Hi!
Today I noticed high temp (~65°C) when coming out of screensaver, i.e., moving the mouse after the desktop go into screen lock mode.
Idle temp is usually ~ 45°C.
Desktop is an i3 running oS 13.2 64-bit KDE4.14.9, nvidia blob for GTX 650 with two 24" same model monitors attached, one through DVI and the other with a HDMI-DVI cable (monitors only have DVI ports).
In system-settings, Screensaver is set to start after 1 minute (Screen & Monitor > Session Locker) and power savings is set to 2 min for screen darkening (not an exact translation) and 3 min to switch the screen off.
Running top in batch mode I get idle CPU usage until screensaver kicks in:
top - **17:38:34** up 2:38, 4 users, load average: 0,16, 0,29, 0,32
Tasks: 236 total, 2 running, 233 sleeping, 0 stopped, 1 zombie
%Cpu(s): 4,1 us, 1,4 sy, 0,0 ni, 94,3 id, 0,2 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4289380 used, 12113128 free, 204284 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2670512 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5819 blimmer 20 0 464460 77780 56240 R 5,648 0,474 0:00.17 kscreenlocker_g
2411 blimmer 20 0 4462808 477756 178104 S 4,319 2,913 6:51.56 plasma-desktop
1063 root 20 0 275404 185524 147124 S 3,654 1,131 5:45.55 Xorg
2394 blimmer 20 0 574024 54432 32124 S 2,990 0,332 0:02.05 ksmserver
993 polkitd 20 0 516844 21736 9172 S 0,997 0,133 0:00.93 polkitd
2402 blimmer 20 0 3159512 154464 89624 S 0,997 0,942 24:34.92 kwin
2409 blimmer 20 0 782304 84756 53088 S 0,664 0,517 0:40.06 krunner
...
Between screensaver and screen off (two minutes duration, notice the time stamps) kwin ramps up to 100% of one core and stay there:
top - **17:38:37** up 2:38, 4 users, load average: 0,16, 0,29, 0,32
Tasks: 238 total, 2 running, 235 sleeping, 0 stopped, 1 zombie
%Cpu(s): 19,2 us, 11,5 sy, 0,0 ni, 69,1 id, 0,1 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4374488 used, 12028020 free, 204292 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2706668 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 blimmer 20 0 3213532 154484 89624 R **54,00** 0,942 24:36.54 kwin
1063 root 20 0 311404 221424 183024 S 26,33 1,350 5:46.34 Xorg
5819 blimmer 20 0 2919488 164404 106352 S 21,33 1,002 0:00.81 kscreenlocker_g
2411 blimmer 20 0 4462808 477756 178104 S 5,333 2,913 6:51.72 plasma-desktop
5822 blimmer 20 0 290164 37700 32604 S 4,000 0,230 0:00.12 kblankscrn.kss
5823 blimmer 20 0 290156 37432 32340 S 4,000 0,228 0:00.12 kblankscrn.kss
2394 blimmer 20 0 574024 54432 32124 S 2,667 0,332 0:02.13 ksmserver
2409 blimmer 20 0 782304 84756 53088 S 1,000 0,517 0:40.09 krunner
...
top - **17:38:40** up 2:38, 4 users, load average: 0,31, 0,32, 0,33
Tasks: 238 total, 2 running, 235 sleeping, 0 stopped, 1 zombie
%Cpu(s): 15,3 us, 15,0 sy, 0,0 ni, 69,3 id, 0,4 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4375676 used, 12026832 free, 204308 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2707260 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 blimmer 20 0 3213532 154484 89624 R **100,0** 0,942 24:39.55 kwin
2411 blimmer 20 0 4462808 477756 178104 S 14,95 2,913 6:52.17 plasma-desktop
1063 root 20 0 311404 221424 183024 S 3,654 1,350 5:46.45 Xorg
2466 blimmer 20 0 378412 40508 34420 S 0,997 0,247 1:34.68 qsynergy
...
