New USB devices not recognized on T495 in battery mode #436
Comments
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Hi, you may isolate the cause by following the Troubleshooting Guide. My prime suspect would be the PCIe devices e.g. Runtime PM. |
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Thanks, it was indeed PCIe Runtime PM. I blacklisted the USB controllers with: and it works! |
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Would it make sense to mention this issue in the docs somewhere? This has caused me a lot of headaches but since I hadn't noticed it would only happen when running on battery my google searches never led me here... |
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@gsalgado : your wish is granted. Thanks for the hint. https://linrunner.de/tlp/faq/usb.html#newly-inserted-usb-devices-not-recognized-in-battery-mode |
Does this work on other Lenovo devices like IdeaPad? I am having the same issues if i turn on TLP, with usb auto suspend off, still usb doesn't work on battery |
Rationale: users report that USB devices are not recognized or do not work in battery mode. Workaround: exclude USB3 controllers from runtime pm. Additional power consumption on unaffected laptops should be negligible. References: * https://linrunner.de/tlp/faq/usb.html#faq-usb-not-working-on-battery * #436 * #587
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Hello, sorry to bump an old thread but this just bit me right now at a not-so-convenient time. I am on NixOS 23.11, and I think the commit above hasn't made it to me yet. Do you think its appropriate to suggest this config change as a sane-default till a new tlp release is out? I wouldn't mind opening a PR with my distro for this. |
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@SohamG Why don't you just add it to your configuration? |
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Oh i was just hoping to make a contribution so that others don't have this
issue. I've submitted packages there before so I know the workflow.
Soham Gumaste
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@SohamG <https://github.com/SohamG> Why don't you just add it to *your*
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@SohamG From an upstream support perspective, it is not very helpful when distributions prematurely include individual changes outside of releases. Then I don't know exactly what I'm dealing with in the issue tracker. If you want to contribute more extensively, then a NixOS package that reflects the HEAD of the main branch would be great. Something like this exists for Arch Linux: https://aur.archlinux.org/packages/tlp-git I should probably do another release ... |
Describe the bug
When my Thinkpad T495 runs on battery (or TLP is in manual battery mode, set with
tlp bat) and i plug in a new USB device, it does not get recognized. Also there is nothing visible inlsusborjournalctl/dmesg. The USB device only charges then, like on a simple power supply.Already connected devices keep working though, but they are also gone when shortly disconnected and reconnected, same as described above.
This only happens if all (external) USB devices are disconnected at some point. If at least one is kept connected all the time, then new devices (on other ports) show up and work fine.
USB autosuspend was enabled first, but it makes no difference when it is disabled (with
USB_AUTOSUSPEND=0).On AC everything works as expected, that is the only way how i can currently use USB, without disabling TLP completely.
All USB ports (USB-C 3.1, USB-A 3.0) on the laptop are affected.
To Reproduce
Full output of
tlp-statfor AC and battery:https://gist.github.com/Jakeler/5bbe260898e7920f99c689a954299b75
You can see that my Logitech mouse is missing in the battery stat (i replugged it to test it).
Looking over both with
icdiffshows that many PCIe device power controls change from on to auto. Maybe it has something to do with the PCIe USB controller going into sleep mode?The text was updated successfully, but these errors were encountered: