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I have Asus X756UQ laptop. I installed Arch and Windows 10 a few days ago.
I noticed that on Arch the battery discharges much faster.
This is what powertop shows:
Summary: 3361.3 wakeups/second, 0.0 GPU ops/seconds, 0.0 VFS ops/sec and 41.0% CPU use
Power est. Usage Events/s Category Description
6.90 W 6.2 ms/s 1744.0 Interrupt [17] idma64.1
1.55 W 10.7 ms/s 365.0 Process [PID 406] [irq/109-ELAN100]
1.50 W 8.6 ms/s 376.8 Timer tick_sched_timer
[17] idma64.1 - it causes high cpu usage. Usually interval is not 6.2 ms/s but about 600 µs/s(I don't know if it is important). This problem exists only when I use touchpad.
To be more specific, even if I turn off touchpad using: "xinput disable 'Elan Touchpad' ", when I touch touchpad this problem also occurs, but when I don't it immediately disappears.
I tried both: libinput and synaptics drivers but effect is the same.
I had following message in journalctl -k | grep ELAN
Mar 23 01:47:23 ArchSUS kernel: elan_i2c i2c-ELAN1000:00: i2c-ELAN1000:00 supply vcc not found, using dummy regulator
Mar 23 01:47:23 ArchSUS kernel: elan_i2c i2c-ELAN1000:00: Elan Touchpad: Module ID: 0x0005, Firmware: 0x0004, Sample: 0x000d, IAP: 0x000e
So acording to Arch libinput wiki I added option psmouse elantech_smbus=0 to /etc/modprobe.d/psmouse.conf but it didn't help :\
I checked whether this problem exist also on Ubuntu Live and powertop showed exactly the same problem... I started to think that it is hadware issue, but when I use Windows 10 everything is fine and CPU doesn't freaks.
Also I have to add that touchpad is working properly on both Arch and Windows, there is no problem with multitouch or anything like this.
What should I do?
Btw. I am newbie and I don't know if I'm posting in the right forum.
Last edited by Matix (2020-03-23 22:25:35)
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