Hi folks,
I have a bug report for a Lenovo T440s. I know the "unsupported
brightness interface" has been reported numerous times, but from an end
user perspective I have two issues:
1. once I 'logon' to the Linux desktop and the X display starts (i.e.
after the gnome logon screen) the brightness is set such that the
display is blank, and I have to use the brightness keys (i.e in the
T440s case F8) to increase the brightness to I can see the desktop.
2. If I have a second monitor plugged in the display stays blank and I
can't even see the gnome logon display screen at all.
Feb 19 14:23:25 Bosendorfer kernel: [ 7.543808] thinkpad_acpi:
ThinkPad ACPI Extras v0.25
Feb 19 14:23:25 Bosendorfer kernel: [ 7.543810] thinkpad_acpi:
http://ibm-acpi.sf.net/
Feb 19 14:23:25 Bosendorfer kernel: [ 7.543811] thinkpad_acpi:
ThinkPad BIOS GJET77WW (2.27 ), EC unknown
Feb 19 14:23:25 Bosendorfer kernel: [ 7.543813] thinkpad_acpi: Lenovo
ThinkPad T440s, model 20AQCTO1WW
Feb 19 14:23:25 Bosendorfer kernel: [ 7.544300] thinkpad_acpi:
Unsupported brightness interface, please contact
ibm-acpi-devel@lists.sourceforge.net
Feb 19 14:23:25 Bosendorfer kernel: [ 7.544371] thinkpad_acpi: radio
switch found; radios are enabled
Feb 19 14:23:25 Bosendorfer kernel: [ 7.544430] thinkpad_acpi: This
ThinkPad has standard ACPI backlight brightness control, supported by
the ACPI video driver
Feb 19 14:23:25 Bosendorfer kernel: [ 7.544431] thinkpad_acpi:
Disabling thinkpad-acpi brightness events by default...
Feb 19 14:23:25 Bosendorfer kernel: [ 7.545366] thinkpad_acpi: rfkill
switch tpacpi_bluetooth_sw: radio is unblocked
Feb 19 14:23:25 Bosendorfer kernel: [ 7.545690] thinkpad_acpi:
Console audio control enabled, mode: monitor (read only)
Feb 19 14:23:25 Bosendorfer kernel: [ 7.546796] input: ThinkPad Extra
Buttons as /devices/platform/thinkpad_acpi/input/input9
I am running Debian Jessie (testing)
Linux Bosendorfer 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt4-3
(2015-02-03) x86_64 GNU/Linux
/proc/acpi/ibm/driver
driver: ThinkPad ACPI Extras
version: 0.25
Hope this is the correct place to report this,
In response to some of the reports the replies are that "Unsupported
brightness interface, " is a normal message and can be ignored,
and unlike some others who have reported, my F5,F6 keys to adjust the
brightness do work (although I think they were running experimental),
so I'm at a bit of a loss as to what I can do to fix this, the second
display 'startup' issue is the real nuisance - I have to remember to
unplug the display when (re)booting.
regards,
Jol.
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