On Mon, Mar 4, 2013 at 3:16 PM, Chris Li <lkml at chrisli.org> wrote: >>> Two things to test: >>> - Can you please check whether any of the backlight drivers in >>> /sys/class/backlight does anything? You need to frob the brightness >>> file. Please also list all the drivers you have. This is the kernel with the ACPI change causing the black screen. lrwxrwxrwx. 1 root root 0 Mar 4 15:20 acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0 lrwxrwxrwx. 1 root root 0 Mar 4 15:20 acpi_video1 -> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1 lrwxrwxrwx. 1 root root 0 Mar 4 15:20 intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight Here is the interesting part. The brightness and max_brightness is all set to 4648, However, the actual brightness is 0. The bl_power is also 0. I think you are on to some thing. I attach the reg dump as intel-reg-bad. Chris -------------- next part -------------- A non-text attachment was scrubbed... Name: intel-reg-bad Type: application/octet-stream Size: 14954 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20130304/26841897/attachment.obj>
