On Sunday, 23 of December 2007, Andrew Morton wrote: > > When I fire up the latest Linus tree on my thinkpad t61p I get: > > thinkpad_acpi: ThinkPad ACPI Extras v0.17 > thinkpad_acpi: http://ibm-acpi.sf.net/ > thinkpad_acpi: ThinkPad BIOS 7LET44WW (1.14 ), EC 7KHT22WW-1.06 > thinkpad_acpi: Lenovo ThinkPad T61p > thinkpad_acpi: radio switch found; radios are enabled > ACPI: Lid Switch [LID] > input: Sleep Button (CM) as /class/input/input6 > ACPI: Sleep Button (CM) [SLPB] > thinkpad_acpi: standard ACPI backlight interface available, not loading native one... > > > > and /sys/class/backlight/thinkpad_screen/brightness is no longer present, so > my `brightness' script no longer works. That, my friends, is a regression. > > Here's my script: > > ( > 0 sh -c "echo $1 > /proc/acpi/sony/brightness" > 0 sh -c "echo $1 > /proc/acpi/sony/brightness_default" > 0 sh -c "echo $1 > /sys/class/backlight/sony/brightness" > 0 sh -c "echo $1 > /sys/class/backlight/thinkpad_screen/brightness" > ) 2>/dev/null > > which rather shows how pathetic we are in this area. Ho hum. > > > So I go hunting around and find > > /sys/class/backlight/acpi_video0/ > and > /sys/class/backlight/acpi_video1/ > > Why are there two of them? > > > Both of these have a `brightness' entry which has contents of 100. When I set > that to 10, the screen's brightness is not reduced. > > So as far as I can tell, we have lost the ability to alter the brightness of > the screen on this machine. FYI, I have created a bugzilla entry for this issue at: http://bugzilla.kernel.org/show_bug.cgi?id=9625 and added it to the list of known recent regressions. Thanks, Rafael - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
