[Bluez-users] bthid and console switching

[Bluez-users] bthid and console switching

[Jeffrey Arbuckle]

I'm using the cvs bthid with kernel 2.6 with
Microsoft's Bluetooth desktop.

Everything is working great except when using the bluetooth
keyboard to switch to console with CNTL-ALT-F[1-6] from xwindows.

Doing so causes bthid to crash.  Syslog reveals:

Unable to handle kernel paging request at virtual address 00100100
 printing eip:
 c024b1ee
 *pde = 00000000
 Oops: 0000 [#1]
 CPU:    0
 EIP:    0060:[<c024b1ee>]    Tainted: P  
 EFLAGS: 00010246
 EIP is at mousedev_event+0x80/0x1fc
 eax: 00100100   ebx: 001000f8   ecx: 00100100   edx: f7264000
 esi: c03ae3a0   edi: 00000000   ebp: f7265efc   esp: f7265ed4
 ds: 007b   es: 007b   ss: 0068
 Process bthid (pid: 902, threadinfo=f7264000 task=f7269310)
 Stack: f7d26900 0000001d 00020001 0000001e 00000001 f7272a00 c03ae3a0 00000000 
        f7265f00 f7272a00 c03ae3a0 00000000 00000000 f7272a34 f723ce38 00000000 
        00000000 c024976b f7272a34 00000000 00000000 00000000 00000000 00000000 
 Call Trace:
  [<c024976b>] input_event+0xef/0x3fa
  [<f8830541>] uinput_write+0xa9/0xd2 [uinput]
  [<c015beee>] vfs_write+0xbc/0x127
  [<c015bffe>] sys_write+0x42/0x63
  [<c010953b>] syscall_call+0x7/0xb

Code: 8b 53 08 89 d1 0f 18 02 90 8d 56 2c 39 d0 75 cf 8b 44 24 10 

Note that when using a ps/2 keyboard and the bluetooth keyboard, the
ps/2 keyboard will not cause bthid to crash when switching consoles, but the
bluetooth keyboard will.

After bthid crashes and the machine is in console, no input from the ps/2
keyboard appears on the screen.  However, CNTL-ALT-F7 returns the machine
to xwindows where input from the ps/2 allows bthid to be run again.
Bluetooth keyboard and mouse then work as normal but switching consoles
repeats the cyle all over again.

Any ideas?

-jeff



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Re: [Bluez-users] bthid and console switching

[Marcel Holtmann]

Hi Jeffrey,

> I'm using the cvs bthid with kernel 2.6 with
> Microsoft's Bluetooth desktop.
> 
> Everything is working great except when using the bluetooth
> keyboard to switch to console with CNTL-ALT-F[1-6] from xwindows.
> 
> Doing so causes bthid to crash.  Syslog reveals:
> 
> Unable to handle kernel paging request at virtual address 00100100
>  printing eip:
>  c024b1ee
>  *pde = 00000000
>  Oops: 0000 [#1]
>  CPU:    0
>  EIP:    0060:[<c024b1ee>]    Tainted: P  
>  EFLAGS: 00010246
>  EIP is at mousedev_event+0x80/0x1fc
>  eax: 00100100   ebx: 001000f8   ecx: 00100100   edx: f7264000
>  esi: c03ae3a0   edi: 00000000   ebp: f7265efc   esp: f7265ed4
>  ds: 007b   es: 007b   ss: 0068
>  Process bthid (pid: 902, threadinfo=f7264000 task=f7269310)
>  Stack: f7d26900 0000001d 00020001 0000001e 00000001 f7272a00 c03ae3a0 00000000 
>         f7265f00 f7272a00 c03ae3a0 00000000 00000000 f7272a34 f723ce38 00000000 
>         00000000 c024976b f7272a34 00000000 00000000 00000000 00000000 00000000 
>  Call Trace:
>   [<c024976b>] input_event+0xef/0x3fa
>   [<f8830541>] uinput_write+0xa9/0xd2 [uinput]
>   [<c015beee>] vfs_write+0xbc/0x127
>   [<c015bffe>] sys_write+0x42/0x63
>   [<c010953b>] syscall_call+0x7/0xb
> 
> Code: 8b 53 08 89 d1 0f 18 02 90 8d 56 2c 39 d0 75 cf 8b 44 24 10 
> 
> Note that when using a ps/2 keyboard and the bluetooth keyboard, the
> ps/2 keyboard will not cause bthid to crash when switching consoles, but the
> bluetooth keyboard will.
> 
> After bthid crashes and the machine is in console, no input from the ps/2
> keyboard appears on the screen.  However, CNTL-ALT-F7 returns the machine
> to xwindows where input from the ps/2 allows bthid to be run again.
> Bluetooth keyboard and mouse then work as normal but switching consoles
> repeats the cyle all over again.

I have no idea why this happens. Please run ksymoops on the oops. Do you
use a SMP or preempt kernel? Do it also fail if you don't connect the
mouse?

Regards

Marcel




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