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Massimo B.
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Joined: 09 Feb 2005
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Location: PB, Germany
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 Posted: Fri Jul 05, 2019 7:24 am Post subject: [kernel] switching from power state: |
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What is the kernel doing there, why and when?
So far I just know pstate for the core-i archs, and intel-undervolting for kind of power management.
There is no laptop_tools involved on that desktop system.
| Code: | Jul 05 06:42:36 [kernel] switching from power state:
Jul 05 06:42:36 [kernel] _ui class: performance
Jul 05 06:42:36 [kernel] _internal class: none
Jul 05 06:42:36 [kernel] _caps:
Jul 05 06:42:36 [kernel] _uvd vclk: 0 dclk: 0
Jul 05 06:42:36 [kernel] __power level 0 sclk: 40000 mclk: 80000 vddc: 900 vddci: 0
Jul 05 06:42:36 [kernel] __power level 1 sclk: 40000 mclk: 80000 vddc: 900 vddci: 0
Jul 05 06:42:36 [kernel] __power level 2 sclk: 77500 mclk: 90000 vddc: 1075 vddci: 0
Jul 05 06:42:36 [kernel] _status: c r
Jul 05 06:42:36 [kernel] switching to power state:
Jul 05 06:42:36 [kernel] _ui class: performance
Jul 05 06:42:36 [kernel] _internal class: none
Jul 05 06:42:36 [kernel] _caps:
Jul 05 06:42:36 [kernel] _uvd vclk: 0 dclk: 0
Jul 05 06:42:36 [kernel] __power level 0 sclk: 40000 mclk: 80000 vddc: 900 vddci: 0
Jul 05 06:42:36 [kernel] __power level 1 sclk: 40000 mclk: 80000 vddc: 900 vddci: 0
Jul 05 06:42:36 [kernel] __power level 2 sclk: 77500 mclk: 90000 vddc: 1075 vddci: 0
Jul 05 06:42:36 [kernel] _status: c r |
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Ant P.
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Joined: 18 Apr 2009
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| Posted: Fri Jul 05, 2019 8:48 am Post subject: |
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| That's your radeon, not your CPU. |
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Massimo B.
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Location: PB, Germany
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| Posted: Fri Jul 05, 2019 9:40 am Post subject: |
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Interesting, no word about the radeon in those lines. What does it do? I'm starting my kernel with the parameter radeon.dpm=1 but I guess this is the default behaviour anyway.
Is Power Management causing this power state switching? But it is always switching from performance to performance? I've never seen any other power state in my logs.
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Massimo B.
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Posts: 1838
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| Posted: Fri Jul 12, 2019 5:37 am Post subject: |
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How can this be set to powersave for instance?
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Massimo B.
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Joined: 09 Feb 2005
Posts: 1838
Location: PB, Germany
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| Posted: Wed Jul 17, 2019 6:21 am Post subject: |
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| Code: | # lsmod |grep radeon
radeon 1204224 34
i2c_algo_bit 12288 2 radeon,i915
drm_kms_helper 114688 2 radeon,i915
ttm 65536 1 radeon
drm 249856 14 drm_kms_helper,radeon,i915,ttm
# lspci |grep -e VGA -e Display
00:02.0 Display controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] |
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xdarma
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Joined: 08 Dec 2003
Posts: 720
Location: tra veneto e friuli (italy)
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| Posted: Wed Jul 17, 2019 9:40 am Post subject: |
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| Massimo B. wrote: | | How can this be set to powersave for instance? |
I don't use radeon driver, but there are some hints on wiki page like this:
| Code: | | root #echo "low" > /sys/class/drm/card0/device/power_profile |
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Massimo B.
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| Posted: Wed Jul 17, 2019 2:41 pm Post subject: |
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I learned that setting radeon.dpm=1 does set it to verbose while the default is already dpm=1. So I drop that kernel arg to avoid the messages..
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Kernel & Hardware
