On 2016-10-13, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote: > > On Thu, October 13, 2016 11:55 am, Mike - st257 wrote: >> On Thu, Oct 13, 2016 at 11:33 AM, Valeri Galtsev >> <galtsev at kicp.uchicago.edu> wrote: >> >>> Dear Experts, >>> >>> Could someone point me in the right direction: how can I disable >>> hybernate/suspend in CentOS 7? >>> >>> I get workstations for graduate students with decent amount of RAM >>> (32 GB), and for machines with large RAM I either do not have swap >>> at all of have some small (4 GB) swap. As I remember from older >>> manuals, one has to have at least twice amount of swap compared to >>> physical RAM for hybernate/suspend to work. This probably is what >>> bit me: new Dells came with keyboard that has sleep button, when one >>> hits that button the machine locks up. (it stays powered on, does >>> not respond mouse, keyboard, does not respond ping). >>> >>> I would like to disable that sleep button on keyboard. (I'm kind of >>> trying to avoid replacing keyboard with the ones that do not have >>> "sleep" key). >>> >> >> Have you tried disabling power management via GRUB options? >> http://askubuntu.com/a/130541 >> > > Mike, thanks! You gave me good enough push into right direction, > thanks to which I solved my problem. > > Disabling power management via GRUB (boot) options didn't help me. I > went further along these lines, tried to tweak related stuff in > /etc/systemd/login.conf (systemd experts will probably lough, I'm not > one, so... ;-) - didn't help either. I finally came to doing what > helped me: edited > > /usr/share/polkit-1/actions/org.freedesktop.login1.policy > > (replaced "yes" with "no" in a few related places). This solved my > problem. I'm not posting what exactly I changed, as I overdid it > (disabled locally logged in user's ability to reboot/poweroff machine, > and the same from gdm loging screen - I will need to restore these). > > Thanks! Valeri Be aware that the file /usr/share/polkit-1/actions/org.freedesktop.login1.policy is not a configfile and will be silently overwritten when systemd is upgraded. In earlier releases of PolicyLit local changes were made in /etc/polkit-1/localauthority, but I don't know if that approach still works. -- Liam