Hi, On Thu, Jan 11, 2018 at 04:05:47PM +0100, Helge Tore Høyland wrote: > On a newly installed Debian-Edu 9 with LXDE as destop, some of my > newer(faster) diskless clients fail to boot properly. > This seems to be a sort of race condition. Sometimes it happens early in the > boot. That is rare though, so i dont have logs for that yet, but i remeber > something bout "SQUASHFS". Most of the time the client gets a black screen > when ldm starts up. When that happens, I can alt+ctrl+F2 to get another > session, log in an look at logs. Syslog allways ends with: > > "block nbd9: NBD_DISCONNECT" > "block nbd9: shutting down socket" This is quite normal, nbd9 is used only for a test connection. The real bock device used as LTSP client image is nbd0. > Doing: cat syslog | grep error | less > > I get some failed driver messages for wifi and bluetooth that i think is > irrelevant. Then i get: > > "blk_update_request: I/O error, dev nbd9, sector 7002672" > "Buffer I/O error on dev ndb9, logical block 3501336, async page read" Strange... Did you try after rebuilding the NBD image (ltsp-update-image)? If only _some_ clients are failing with a black screen, a different graphics chip set could cause it. Maybe setting a different color depth (16, 24 or 32) would be of help; see the manual how to do it: https://wiki.debian.org/DebianEdu/Documentation/Stretch/HowTo/NetworkClients#LTSP_client_configuration_in_LDAP_.28and_lts.conf.29 Wolfgang
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