b8>] (new_slab+0x6c/0x1c8)
[ 7241.969155] [<c01041b8>] (new_slab+0x6c/0x1c8) from [<c010481c>] 
(__slab_alloc.clone.51+0x150/0x2c0)
[ 7241.969171] [<c010481c>] (__slab_alloc.clone.51+0x150/0x2c0) from 
[<c01060a4>] (__kmalloc_track_caller+0xc0/0x160)
[ 7241.969190] [<c01060a4>] (__kmalloc_track_caller+0xc0/0x160) from 
[<c028e564>] (__alloc_skb+0x50/0xe0)
[ 7241.969207] [<c028e564>] (__alloc_skb+0x50/0xe0) from [<c028eb5c>] 
(dev_alloc_skb+0x18/0x3c)
[ 7241.969243] [<c028eb5c>] (dev_alloc_skb+0x18/0x3c) from [<bf2cb000>] 
(rt2x00queue_alloc_rxskb+0x40/0xb8 [rt2x00lib])
[ 7241.969276] [<bf2cb000>] (rt2x00queue_alloc_rxskb+0x40/0xb8 
[rt2x00lib]) from [<bf2c86b4>] (rt2x00lib_rxdone+0x3c/0x4a8 [rt2x00lib])
[ 7241.969304] [<bf2c86b4>] (rt2x00lib_rxdone+0x3c/0x4a8 [rt2x00lib]) 
from [<bf2d9398>] (rt2x00usb_work_rxdone+0x54/0x6c [rt2x00usb])
[ 7241.969328] [<bf2d9398>] (rt2x00usb_work_rxdone+0x54/0x6c 
[rt2x00usb]) from [<c007bf20>] (process_one_work+0x244/0x3bc)
[ 7241.969346] [<c007bf20>] (process_one_work+0x244/0x3bc) from 
[<c007e030>] (worker_thread+0x1cc/0x2d4)
[ 7241.969364] [<c007e030>] (worker_thread+0x1cc/0x2d4) from 
[<c00816d4>] (kthread+0x80/0x88)
[ 7241.969385] [<c00816d4>] (kthread+0x80/0x88) from [<c00345c4>] 
(kernel_thread_exit+0x0/0x8)
[ 7241.969394] Mem-info:
[ 7241.969400] Normal per-cpu:
[ 7241.969407] CPU    0: hi:  186, btch:  31 usd:  33
[ 7241.969415] CPU    1: hi:  186, btch:  31 usd: 148
[ 7241.969432] active_anon:17174 inactive_anon:23662 isolated_anon:0
[ 7241.969436]  active_file:22085 inactive_file:36319 isolated_file:0
[ 7241.969440]  unevictable:700 dirty:5000 writeback:1761 unstable:0
[ 7241.969444]  free:1950 slab_reclaimable:4852 slab_unreclaimable:1922
[ 7241.969448]  mapped:6322 shmem:867 pagetables:829 bounce:0
[ 7241.969473] Normal free:7800kB min:2696kB low:3368kB high:4044kB 
active_anon:68696kB inactive_anon:94648kB active_file:88340kB 
inactive_file:145276kB unevictable:2800kB isolated(anon):0kB 
isolated(file):0kB present:455168kB mlocked:2800kB dirty:20000kB 
writeback:7044kB mapped:25288kB shmem:3468kB slab_reclaimable:19408kB 
slab_unreclaimable:7688kB kernel_stack:1840kB pagetables:3316kB 
unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:114 
all_unreclaimable? no
[ 7241.969498] lowmem_reserve[]: 0 0
[ 7241.969507] Normal: 1908*4kB 1*8kB 2*16kB 2*32kB 1*64kB 0*128kB 
0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 7800kB
[ 7241.969539] 59919 total pagecache pages
[ 7241.969545] 186 pages in swap cache
[ 7241.969552] Swap cache stats: add 2796, delete 2610, find 10/36
[ 7241.969559] Free swap  = 251876kB
[ 7241.969564] Total swap = 262136kB
[ 7241.977072] 114688 pages of RAM
[ 7241.977084] 3686 free pages
[ 7241.977089] 2272 reserved pages
[ 7241.977094] 4694 slab pages
[ 7241.977099] 74407 pages shared
[ 7241.977104] 186 pages swap cached
[ 7241.977114] SLUB: Unable to allocate memory on node -1 (gfp=0x20)
[ 7241.977125]   cache: kmalloc-8192, object size: 8192, buffer size: 
8192, default order: 3, min order: 1
[ 7241.977136]   node 0: slabs: 35, objs: 140, free: 0


I've applied those patches: (on latest marvin24 kernel)
rt2x00: fix crash in rt2800usb_write_tx_desc - 
http://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=4b1bfb7d2d125af6653d6c2305356b2677f79dc6
rt2x00: fix crash in rt2800usb_get_txwi - 
http://git.kernel.org/?p=linux/kernel/git/linville/wireless-testing.git;a=commit;h=674db1344443204b6ce3293f2df8fd1b7665deea

Kernel is still compiling on ac100, didn't tested it yet.