top - **17:38:43** up 2:38, 4 users, load average: 0,36, 0,33, 0,34
Tasks: 238 total, 2 running, 235 sleeping, 0 stopped, 1 zombie
%Cpu(s): 12,2 us, 14,7 sy, 0,0 ni, 73,0 id, 0,1 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4375676 used, 12026832 free, 204316 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2707360 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 blimmer 20 0 3213532 154484 89624 R **99,67** 0,942 24:42.55 kwin
2411 blimmer 20 0 4462808 477756 178104 S 2,990 2,913 6:52.26 plasma-desktop
1063 root 20 0 311404 221424 183024 S 1,329 1,350 5:46.49 Xorg
2466 blimmer 20 0 378412 40508 34420 S 0,997 0,247 1:34.71 qsynergy
2409 blimmer 20 0 782304 84756 53088 S 0,664 0,517 0:40.12 krunner
...
top - **17:40:31** up 2:40, 4 users, load average: 0,88, 0,52, 0,40
Tasks: 237 total, 2 running, 234 sleeping, 0 stopped, 1 zombie
%Cpu(s): 12,7 us, 14,8 sy, 0,0 ni, 72,3 id, 0,2 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4376048 used, 12026460 free, 204628 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2711272 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 blimmer 20 0 3213532 154484 89624 R **100,7** 0,942 26:30.85 kwin
2411 blimmer 20 0 4462808 477756 178104 S 4,333 2,913 6:56.67 plasma-desktop
1063 root 20 0 311404 221424 183024 S 3,333 1,350 5:49.46 Xorg
2409 blimmer 20 0 782304 84756 53088 S 0,667 0,517 0:40.83 krunner
...
top - **17:40:34** up 2:40, 4 users, load average: 0,89, 0,52, 0,41
Tasks: 236 total, 1 running, 234 sleeping, 0 stopped, 1 zombie
%Cpu(s): 12,5 us, 12,1 sy, 0,0 ni, 72,1 id, 3,2 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4372472 used, 12030036 free, 204640 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2711348 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2402 blimmer 20 0 3232168 154484 89624 S **81,73** 0,942 26:33.31 kwin
1063 root 20 0 311404 221424 183024 S 4,651 1,350 5:49.60 Xorg
2388 root 20 0 355768 7836 6048 S 4,319 0,048 0:05.73 udisksd
2411 blimmer 20 0 4462808 477756 178104 S 3,654 2,913 6:56.78 plasma-desktop
2466 blimmer 20 0 378412 40508 34420 S 1,329 0,247 1:35.79 qsynergy
2409 blimmer 20 0 782304 84756 53088 S 0,664 0,517 0:40.85 krunner
top - **17:40:37** up 2:40, 4 users, load average: 0,89, 0,52, 0,41
Tasks: 236 total, 2 running, 233 sleeping, 0 stopped, 1 zombie
%Cpu(s): 3,8 us, 0,8 sy, 0,0 ni, 90,3 id, 5,1 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem: 16402508 total, 4401072 used, 12001436 free, 204648 buffers
KiB Swap: 2097148 total, 0 used, 2097148 free. 2711396 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2411 blimmer 20 0 4462808 507736 178104 R 6,977 3,095 6:56.99 plasma-desktop
2388 root 20 0 355768 7836 6048 S 3,987 0,048 0:05.85 udisksd
1063 root 20 0 311404 221424 183024 S 3,654 1,350 5:49.71 Xorg
2466 blimmer 20 0 378412 40508 34420 S 0,997 0,247 1:35.82 qsynergy
2402 blimmer 20 0 3232168 154484 89624 S 0,664 0,942 26:33.33 kwin
If I disable screensaver - monitor gets switched off after a few minutes - there’s no CPU usage / temperature increase.
The screensaver is nice but not important, so I’ll leave it off.
I googled the issue but couldn’t find anything similar reported, the closer was https://forums.opensuse.org/showthread.php/503964-Kwin-infinite-loop-100-load
Any suggestions?
TIA