A recent update of thermald 1.9.1-1ubuntu0.5 in focal contains many of
the upstream thermald patches that have been backported to support more
modern laptops.
The Intel fixes included are as follows:
- Disable legacy rapl cdev when rapl-mmio is in use
This will prevent PL1/PL2 power limit from MSR based rapl, which
may not be the correct one.
- Delete all trips from zones before psvt install
Initially zones has all the trips from sysfs, which may have wrong
settings. Instead of deleting only for matched psvt zones, delete
or all zones. In this way only zones which are in PSVT will be
present.
- Check for alternate names for B0D4 device
B0D4 can be named as TCPU or B0D4. So search for both names
if failed to find one.
- Fix error for condition names
The current code caps the max name as the last condition name,
which is "Power_Slider". So any condition more than 56 will be
printing error, with "Power_Slider" as condition name. For example
for condition = 57: Unsupported condition 57 (Power_slider)
- Set a very high RAPL MSR PL1 with --adaptive
After upgrading Dell Latitude 5420, again noticed performance
degradation.
The PPCC power limit for MSR RAPL PL1 is reduced to 15W. Even though
we disable MSR RAPL with --adaptive option, it is not getting
disabled. So MSR RAPL limits still playing role.
To fix that set a very high MSR RAPL PL1 limit so that it never
causes throttling. All throttling with --adaptive option is done
using RAPL-MMIO.
- Special case for default PSVT
When there are no adaptive tables and only one default PSVT table
is present with just one entry with MAX type. Add one additional
entry as done for non default case.
- Increase power limit for disabled RAPL-MMIO
Increase 100W to 200W as some desktop platform already have limit
more than 100W.
- Use Adaptive PPCC limits for RAPL MMIO
Set the correct device name as RAPL-MSR so that RAPL-MMIO can
also set the correct default power limits.
Can folk check if this helps with the issue?
** Changed in: thermald (Ubuntu)
Importance: Undecided => High
** Changed in: thermald (Ubuntu)
Assignee: (unassigned) => Colin Ian King (colin-king)
** Changed in: thermald (Ubuntu)
Status: Confirmed => Incomplete
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Packages, which is subscribed to thermald in Ubuntu.
https://bugs.launchpad.net/bugs/1763144
Title:
Significantly lower power and thermal limits on ThinkPad T480s (and
probably others) than on Windows
Status in linux package in Ubuntu:
Invalid
Status in thermald package in Ubuntu:
Incomplete
Bug description:
A ThinkPad T480s under windows has a power limit of 44W, both short
and long term, with a thermal maximum of about 93C or so. Under Linux,
the power limits are 44W and 15W (short) or so, and the thermal limit
is 80C, causing a significant performance loss.
Looking at MSR and MCHBAR values, we can see that the values are
correctly at 44W in the MSR, but the MCHBAR is set to a lower value:
$ sudo rdmsr -a 0x610
42816000dd8160
42816000dd8160
42816000dd8160
42816000dd8160
42816000dd8160
42816000dd8160
42816000dd8160
42816000dd8160
$ sudo /home/jak/Downloads/iotools-1.5/iotools mmio_read64 0xfed159a0
0x0042816000dd8078
Setting the MCHBAR to the same value as the MSR register solves the problem.
At some point intel-rapl seems to reduce overall frequency to 600 MHz, though.
The thermal limit is configured in MSR register 0x1a2; rdmsr -f 29:24
-d 0x1a2 returns 20. Setting those bits to 7 increases it, resulting
in performance comparative to Windows.
Most of the analysis is based on the analysis in
https://www.reddit.com/r/thinkpad/comments/870u0a/t480s_linux_throttling_bug/
This applies to all bionic kernels I have tested so far, including
Ubuntu 4.15.0-13.14-generic 4.15.10
---
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC2D0p: jak 5881 F...m pulseaudio
/dev/snd/controlC2: jak 5881 F.... pulseaudio
/dev/snd/controlC1: jak 5881 F.... pulseaudio
/dev/snd/controlC0: jak 5881 F.... pulseaudio
CurrentDesktop: GNOME
DistroRelease: Ubuntu 18.04
InstallationDate: Installed on 2018-03-14 (28 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180313)
MachineType: LENOVO 20L8S02D00
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: root=/dev/mapper/ubuntu--vg-root ro rootflags=subvol=@
quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
RelatedPackageVersions:
linux-restricted-modules-4.15.0-13-generic N/A
linux-backports-modules-4.15.0-13-generic N/A
linux-firmware 1.173
Tags: bionic
Uname: Linux 4.15.0-13-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip kvm lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 01/22/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N22ET31W (1.08 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20L8S02D00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN22ET31W(1.08):bd01/22/2018:svnLENOVO:pn20L8S02D00:pvrThinkPadT480s:rvnLENOVO:rn20L8S02D00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T480s
dmi.product.name: 20L8S02D00
dmi.product.version: ThinkPad T480s
dmi.sys.vendor: LENOVO
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