https://bugzilla.kernel.org/show_bug.cgi?id=64251 Bug ID: 64251 Summary: Intel Pstate driver minimum percent does not change with turbo off Product: Power Management Version: 2.5 Kernel Version: 3.12rc7 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: cpufreq Assignee: cpufreq@xxxxxxxxxxxxxxx Reporter: dsmythies@xxxxxxxxx Regression: No Created attachment 113141 --> https://bugzilla.kernel.org/attachment.cgi?id=113141&action=edit Frequency Vs. Requested Frequency When turbo is turned off the maximum frequency percent does not change. O.K. So the minimum frequency percent should change, but it doesn't. Using my computer as an example: The turbo on maximum frequency is 3.8 GHz; The turbo off maximum frequency is 3.4 GHz; The minimum frequency is 1.6 GHz. Therefore we would expect: For turbo on, max percent = 100, min percent = 42; For turbo off, max percent = 100, min percent = 47. starting from a fresh boot: doug@s15:~$ uname -a Linux s15 3.12.0-rc7+ #48 SMP Fri Nov 1 21:09:51 PDT 2013 x86_64 x86_64 x86_64 GNU/Linux doug@s15:~$ cat /sys/devices/system/cpu/intel_pstate/* 100 42 0 doug@s15:~$ cd temp doug@s15:~/temp$ sudo ./set_cpu_turbo_off [sudo] password for doug: doug@s15:~/temp$ cat /sys/devices/system/cpu/intel_pstate/* 100 42 1 doug@s15:~/temp$ cat set_cpu_turbo_off #! /bin/bash echo "1" > /sys/devices/system/cpu/intel_pstate/no_turbo The attached png file demonstrates. (the rounding part will be a separate bug report) Note: This bug is extracted from bug 59481 which mentioned several issues, the main issue was solved and the bug closed. Now I am following up on the other issues. -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
