client specific problem
John Hupp
edubuntu at prpcompany.com
Sun Dec 16 16:51:37 UTC 2012
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: edubuntu at prpcompany.com
> To: sirio81 at gmail.com; edubuntu-users at lists.ubuntu.com
> 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 4.2.6p3 at 1.2290-o
> <mailto:4.2.6p3 at 1.2290-o> 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 4.2.6p3 at 1.2290-o
> <mailto:4.2.6p3 at 1.2290-o> 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 edubuntu-users at lists.ubuntu.com Modify
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