[SOLVED] X segfaults and unable to log in (when keyboard is absent)

kaz2100 · 04-23-2015, 02:04 AM

Hya,

I ran into a little bit weird situation.

Situation
I replaced legacy port keyboard with USB port keyboard.
On my console, things look good. X can be invoked then choked. (screen lock up, dead keyboard, mouse pointer moves but unable to click anything)

I tried to recover through ssh log in. It connects (I see login prompt, I can type in password, but unable to log in - waiting forever)

System
Debian jessie, amd64, custom kernel.
USB driver is is xhci (USB 3.0)

X.Org X Server 1.16.4
Release Date: 2014-12-20

Troubleshoot
Xorg.0.log looks like

Code:

.
[  1419.854] (WW) xf86CloseConsole: VT_GETMODE failed: Input/output error
[  1419.854] (EE) 
Fatal server error:
[  1419.854] (EE) xf86CloseConsole: VT_ACTIVATE failed: Input/output error
[  1419.854] (EE) 
[  1419.854] (EE) 
Please consult the The X.Org Foundation support 
         at http://wiki.x.org
 for help. 
[  1419.854] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[  1419.854] (EE) 
[  1419.854] (EE) 
[  1419.854] (EE) Backtrace:
[  1419.855] (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7f62b0330d46]
[  1419.855] (EE) 1: /usr/bin/X (0x7f62b017a000+0x1baf29) [0x7f62b0334f29]
[  1419.855] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f62ade6e000+0x35180) [0x7f62adea3180]
[  1419.855] (EE) 
[  1419.855] (EE) Segmentation fault at address 0x0
[  1419.855] (EE) 
FatalError re-entered, aborting
[  1419.855] (EE) Caught signal 11 (Segmentation fault). Server aborting
[  1419.855] (EE)

Putting keyboard back into legacy port resolved this situation.

Keyboard itself works via USB on other computers, even on the console of this computer.
I do not have xorg.conf

I have not spent time for further troubleshooting yet. For the time being, it is ok for me to survive. I am posting here because segfault is not a good thing to show up under such condition, I guess.

Have a nice day!

I will update.

cheers

veerain · 04-23-2015, 05:48 AM

Do you have /etc/X11/xorg.conf?

Perhaps it has set ps/2 mouse as default.

Try starting X without a config file and see, by just renaming the xorg.conf file to something else.

kaz2100 · 04-23-2015, 06:49 AM

Thanks for your comment.

No, I do not have xorg.conf (under /etc/X11)

cheers

veerain · 04-23-2015, 09:42 AM

Sometimes GPM interferes with X Window system. Try stopping it before starting X.

kaz2100 · 04-23-2015, 09:08 PM

Hya

Thanks for your comment.

I don't think I have gpm installed.

I have libgpm2, on which many applications depend.

cheers.

kaz2100 · 03-20-2016, 03:53 AM

Hya

After a long interval, (also system update to stretch), the problem is gone.

cheers