On Mon, 2010-11-01 at 16:09 +0100, Prof. Dr. Klaus Kusche wrote: > On my Dell Precision M6500, backlight power switching does not work, > neither by using bl_power in /sys/backlight/... Please provide the full path of the file you're using. > nor by using DPMS: > * Any changes of bl_power are simply and silently ignored > (no effect, except that brightness is set to minimum), > although brightness tuning works fine > (in other words: Both the generic ACPI BIOS driver and the in-kernel > Dell laptop backlight driver can control backlight brightness, > but not backlight power). > * If DPMS becomes active, the screen contents on the internal display > slowly becomes garbled or fades away (so video output drivers > seem to be off), but the backlight remains on > (which is very bad for battery power). > The external screen (on display port) behaves even worse: > It enters energy saving mode (backlight off) and immediately wakes up > again, continuously cycling the backlight power every few seconds. > > Another problem which optically looks the same: > Zapping the X server (Xorg 1.9.1, radeon 6.13.2) with Ctrl-Alt-Bksp > leaves the system in an undefined state: > * Similar to DPMS, the display fades away or gets garbled > (video output off), but the backlight remains on. > * It does not switch to the text console automatically, > nor is it possible to switch manually with Ctrl-Alt-Fn. > > Configuration: > * Kernel 2.6.35.7-grsec > * Radeon DRM with KMS > * Radeon framebuffer with backlight control enabled > * The Radeon chip is a JUNIPER 0x1002:0x68A0, > the kernel should contain all the microcode needed for it. > * The displays are LCD1: INTERNAL_UNIPHY and DFP1: INTERNAL_UNIPHY1 Please provide the full Xorg.0.log file and dmesg output. -- Earthling Michel DÃnzer | http://www.vmware.com Libre software enthusiast | Debian, X and DRI developer _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
