Screen not coming back from sleep mode
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Hello,
I find Trisquel to be very stable and good for all my needs. Thank you to all the team.
There is only one small thing that I have noticed, not very problematic but maybe someone has observed it already: when I use the external screen (with hdmi cable) the screen does not always come back to display the desktop after I wake it from sleep. I am talking about the screen entering sleep mode, not the system. I need to turn the screen off and on manually to make it display the desktop again, moving the mouse is not enough. Everything else works very well.
I wonder if trying nomodeset would work? Edit the file /etc/default/grub and look for the line that has GRUB_CMDLINE_LINUX_DEFAULT. Add nomodeset to it like:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
Then do sudo update-grub and reboot and see if it fixes it. If not, then undo this change to that file. (And run sudo update-grub again).
Thank you very much, I will try this for some time and see if the problem appears again.
I had forgotten the second part of the instruction (update-grub), so the system was starting as usual, but I also forgot to turn on the external monitor before system start.
So I turned on the monitor while the desktop was already started and the problem appeared: when the monitor went to sleep mode it did not return after moving the mouse or pressing a key. I had to turn it off and on again manually. After several trials, the situation is that the monitor needs to be turned on during system start in order to go out of sleep mode automatically during the session. I can try to remember to do that, or turn it off and on manually if I forget.
After adding "nomodeset" and doing "sudo update-grub", I can only log in and use command lines. So I removed "nomodeset" and I can access the desktop again. So the origin of the situation is something else. Thank you for your help.
After more testing, in fact I do not know what causes the situation.
It happens from time to time only, the monitor may have been on or off during start, it is not the explanation. Or maybe it is a combination of that and something else.
I will try to find some error messages next time it happens. It is using i915 for Intel integrated graphics.