Eee Top, intel driver: backlight off

Zhenyu Wang at
Tue Dec 2 22:04:22 PST 2008

On 2008.11.28 06:01:20 +0800, Uplink wrote:
> Hello everyone,
> I recently received two shiny Asus Eee Top ET1602 units to play with. I
> am to run Linux on them, and pretend that the Windows XP Home that came
> with them is not there. But I have a problem... the LCD backlight is
> turned off when X starts with the intel driver.
> I use Ubuntu 8.10 (intel driver 2.4.1, libdrm 2.3.1, kernel 2.6.27). As
> soon as X starts, the backlight turns off and there's no way to turn it
> back on while X is on display. Switching to a console turns the
> backlight on, switching back to X turns it off again.
> The display is connected on the LVDS connector (according to the Windows
> video driver), but when I run "xrandr --properties" there's something
> wrong there: the range for the BACKLIGHT priperty is (0,0). I tried
> switching the BACKLIGHT_CONTROL property to different values (starts
> with 'native'), but to no avail. I hacked the drivers so the range
> matches that of my laptop, which is (0,10781) in "combination" mode, but
> still no effect on the backlight.
> The "vesa" driver works fine. Even more, the touch screen works with the
> evtouch driver without much hassle:
> . All that's missing is
> the actual picture.
> I tried the 2.5.1 driver from Debian experimental (without upgrading any
> drm kernel modules though) and I got the same result.
> At this point, I gave up on researching it on my own. Can someone help
> me fix the backlight controls for this machine?

Xorg.0.log with ModeDebug option on is required to see what's display config
of this hardware. Please file a bug to

Open Source Technology Center, Intel ltd.

$gpg --keyserver --recv-keys 4D781827
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