Public bug reported:
This is one of those things where, in retrospect, I wonder why it ever
*did* work... I have a "ghetto KVM" setup here, using a monitor with
dual inputs and manually swapping the single USB cable for a "wireless
desktop" keyboard and mouse package between two machines. The one in
question is running 64-bit Ubuntu 9.04.
Oddly enough, this worked well enough until today, March 15, '09, when I
accepted the latest software updates. Now it seems that removing the
USB input device(s) doesn't hurt anything, but the act of reconnecting
them kills the X server.
The installed versions of likely culprits are:
Xorg "1:7.4~5ubuntu15",
HAL "0.5.12~rc1+git20090204-0ubuntu3",
gdm "2.20.9-0ubuntu1"
This bit of syslog demonstrates the issue:
Mar 16 00:49:27 anterior kernel: [33592.418580] usb 5-1: USB disconnect,
address 4
Mar 16 00:49:30 anterior kernel: [33596.088806] usb 5-1: new low speed USB
device using ohci_hcd and address 5
Mar 16 00:49:31 anterior kernel: [33596.264240] usb 5-1: configuration #1
chosen from 1 choice
Mar 16 00:49:31 anterior kernel: [33596.287615] input: GTech Wireless Keyboard
& Mouse Receiver as
/devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.0/input/input10
Mar 16 00:49:31 anterior kernel: [33596.320967] generic-usb
0003:1A81:0101.0007: input,hidraw0: USB HID v1.10 Keyboard [GTech Wireless
Keyboard & Mouse Receiver ] on usb-0000:00:13.0-1/input0
Mar 16 00:49:31 anterior kernel: [33596.340200] input: GTech Wireless Keyboard
& Mouse Receiver as
/devices/pci0000:00/0000:00:13.0/usb5/5-1/5-1:1.1/input/input11
Mar 16 00:49:31 anterior kernel: [33596.405203] generic-usb
0003:1A81:0101.0008: input,hiddev96,hidraw1: USB HID v1.10 Mouse [GTech
Wireless Keyboard & Mouse Receiver ] on usb-0000:00:13.0-1/input1
Mar 16 00:49:31 anterior kernel: [33596.854299] [drm] Resetting GPU
Mar 16 00:49:32 anterior gdm[21826]: WARNING: gdm_slave_xioerror_handler: Fatal
X error - Restarting :0
I can't seem to find the complaint in Xorg's logs right now; is gdm to
blame?
... I also can't be completely sure if this is actually being triggered
by a change in software or it's just that the system booted in a
different state (keyboard/mouse not connected and not taken over by
'legacy' emulation) than usual, though given that I've replugged dozens
of times in previous sessions and don't think I've ever met a BIOS
that'd re-acquire USB devices for "legacy" service, perhaps that's
unlikely to be the issue.
Just curious for any insight others may have; I'm not sure this wouldn't
also be a problem with actual USB KVMs of sufficiently cheap
construction.
** Affects: ubuntu
Importance: Undecided
Status: New
--
[Jaunty] Regression: X dies when USB core keyboard and pointer reconnected?
https://bugs.launchpad.net/bugs/343522
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