On 2010-11-02 08:20, Michel D?nzer wrote: > 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.
I've sent the full logs on Nov 2nd. Did they arrive? Did they provide any insight? Anything else I can do / try / provide? Many thanks in advance for your help! -- Prof. Dr. Klaus Kusche Private address: Rainstra?e 9/1, 88316 Isny, Germany +49 7562 6211377 Klaus.Kusche at computerix.info http://www.computerix.info Office address: NTA Isny gGmbH, Seidenstra?e 12-35, 88316 Isny, Germany +49 7562 9707 36 kusche at nta-isny.de http://www.nta-isny.de
