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I'm using the Fluxbox window manager on Ubuntu 12.04. I recently got my desktop into a strange situation, and I'm not sure how! The situation was this:

  • If I close the laptop screen lid and then re-open it, brightness is greatly reduced.

  • If I run pm-suspend and then wake the machine, brightness goes back to full!

So I have a rather inconvenient way to control my brightness, but I wonder if there might be a better way?!

But I'm not actually sure what caused my machine to get into this state to begin with! (I initially thought it was from running gnome-settings-daemon but I haven't been able to reproduce it since rebooting.)

I'm running Ubuntu 12.04 with a 3.5.0 kernel. (Because I've had trouble getting later kernels, and Ubuntu 14 and 15, to boot or run well.)

I have tried other tips on this site, but none of them worked.

  • xbacklight -get responds with exit code 0 but no data. -inc and -dec do nothing.

  • find /sys/ | grep brightness gives me:

    /sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0/brightness
/sys/devices/pci0000:00/0000:00:1c.1/0000:02:00.0/leds/ath9k-phy0/max_brightness
/sys/module/i915/parameters/invert_brightness
/sys/module/video/parameters/brightness_autoswitch_via_bios
/sys/module/video/parameters/brightness_switch_enabled

    but poking values into those files did nothing.

  • And likewise for find /sys/ | grep backlight

    /sys/class/backlight     (empty folder)
/sys/module/video/parameters/use_bios_initial_backlight

  • xrandr did nothing with -gamma or -brightness. (I am running a generic graphics driver with no acceleration: "Mesa Project and SGI" / .../drivers/gpu/drm/i915/i915.ko)

  • I do have the kernel module i915 530857 0 but Oleph's script didn't help.

  • I tried the indicator-brightness package to no avail.

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joeytwiddle
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