On Fri, Mar 01, 2019 at 09:39:27AM -0800, Srinivas Pandruvada wrote: > On Fri, 2019-03-01 at 13:43 +0100, Rafael J. Wysocki wrote: > > Hi All, > > > > This is how I would fix the issue reported in BZ 200759 (see this > > patch series > > from Yu too: https://marc.info/?l=linux-pm&m=155137672924029&w=2). > > > > Patch [1/2] causes intel_pstate to update all policies if it gets a > > _PPC change > > notification and sees a global turbo disable/enable change. > > > > Patch [2/2] makes it update cpuinfo.max_freq for all policies in > > those cases. > > > > The patches here have not been tested yet, so testing would be much > > appreciated. > > > > Of course, comments are welcome too! > > This is the only platform, someone reported such issue. > Can we solve this by some udev rules and offline/online cpu 1-3 on > power source change? > Sound reasonable, we can deal with this BIOS problem in user space too. But if cpu0 could not be offline, how could cpu0's policy be updated?
Thanks, Yu > There are examples of changing governors on power source change. > https://bbs.archlinux.org/viewtopic.php?id=207186 > > Here instead of changing governor just > echo 0 > /sys/devices/system/cpu/cpu1/online > echo 1 > /sys/devices/system/cpu/cpu1/online > echo 0 > > /sys/devices/system/cpu/cpu2/online > echo 1 > > /sys/devices/system/cpu/cpu2/online > echo 0 > > /sys/devices/system/cpu/cpu3/online > echo 1 > > /sys/devices/system/cpu/cpu3/online > > Thanks, > Srinivas > > > > > Thanks, > > Rafael > > >
