Red Hat Bugzilla – Bug 1028383
Dell XPS 13 L322X (Sputnik, FullHD) backlight is off
Last modified: 2014-06-11 10:15:16 EDT
Description of problem:
Backlight is off and not changeable.
Version-Release number of selected component (if applicable):
Fedora 20 Alpha (Updates until 2013-011-08), kernel-3.11.7-300.fc20
Steps to Reproduce:
1. install Fedora 20 Alpha (plugin external monitor and switch the monitor output with (FN + F1) to clone the display to external monitor (because the laptop-display is corrupted)
2. make updates until 2013-011-08 (kernel-3.11.7-300.fc20 or later should be installed)
3. reboot: -> the display should work without corruption, but backlight is off
2. try to control brightness of the backlight
backlight remains dark
backlight change the level of brightness
Dell XPS 13, L322X (Sputnik, FullHD),
Ubuntu 13.04 and Ubuntu 13.10 had the same problems,
search the web for more bug reports
the following commands are without success:
echo -n 0 > /sys/module/video/parameters/brightness_switch_enabled
The slider of the gnome brightness control is very choppy. So maybe it tries to set something, that require some time.
I have the same problem, with the same laptop
I think #903136 is related, looks like 3.12 fix the problems
I've been researching backlight issues for the last few days and I think I'm starting to get a handle on them, or at least to some degree.
Can you install with the latest fedora kernel:
(download the rpm for your arch, and install it with "rpm -ivh kernel...rpm") ?
And boot it with "video.use_native_backlight=1" on the kernel cmdline
(press esc at the grub screen to stop grub from booting, then e to edit the entry for the latest kernel, then go the line starting with linux, and add the end of that line add a space and then ideo.use_native_backlight=1), then press F10 to boot.
Once booted check if the brightness control now works properly, also please run the following 2 commands:
grep '.*' /sys/class/dmi/id/*_* 2> /dev/null
And copy and paste the output here.
I've just learned that this should be fixed in 3.15-rc3 and later, see:
Can you please try installing this kernel:
And see if that fixes things ?
So as mentioned in comment 5, I'm pretty sure that this is:
Which has a patch attached for 3.14 stable too, perhaps we should at that patch to the Fedora kernels until it trickles down through stable ?
I don't have access to this Dell Laptop at this time. This Laptop is owned by a friend and he removed Ubuntu and Fedora and only Win 8 is installed :-(
So a new Fedora install is at the moment impossable.
With a live system (USB stick) it seems not possible to try this? I had to boot a live system, install the patch and then I must reboot. But the reboot is impossable with a live system :-(
(In reply to Rolle from comment #7)
> I don't have access to this Dell Laptop at this time. This Laptop is owned
> by a friend and he removed Ubuntu and Fedora and only Win 8 is installed :-(
> So a new Fedora install is at the moment impossable.
> With a live system (USB stick) it seems not possible to try this? I had to
> boot a live system, install the patch and then I must reboot. But the reboot
> is impossable with a live system :-(
No problem, there was a known bug with XPS machines backlight which has been fixed upstream and in the Fedora kernels for a while now. I'm pretty sure that this is fixed now, so lets just close this bug.
Thanks for your support / help with solving this!