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Bug 510294 - backlight is set to minimum
Summary: backlight is set to minimum
Status: RESOLVED INVALID
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Unspecified (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Linux bug wranglers
URL:
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Keywords:
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Blocks:
 
Reported: 2014-05-14 08:55 UTC by Anton Gubarkov
Modified: 2014-05-14 11:58 UTC (History)
0 users

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Runtime testing required: ---

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Description Anton Gubarkov 2014-05-14 08:55:36 UTC 
some process/driver keeps switching backlight to minimal value in my new Lenovo Thinkpad T540p.

I was able to link it to the following sequence in the log:

May 14 12:53:51 r9-008cln kernel: thinkpad_acpi: EC reports that Thermal Table has changed
May 14 12:53:51 r9-008cln logger[3251]: ACPI event unhandled: ibm/hotkey LEN0068:00 00000080 00006030
May 14 12:53:51 r9-008cln logger[3253]: ACPI event unhandled: thermal_zone LNXTHERM:00 00000081 00000000
May 14 12:53:51 r9-008cln logger[3255]: ACPI event unhandled: battery PNP0C0A:00 00000080 00000001
May 14 12:53:52 r9-008cln logger[3261]: ACPI event unhandled: ac_adapter ACPI0003:00 00000080 00000001
May 14 12:53:52 r9-008cln kernel: thinkpad_ec: thinkpad_ec_request_row: arg0 rejected: (0x01:0x00)->0x00
May 14 12:53:52 r9-008cln kernel: thinkpad_ec: thinkpad_ec_read_row: failed requesting row: (0x01:0x00)->0xfffffffb
May 14 12:53:52 r9-008cln kernel: thinkpad_ec: initial ec test failed
May 14 12:53:52 r9-008cln kernel: thinkpad_acpi: EC reports that Thermal Table has changed
May 14 12:53:52 r9-008cln logger[3336]: ACPI event unhandled: ibm/hotkey LEN0068:00 00000080 00006030
May 14 12:53:52 r9-008cln logger[3338]: ACPI event unhandled: thermal_zone LNXTHERM:00 00000081 00000000
May 14 12:53:52 r9-008cln logger[3340]: ACPI event unhandled: battery PNP0C0A:00 00000080 00000001

It happens every time. correlation is 1:1
However I can't track it further, I need assistance in the direction I should poke....
Comment 1 Anton Gubarkov 2014-05-14 08:56:55 UTC 
I should mention, that it happens quite often and it is annoying - from several times per minute to 1 time in 5 minutes.
Comment 2 Anton Gubarkov 2014-05-14 09:57:56 UTC 
This happens when the notebook runs on AC and the main battery is fully charged
Comment 3 Alex Legler (RETIRED) archtester gentoo-dev Security 2014-05-14 11:58:39 UTC 
Please consult our support venues (Forums, IRC, Mailing Lists) to get help for your issue. Once you have actually identified a bug in a software component, you can post it here.