Someone else recently "solved" such a problem by uninstalling Compiz.
In my case, however, I am on Lubuntu which does not use Compiz.
On 12/16/2012 8:45 AM, Garry Schakel wrote:
I have been playing with Ubuntu,Edubuntu and Kubuntu for about a week
now (off and on for about a year)
I tried Edubuntu with a KDE Desktop and when I logged on with a client
the server gave me an Compiz Error
I then tried Ubuntu 12.04 with the F4 Option, but when I tried to
login the screen was so messed up I had to power down the client to
get out of it.
After I powered up again I logged in using Ubuntu 2D Session and
everything worked fine.
I think that there is something in LTSP that does not like Ubuntu's
Compiz (3D) feature.
Garry
------------------------------------------------------------------------
Date: Tue, 11 Dec 2012 17:31:03 -0500
From: [email protected]
To: [email protected]; [email protected]
Subject: Re: client specific problem
On 12/11/2012 12:20 PM, John Hupp wrote:
Some updates on thesame or very similar problem here:
My understanding of this problem has evolved some, so I am keeping
the topic but writing afresh on the description.
It now appears that there are two groups of problems. For one
group, the client's /var/log/Xorg.?.log makes it clear that there
is a video driver problem, and I am putting that group aside for
the moment.
For the other group, the client's /var/log/Xorg.?.log looks
normal, but during startup after the splash screen it never
reaches the login screen, and instead there is a cycling between
blank and black screens. And with client syslog messages forwarded
to the server, there is a loop of NBD messages in the server
syslog, initially mixed with NTP/D messages, but eventually
settling down to just the loop of NBD messages (see toward the
bottom):
(snipped normal-looking part of server syslog ...)
Dec 11 09:57:00 ltsp137 modem-manager[1087]: <info> Successfully
loaded 20 plugins
Dec 11 09:57:04 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:04 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:04 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:04 Lubuntu1 nbd_server[2238]: Starting to serve
Dec 11 09:57:04 Lubuntu1 nbd_server[2238]: Size of exported
file/device is 923074560
Dec 11 09:57:06 ltsp137 kernel: [ 31.545915] nbd9: unknown
partition table
Dec 11 09:57:04 Lubuntu1 nbd_server[2238]: Disconnect request
received.
Dec 11 09:57:04 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:06 ltsp137 kernel: [ 31.552578] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:06 ltsp137 kernel: [ 31.553503] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:06 ltsp137 kernel: [ 31.553592] block nbd9: queue
cleared
Dec 11 09:57:07 ltsp137 ntpdate[890]: step time server
128.138.140.44 offset -1.585937 sec
Dec 11 09:57:07 ltsp137 ntpd[1216]: ntpd [email protected]
<mailto:[email protected]> Mon Aug 20 14:49:15 UTC 2012 (1)
Dec 11 09:57:07 ltsp137 ntpd[1217]: proto: precision = 0.503 usec
Dec 11 09:57:07 ltsp137 ntpd[1217]: ntp_io: estimated max
descriptors: 1024, initial socket boundary: 16
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen and drop on 0
v4wildcard 0.0.0.0 UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen and drop on 1
v6wildcard :: UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 2 lo
127.0.0.1 UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 3 eth0
192.168.1.137 UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 4 eth0
fdd9:1d03:df5:0:250:4ff:feb0:ccfe UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 5 eth0
fe80::250:4ff:feb0:ccfe UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 6 eth0
fdd9:1d03:df5:0:4dd4:a667:5962:d43f UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listen normally on 7 lo ::1
UDP 123
Dec 11 09:57:07 ltsp137 ntpd[1217]: peers refreshed
Dec 11 09:57:07 ltsp137 ntpd[1217]: Listening on routing socket on
fd #24 for interface updates
Dec 11 09:57:12 ltsp137 ntpd[1217]: ntpd exiting on signal 15
Dec 11 09:57:13 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:13 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:13 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:13 Lubuntu1 nbd_server[2239]: Starting to serve
Dec 11 09:57:13 Lubuntu1 nbd_server[2239]: Size of exported
file/device is 923074560
Dec 11 09:57:13 ltsp137 kernel: [ 40.306413] nbd9: unknown
partition table
Dec 11 09:57:13 Lubuntu1 nbd_server[2239]: Disconnect request
received.
