I can confirm that https://bugzilla.kernel.org/attachment.cgi?id=97751
fixes the issue on the FHD version (also works after suspend and blank
screen). I've attached the patch rebased on top of 3.8.0-26.38 in case
somebody is eager to try it too.
** Patch added: "The patch for the FHD version from the kernel bugzilla,
rebased on top of 3.8.0-26.38"
https://bugs.launchpad.net/dell-sputnik/+bug/1169376/+attachment/3741292/+files/dell-xps13-fhd-backlight-fix.patch
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https://bugs.launchpad.net/bugs/1169376
Title:
XPS13 backlight stopped working after update 3.8.0-18.28
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