Same for me, I notice this problem on my Kubuntu 17.10, kernel
4.13.0-46-generic.
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https://bugs.launchpad.net/bugs/1389077
Title:
[HP ProBook 4530s / Lenovo G580] Intel Powerclamp is Sl
I see this also in Kubuntu 18.04 (all updates installed)
Also Alt+F4 etc is doing the same (except for Alt+F1 which).
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https://bugs.launchpad.net/bugs/520546
Title:
Alt-f2 switches to
... additional info to my previous comment:
after enabling "Load Legacy Option Rom" in BIOS, backlight is working ok
(also when I use f4/f5 keys).
Bios version A08, model XPS L322X
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The same for me, xps13, full hd, booting from UEFI. Working well with
previous kernel version (3.8.0-29-generic). After updating to the latest
(3.8.0-30-generic) the problem is back again.
martin@flegy-nb:~$ uname -a
Linux flegy-nb 3.8.0-30-generic #44-Ubuntu SMP Thu Aug 22 20:52:24 UTC 2013
x86_