Dec 11 09:57:13 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:13 ltsp137 kernel: [ 40.313194] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:13 ltsp137 kernel: [ 40.314074] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:13 ltsp137 kernel: [ 40.314148] block nbd9: queue
cleared
Dec 11 09:57:17 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:17 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:17 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:17 Lubuntu1 nbd_server[2240]: Starting to serve
Dec 11 09:57:17 Lubuntu1 nbd_server[2240]: Size of exported
file/device is 923074560
Dec 11 09:57:17 ltsp137 kernel: [ 44.066204] nbd9: unknown
partition table
Dec 11 09:57:17 Lubuntu1 nbd_server[2240]: Disconnect request
received.
Dec 11 09:57:17 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:17 ltsp137 kernel: [ 44.072999] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:17 ltsp137 kernel: [ 44.073591] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:17 ltsp137 kernel: [ 44.073644] block nbd9: queue
cleared
Dec 11 09:57:21 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:21 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:21 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:21 Lubuntu1 nbd_server[2241]: Starting to serve
Dec 11 09:57:21 Lubuntu1 nbd_server[2241]: Size of exported
file/device is 923074560
Dec 11 09:57:21 ltsp137 kernel: [ 47.831221] nbd9: unknown
partition table
Dec 11 09:57:21 Lubuntu1 nbd_server[2241]: Disconnect request
received.
Dec 11 09:57:21 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:21 ltsp137 kernel: [ 47.837973] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:21 ltsp137 kernel: [ 47.838709] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:21 ltsp137 kernel: [ 47.838800] block nbd9:
shutting down socket
Dec 11 09:57:21 ltsp137 kernel: [ 47.838819] block nbd9: queue
cleared
Dec 11 09:57:23 ltsp137 ntpdate[1301]: adjust time server
208.53.158.34 offset 0.001939 sec
Dec 11 09:57:23 ltsp137 ntpd[1633]: ntpd [email protected]
<mailto:[email protected]> Mon Aug 20 14:49:15 UTC 2012 (1)
Dec 11 09:57:23 ltsp137 ntpd[1634]: proto: precision = 0.505 usec
Dec 11 09:57:23 ltsp137 ntpd[1634]: ntp_io: estimated max
descriptors: 1024, initial socket boundary: 16
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen and drop on 0
v4wildcard 0.0.0.0 UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen and drop on 1
v6wildcard :: UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 2 lo
127.0.0.1 UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 3 eth0
192.168.1.137 UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 4 eth0
fdd9:1d03:df5:0:250:4ff:feb0:ccfe UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 5 eth0
fe80::250:4ff:feb0:ccfe UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 6 eth0
fdd9:1d03:df5:0:4dd4:a667:5962:d43f UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listen normally on 7 lo ::1
UDP 123
Dec 11 09:57:23 ltsp137 ntpd[1634]: peers refreshed
Dec 11 09:57:23 ltsp137 ntpd[1634]: Listening on routing socket on
fd #24 for interface updates
Dec 11 09:57:24 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:24 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:24 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:24 Lubuntu1 nbd_server[2242]: Starting to serve
Dec 11 09:57:24 Lubuntu1 nbd_server[2242]: Size of exported
file/device is 923074560
Dec 11 09:57:24 ltsp137 kernel: [ 51.675584] nbd9: unknown
partition table
Dec 11 09:57:24 Lubuntu1 nbd_server[2242]: Disconnect request
received.
Dec 11 09:57:24 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:24 ltsp137 kernel: [ 51.682372] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:24 ltsp137 kernel: [ 51.683392] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:24 ltsp137 kernel: [ 51.683470] block nbd9: queue
cleared
Dec 11 09:57:28 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:28 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:28 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:28 Lubuntu1 nbd_server[2243]: Starting to serve
Dec 11 09:57:28 Lubuntu1 nbd_server[2243]: Size of exported
file/device is 923074560
Dec 11 09:57:28 ltsp137 kernel: [ 55.424453] nbd9: unknown
partition table
Dec 11 09:57:28 Lubuntu1 nbd_server[2243]: Disconnect request
received.
