Hi! -----Veli-Matti Lintu <veli-matti.li...@opinsys.fi> skrev: ----- Till: ltsp-discuss@lists.sourceforge.net Från: Veli-Matti Lintu <veli-matti.li...@opinsys.fi> Datum: 2016-05-20 07:58 Ärende: Re: [Ltsp-discuss] problem with C-states
2016-05-19 22:26 GMT+03:00 Johan Kragsterman <johan.kragster...@capvert.se>: Hi! Just want to report a problem here. Current system is Ubuntu 16.04 server virtual machine(KVM on OmniOS), latest LTSP from greek schools repo, fat clients: mo'bo': ASUS J1900I-C - mITX, chassi: Chieftec Compact Series IX-03B, 8 GB DDR3L I been wining on this list about what I thought was a swap problem. Well, it wasn't. The problem occurred right after I switched from UBU 14.04 to 16.04. I got help to sort out ONE problem, the one with the metacity causing a reboot, but that wasn't my main problem. The main problem was that ONE of my clients were freezing after 1-2 hours. And only that client. I couldn't understand, and thought it was a hardware problem, I swapped everything, and I mean EVERYTHING, even mo'bo'. Didn't help...of coarse swapped network cable and switch port as well, power bord and PSU. Nothing helped... Then I started to check the bios, and found out that C-states was enabled in that client, and not in the others. It was also enabled in the new mo'bo' that I swapped to. So, disabled C-states and the problem was gone. Note that this was NOT a problem in 14.04, where the problematic client ran fine, with C-states enabled. I don't know if this is for Ubuntu or LTSP, I just mention it here, so people that perhaps get the same problem should know. It sounds like you are hitting this kernel bug: https://bugzilla.kernel.org/show_bug.cgi?id=109051 We've seen this problem on laptops having Intel Celeron N2940 CPUs and setting the kernel parameter max_cstate=1 has made them stable so far. I haven't tried any J1900 boards myself. The kernel bug has been open for quite some time, so I'd guess that there's no quick fix coming.. Yep, you're right, this is the one! Thanks for the valuable information! Okay, no problem for me running the C-state 1, or as it is now disabled... Rgrds Johan Veli-Matti ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net