Hi, recently I installed Debian 8.2 on my Lenovo ThinkPad X230, model 23202TG and found that brightness control keys does not work anymore. In the system logs I found this messages, related to brightness control
kernel: thinkpad_acpi: ThinkPad ACPI Extras v0.25 kernel: thinkpad_acpi: http://ibm-acpi.sf.net/ kernel: thinkpad_acpi: ThinkPad BIOS G2ETA4WW (2.64 ), EC unknown kernel: thinkpad_acpi: Lenovo ThinkPad X230, model 23202TG kernel: thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@lists.sourceforge.net kernel: thinkpad_acpi: radio switch found; radios are enabled kernel: thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver kernel: thinkpad_acpi: Disabling thinkpad-acpi brightness events by default... I also tried to add "acpi_backlight=vendor" to kernel boot parameters, as suggested at ThinkWiki [0] but this does not help. In both cases there is an /sys/class/backlight/intel_backlight/ entry in the sysfs which reports max_brightness equal to 4438. But the only way to change current brightness is to "echo" some value manually. I tested with standard 3.16 kernel and 4.2.3 kernel from backports repository. Previously I used Slackware64 14.0 with 3.10 kernel and brightness keys worked as expected out of the box. Any ideas how to fix this? If necessary I will be happy to provide any required information and perform tests. Thanks and sorry for my English. [0] http://www.thinkwiki.org/wiki/Installing_Debian_on_an_X230#Brightness Alex -- реклама ----------------------------------------------------------- Купуй дешевше на Aukro.ua! Розпродаж! http://h.holder.com.ua/c?tz&z1585&b107358&s03908&r[rndID]&u ------------------------------------------------------------------------------ _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
