Problem with X starting when certain USB configurations exist

russell.poffenberger at russell.poffenberger at
Tue Feb 23 21:12:48 UTC 2016


I am having a problem with a Centos 6.7 installation with  the latest 
patches (2.6.32-573.18.1.el6.x86_64). The X server  version is 
The motherboard is a SuperMicro X11SSV-Q. This is an i7-6700 CPU and Q170 
It has a built-in intel graphics chip.

The system works fine, until I plug in some combinations of USB hubs. For 
example, I have an 8 port USB 3.0 hub (based on the VIA chip), but also 
some combinations of USB 2.0 hubs also cause the problem. A single 
Terminus USB 2.0 7 port hub by itself is fine, but adding a second hub 
does not work.

What happens is that the X server will not start. The relevant lines from 
the X log appears to be..

[   561.239] (II) Loading /usr/lib64/xorg/modules/
[   561.240] (II) Module int10: vendor="X.Org Foundation"
[   561.240]    compiled for 1.15.0, module version = 1.0.0
[   561.240]    ABI class: X.Org Video Driver, version 15.0
[   561.240] (II) VESA(0): initializing int10
[   561.240] (EE) VESA(0): V_BIOS address 0x367f0 out of range
[   561.240] (II) UnloadModule: "vesa"
[   561.240] (II) UnloadSubModule: "int10"
[   561.240] (II) Unloading int10
[   561.240] (II) UnloadSubModule: "vbe"
[   561.240] (II) Unloading vbe
[   561.240] (EE) Screen(s) found, but none have a usable configuration.
[   561.240] (EE) 
Fatal server error:
[   561.240] (EE) no screens found(EE) 
[   561.240] (EE) 
Please consult the CentOS support 
 for help. 
[   561.240] (EE) Please also check the log file at "/var/log/Xorg.5.log" 
for additional information.
[   561.240] (EE) 
[   561.241] (EE) Server terminated with error (1). Closing log file.

It is the V_BIOS address out of range that appears to be the problem.
When I don't have the problem USB hubs installed, then the same section of 
the log file is fine..

[    11.385] (II) Loading /usr/lib64/xorg/modules/
[    11.385] (II) Module int10: vendor="X.Org Foundation"
[    11.385]    compiled for 1.15.0, module version = 1.0.0
[    11.385]    ABI class: X.Org Video Driver, version 15.0
[    11.385] (II) VESA(0): initializing int10
[    11.385] (II) VESA(0): Primary V_BIOS segment is: 0xc000
[    11.387] (II) VESA(0): VESA BIOS detected
[    11.387] (II) VESA(0): VESA VBE Version 3.0
[    11.387] (II) VESA(0): VESA VBE Total Mem: 32704 kB
[    11.387] (II) VESA(0): VESA VBE OEM: Intel(R) SKL Mobile/Desktop 
Graphics Chipset Accelerated VGA BIOS
[    11.387] (II) VESA(0): VESA VBE OEM Software Rev: 0.0
[    11.421] (II) VESA(0): Creating default Display subsection in Screen 
        "Default Screen Section" for depth/fbbpp 24/32

This happens whether the hubs are active at boot time (in which case the X 
server never starts), or if I plug the hub after booting, in which case if 
I log off, then the X server does not restart.

Any help would be greatly appreciated.


Russ Poffenberger | System Architecture Group
Phone:  +1 / 408 / 635-6049
russell.poffenberger at
Xcerra Corporation, LTX/Credence Division
1355 California Circle
Milpitas, CA 95035, USA
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