Red Hat Bugzilla – Bug 1480014
power drain in sleep too fast
Last modified: 2017-08-09 19:46:40 EDT
Description of problem: In sleep mode, DC power is consumed much faster in Fedora 26 than it is in old Porteus 1.1 Linux. The speed of drainage in one test was the loss of about an hour of charge during two and a quarter to two and a half hours of sleep. With Porteus, the battery can be nearly empty and sleep still gives me lots of time to plug into AC. Example: Porteus in DC-only slept 2 hr 20 min when it went from 5 hr 21 min left to 5 hr 36 min left (not a typo, figures sometimes fluctuate); that's almost no drainage. Both OSes were used on my 64-bit Dell Latitude E4300 with the same high-capacity 3rd-party battery. F26 is installed on my hard drive and I run Porteus live from optical disc or RAM. I use gedit in F26 and KWrite in Porteus; they're open in sleep but they're not in use. While F26 uses USB Wi-Fi, Porteus uses the internal Wi-Fi; but no Wi-Fi should be running in sleep and the USB Wi-Fi (for F26) is not connected in sleep. When F26 was sleeping, awakening requires BIOS-level logging in (okay with me). How much battery charge is left is displayed in F26's Power app and in the Porteus KDE desktop's bottom panel's right end; the figures seem reliable but I'm not willing to pay the battery replacement cost to run the battery down to zero to find out. When sleeping, the laptop's power button LED fades and rebrightens through slow cycles and it does so in both Porteus and F26, so the hardware is apparently exonerated. It looks like something in F26 needs reprogramming.
Version-Release number of selected component (if applicable): I only guessed at the component and don't know how to get a version-release number. I have all updates to F26 through 8-6-17.
How reproducible: Not willing to try too often.
Steps to Reproduce:
1. Use the computer.
2. When putting to sleep, notice how much capacity is left.
3. When resuming from sleep, notice how long sleep was for and how much capacity is left at resumption.
Actual results: Sleep drains nearly as fast as normal use.
Expected results: Sleep should have little drain.