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+--- Thread: PineTab2 screen won't turn back on until reboot (/showthread.php?tid=18629)
PineTab2 screen won't turn back on until reboot - KelsonV - 08-21-2023
This is a different problem than the one that's been reported where the screen just won't turn on at all.
It's also different from suspend/hibernate not working, because the system is still running and reachable via SSH.
The screen is turning off after a period of inactivity (even though I've set power management not to turn off the screen) and won't turn back on until I reboot the tablet. The keys light up when I press them. The USB network adapter I have shows activity. I can even SSH in from another computer.
But the screen *does* come back on after reboot, whether I use the command line through an SSH session, or whether I just hold the power button down until it shuts off, then power it on again.
I'm currently using LxQt on the factory-shipped danctnix updated to the latest with pacman.
Has anyone else seen this? Any solution, or a tip for finding what else might be powering off the screen if my desktop session isn't doing it?
RE: PineTab2 screen won't turn back on until reboot - cgbarros - 08-22-2023
I haven't use LxQT for a while, but I assume it runs X and not Wayland, correct? If so, try to SSH into your device and run
$ xset -q
What do you get?
RE: PineTab2 screen won't turn back on until reboot - KelsonV - 08-22-2023
Thanks for pointing me in the right direction! Yeah, LXQT is running under X. I had to script a loop to repeatedly save that output to a log, since the remote SSH session couldn't talk to the main X session, but what I found is:
- DPMS is enabled, with the standby, suspend and off timeouts at 600 -- which it shouldn't be, because LXQt is set to not standby or suspend, but....
- There is a bug in LXQT's power management where it doesn't always update DPMS's settings.
- DPMS sees the monitor as off.
I also verified that the timeouts, lock screen etc. do still work correctly under Wayland on my device, so that's good to know!
That gives me a couple of approaches (workarounds, or manually installing the newer version, etc.) to prevent the problem of it turning off when I don't want it to. (I really do not miss all that messing with X configuration back in the old days, but hey, you gotta do what works.)
Then I need to figure out how to get it to turn back on. If LxQt's own power management works right (except for the dpms issue), then problem solved. It not, I figure I'll experiment with blank, standby, and suspend to see which ones (if any) the display recovers from.
--------------------
For the record: Full output of xset -q after the display turns off:
Code:
Keyboard Control:
auto repeat: on key click percent: 0 LED mask: 00000000
XKB indicators:
00: Caps Lock: off 01: Num Lock: off 02: Scroll Lock: off
03: Compose: off 04: Kana: off 05: Sleep: off
06: Suspend: off 07: Mute: off 08: Misc: off
09: Mail: off 10: Charging: off 11: Shift Lock: off
12: Group 2: off 13: Mouse Keys: off
auto repeat delay: 500 repeat rate: 33
auto repeating keys: 00ffffffdffffbbf
fadfffefffedffff
9fffffffffffffff
fff7ffffffffffff
bell percent: 0 bell pitch: 400 bell duration: 100
Pointer Control:
acceleration: 2/1 threshold: 4
Screen Saver:
prefer blanking: yes allow exposures: yes
timeout: 600 cycle: 600
Colors:
default colormap: 0x20 BlackPixel: 0x0 WhitePixel: 0xffffff
Font Path:
built-ins
DPMS (Display Power Management Signaling):
Standby: 600 Suspend: 600 Off: 600
DPMS is Enabled
Monitor is OffRE: PineTab2 screen won't turn back on until reboot - diederik - 08-23-2023
(08-21-2023, 03:23 PM)KelsonV Wrote: The screen is turning off after a period of inactivity (even though I've set power management not to turn off the screen) and won't turn back on until I reboot the tablet. The keys light up when I press them. The USB network adapter I have shows activity. I can even SSH in from another computer.
But the screen *does* come back on after reboot, whether I use the command line through an SSH session, or whether I just hold the power button down until it shuts off, then power it on again.
I'm currently using LxQt on the factory-shipped danctnix updated to the latest with pacman.
Has anyone else seen this? Any solution, or a tip for finding what else might be powering off the screen if my desktop session isn't doing it?
I'm using a self-assembled Debian (Trixie) system with self-compiled kernel running KDE, and I've run into this problem too.
AFAICT it's all running Wayland, perhaps except SDDM.
I haven't found a solution yet, but I'm very much interested in one.
Haven't verified if it's also present in the Danctnix system though.