https://bugzilla.kernel.org/show_bug.cgi?id=78111

Alex Deucher alexdeucher@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher alexdeucher@gmail.com --- Please attach your dmesg output with radeon.dpm=1

https://bugzilla.kernel.org/show_bug.cgi?id=78111

Kertesz Laszlo laszlo.kertesz@gmail.com changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |laszlo.kertesz@gmail.com

--- Comment #3 from Kertesz Laszlo laszlo.kertesz@gmail.com --- I reported basicalle the same thing in bug #62861. How dangerous can this change be? As in would i have to worry about frying the APU?

https://bugzilla.kernel.org/show_bug.cgi?id=78111

--- Comment #5 from Marko Srebre bgz.marko@gmail.com --- Created attachment 140061 --> https://bugzilla.kernel.org/attachment.cgi?id=140061&action=edit dmesg output (with enable bapm path)

https://bugzilla.kernel.org/show_bug.cgi?id=78111

--- Comment #7 from Alex Deucher alexdeucher@gmail.com --- We can probably enable it by default on KV/KB systems at some point. It had some stability issues on trinity APUs so I disabled it across the board, so it remains to be seen if there are any problems with newer APUs.

https://bugzilla.kernel.org/show_bug.cgi?id=78111

--- Comment #9 from Marko Srebre bgz.marko@gmail.com --- I've been using enable_bapm for a day now, here are my observations:

* There are no issues regarding lockups. Not even when plugging/unplugging AC adapter or sleeping/resuming.

* Boost state is active on boot regardless of AC begin plugged or not. However, boost will get deactivated if at a later time AC is deplugged, and get activated again on plugging. While this may make sense in some situations, I prefer boost being always active, so for the time being I just changed the relevant code so it's always on. I guess it would make sense for it to be an option that could be tuned.

* There is some strange behaviour associated with this particular APU (A6-1450). This is probably not Linux specific as I've seen reports on it for Windows too. After boot turbo would only work for a single core and up to 1.3Ghz. But after doing a sleep/resume cycle turbo works for all 4 cores and up to full 1.4Ghz (the difference is also quite audible since the fans go wild). As if available TDP would somehow get much bigger after sleep/resume.

https://bugzilla.kernel.org/show_bug.cgi?id=78111

--- Comment #11 from Alex mad_sam@bk.ru --- (In reply to Alex from comment #10)

AMD A8-5557M (Richland). APU turbo core boost still is not working.

With radeon.dpm=1

boost state support: Supported: yes Active: no Boost States: 3 Total States: 8 Pstate-Pb0: 3100MHz (boost state) Pstate-Pb1: 2800MHz (boost state) Pstate-Pb2: 2400MHz (boost state) Pstate-P0: 2100MHz Pstate-P1: 1900MHz Pstate-P2: 1700MHz Pstate-P3: 1400MHz Pstate-P4: 900MHz

|Mperf               || Idle_Stats

CPU | C0 | Cx | Freq || POLL | C1 | C2 0| 20,65| 79,35| 2082|| 0,00| 16,43| 66,12 1| 42,31| 57,69| 2091|| 0,00| 1,22| 57,65 2| 72,17| 27,83| 2093|| 0,00| 1,44| 26,81 3| 16,95| 83,05| 2090|| 0,00| 3,68| 82,30

With radeon.dpm=0

boost state support: Supported: yes Active: yes

|Mperf || Idle_Stats CPU | C0 | Cx | Freq || POLL | C1 | C2 0| 51,88| 48,12| 2731|| 0,00| 6,83| 42,66 1| 38,85| 61,15| 2742|| 0,00| 0,40| 61,93 2| 42,05| 57,95| 2821|| 0,00| 32,44| 27,37 3| 73,37| 26,63| 2825|| 0,00| 11,34| 15,95

Tested on kernel 4.4

https://bugzilla.kernel.org/show_bug.cgi?id=78111

--- Comment #13 from Alex mad_sam@bk.ru --- (In reply to Alex Deucher from comment #12)

Setting radeon.bapm=1 will enable it.

It works! Thank You.