Dec 11 09:57:28 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:28 ltsp137 kernel: [ 55.438244] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:28 ltsp137 kernel: [ 55.438792] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:28 ltsp137 kernel: [ 55.438844] block nbd9: queue
cleared
Dec 11 09:57:32 Lubuntu1 nbd_server[1685]: connect from
192.168.1.137, assigned file is /opt/ltsp/images/i386.img
Dec 11 09:57:32 Lubuntu1 nbd_server[1685]: Can't open
authorization file /etc/ltsp/nbd-server.allow (No such file or
directory).
Dec 11 09:57:32 Lubuntu1 nbd_server[1685]: Authorized client
Dec 11 09:57:32 Lubuntu1 nbd_server[2245]: Starting to serve
Dec 11 09:57:32 Lubuntu1 nbd_server[2245]: Size of exported
file/device is 923074560
Dec 11 09:57:32 ltsp137 kernel: [ 59.196619] nbd9: unknown
partition table
Dec 11 09:57:32 Lubuntu1 nbd_server[2245]: Disconnect request
received.
Dec 11 09:57:32 Lubuntu1 nbd_server[1685]: Child exited with 0
Dec 11 09:57:32 ltsp137 kernel: [ 59.203549] block nbd9:
NBD_DISCONNECT
Dec 11 09:57:32 ltsp137 kernel: [ 59.204048] block nbd9: Receive
control failed (result -32)
Dec 11 09:57:32 ltsp137 kernel: [ 59.204100] block nbd9: queue
cleared
I read in an IRC archive that the nbd9 messages are somehow
normal: "nbd9 disconnection is normal, it's just a way to check
for a newer chroot image, in order for the clients to
automatically reboot." I don't quite know what that means, other
than it indicates that broken nbd/server is not the problem here.
In at least one case with a certain video chipset, that cycling
block of messages has this message interspersed just before many
of the "nbd9: unknown partition table" messages:
Dec 10 20:28:10 ltsp138 kernel: [ 82.844422] ldm[4166]:
segfault at 8 ip 0804baf4 sp bf8ab830 error 4 in ldm[8048000+6000]
I think for that case, the black screen shows a spinning progress
screen pointer for a moment before it goes to the blank screen.
Since the problem goes away with known-working video chipsets, the
startup failure seems video related, but I have not been able to
pin down the failure mechanism.
If I don't get more pointed advice in the meantime, I think I'm
going to work on learning how to use xorg.conf to force usage of
perhaps the vesa driver. And if that works, then try to
troubleshoot the primary intended driver. My working theory is
that, despite the good-looking xorg log, this is still a video
driver problem.
With a very tenuous understanding of xorg workings, I created the
directory /etc/X11/xorg.conf.d, and in that, a file named
xorg_ltsp.conf (must end with .conf). Then I updated the image.
Contents of that file:
Section "Device"
Identifier "Card2"
Driver "vesa"
BusID "PCI:0:8:0"
EndSection
The default Identifier "Card0" might have worked also, but I was fuzzy
about bad interactions with video card configuration on the server.
And rightly so, it seems. The server had been using the ATI driver,
but now it is using the FBDEV driver. This despite the fact that the
above Device section specifies a BusID that does not match the BusID
of the server's video card.
But apart from that, in the client an ATI Mach64 card that had stalled
with cycling black/blank screens now proceeds to the login and then to
a normal desktop.
So I confirmed the theory that the behavior is related to some driver
issue despite a normal-looking client Xorg log, but I don't yet know
how to best solve the client problem without affecting the server. And
I would prefer to solve the client problem by making the more capable
driver work (here, the ATI driver).
-- edubuntu-users mailing list [email protected] Modify
settings or unsubscribe at:
https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
--
edubuntu-users mailing list
[email protected]
Modify settings or unsubscribe at:
https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
