On 2016-10-13, Valeri Galtsev galtsev@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@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.