[opensuse] High power consumption Laptop
Hey, after installing 13.2 I'm struggling with several problems. One of the problems I haven't been able to solve yet, is the high power consumption of a ThinkPad T430s with Ivy bridge and Intel HD Graphics (NVidia Optimus is completely disabled via the BIOS). After activating powersave for Intel WiFi and Intel HDA Sound, the old 13.1 installation consumes about 8.5W at 60% screen brightness.[0] Under the same prerequisites, the 13.2 installation consumes 10.5W, i.e., 25% more. Powertop is clueless and thinks the display backlight consumes 9W ( and at 0% brightness 7W). According to http://www.phoronix.com/scan.php?page=news_item&px=MTc3NTE there is a power regression in the Intel Graphics driver. Although the underlying change should only affect Haswell, there are reports that Ivy Bridge might suffer, too. However, forcing Frame Buffer Compression does not considerably reduce the power consumption of the 13.2 installation. Any ideas? Gruß Jan [0] When enabling SATA ALPM 1-2 W less but the Intel 520 Series SSD has a bug that could yield to data loss. -- You cannot help men permanently by doing for them what they could and should do for themselves. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org
Am Montag, 29. Dezember 2014, 15:06:36 schrieb Jan Ritzerfeld:
[...] After activating powersave for Intel WiFi and Intel HDA Sound, the old 13.1 installation consumes about 8.5W at 60% screen brightness.[0] Under the same prerequisites, the 13.2 installation consumes 10.5W, i.e., 25% more. Powertop is clueless and thinks the display backlight consumes 9W ( and at 0% brightness 7W). [...]
I haven't found any solution, yet. However, there's a suspicious increase in wakeups/s from 100 to 125. That is, irq/47-iwlwifi, mysqld, yakuake, and nscd render themselves conspicuous. mysqld: 25 wakeups/s That is mysqld of akonadi and with 13.1 it didn't do that. But 13.2 installed MariaDB version 10 instead of 5. That mysqld spawns roundabout 50 (sic!) threads that "select" or "futex resumed" with "Timeout" or "Connection timed out" all the time. However, quitting the akonadi server and, thereby, mysqld doesn't change the power consumption significantly, 0.1W maybe. nscd und yakuake: 20 and 10 wakeups/s Starting "nscd -d" manually discloses that yakuake (two open tabs) triggers 4 times a second GETPWBYUID and additionally 4 times a GETPWBYNAME. That didn't happen with 13.1. KDE Konsole isn't much better, well, yakuake just uses the Konsole KPart. Anyway, building konsole of 13.1 with OBS for 13.2 didn't change anything. Quitting yakuake and starting powertop in xterm saves 0.3W then. irq/47-iwlwifi: 20 wakeups/s There is always some traffic on wlp3s0 (1-3 pkts/s). However, this is caused by the general network setup (broad- and multicast SSDP, mDNS, IGMP), which didn't change. Disabling WiFi saves 0.6W, but then WiFi is disabled. All in all, I can reduce the wakeups/s to 25 and CPU use to under 1%. Even so, 13.2 without WiFi consumes 1W more than 13.1 with WiFi. It seems to me that some device doesn't go to deep sleep anymore. It's a mystery to me. Gruß Jan -- Today is the day you worried about yesterday. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org
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Jan Ritzerfeld