T430 brightness control question....

It seems that no matter what Power Plan I choose.... the screen brightness goes to a very dim level while in battery mode. Even after a "Custom" plan, it forgets the desired brightness level after a re-boot.
Any advice would be appriciated.... Thank you
The BIOS and all the drivers are up to date....

Hi Stealth,
Welcome to Lenovo Community!
As per the query we understood that you are facing an issue with Brightness on your ThinkPad T430.
Please check with disabling battery stretch from Lenovo power manager application.
Click here to view the procedure on disabling battery stretch settings.
Hope this helps!
Best regards,
Hemanth Kumar
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Last edited by orschiro (2013-03-01 15:29:02)

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[SOLVED] Thinkpad T430 brightness keys broken after firmware upgrade

Hi.
I've upgraded the firmware on my Thinkpad to version 2.51. Since that I'm unable to change the display brightness via the Fn-Keys on the keyboard. What still works is writing values to /sys/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0/brightness but of course that's not how it should be.
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[ 7.638814] thinkpad_acpi: ThinkPad ACPI Extras v0.24
[ 7.638816] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 7.638817] thinkpad_acpi: ThinkPad BIOS G1ET91WW (2.51 ), EC unknown
[ 7.638818] thinkpad_acpi: Lenovo ThinkPad T430, model 2349D15
[ 7.639440] thinkpad_acpi: detected a 8-level brightness capable ThinkPad
[ 7.639547] thinkpad_acpi: radio switch found; radios are enabled
[ 7.639558] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
[ 7.639559] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
[ 7.640708] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
[ 7.641012] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[ 7.641156] thinkpad_acpi: Console audio control enabled, mode: monitor (read only)
Any idea why it's broken and how it can be fixed?
Thanks,
Julian
Last edited by julian24 (2013-03-21 22:06:20)

Awesome, the acpi_backlight=vendor kernel command line parameter actually fixed it.
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Last edited by julian24 (2013-03-21 23:27:47)

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