I confirm this bug on ThinkPad X201. I don't remember the Ubuntu
version.
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https://bugs.launchpad.net/bugs/1291371
Title:
thinkpad screen dims after unplugging external
I'm using 14.04 on an HP ProBook 6460b.
I have the same issue.
It used to dim the laptop screen when the monitor is unplugged. Then
plugging it in again and removing it brought the controls back.
As of today, even plugging the screen multiple times is not bringing
back the controls. I really
FYI, I can confirm this on a Clevo W230SS. (It has both an nvidia an
Intel chipset, but I keep it in Intel-only mode.) Let me know if I can
do anything to assist.
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I can also confirm this on a ThinkPad T540p with stock kernel
(3.13.0-generic), and that the workaround is to drop into a console to
adjust brightness and then go back to X.
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I also confirm it on a thinkpad x230 with stock kernels since 14.04.
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https://bugs.launchpad.net/bugs/1291371
Title:
thinkpad screen dims after unplugging external
I confirm it on a thinkpad x230 with stock kernels since 14.04. I
reattach the external monitor then detach again which seems to
consistently return the brightness controls to a working state.
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I also confirm that problem continue to exists for Ubuntu 14.04 using th
standard Linux X1 3.13.0-30-generic #54-Ubuntu SMP Mon Jun 9 22:45:01
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux kernel.
The way around it is to go the console, adjust the brightness to desired
level, then go back to X.
** Description changed:
When I un-plug the external VGA cable from my Thinkpad X200s, the screen
dims. Hitting Fn-Home (the brightness-increase key) does nothing.
Suspending and resuming doesn't reset this, though a reboot will allow
me to use the brightness controls again while in the
i face same problem with thinkpad T430U using same work around of Ctrl+alt+ f1
to increase brightness and back with ctrl+alt+f7
the brightness controls are non responsive
i am running ubuntu 14.04 LTS. however my kernel is also 3.13.
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Yes, sorry. The test should have read the 3.14 kernel.
** Changed in: linux (Ubuntu)
Status: Confirmed = Triaged
** Tags added: needs-bisect
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Joseph, your text says the latest v3.13 kernel, but the link takes me to
v3.14. Is that correct?
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https://bugs.launchpad.net/bugs/1291371
Title:
thinkpad screen dims
Linux vezza 3.14.0-031400rc6-generic #201403100035 SMP Mon Mar 10
04:36:54 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
The bug seems to be fixed with this kernel.
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
** Tags added: kernel-fixed-upstream
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This sounds more like a kernel issue (ACPI maybe?) as Compiz has nothing
to do with screen brightness and screen brightness hot keys.
** Package changed: compiz (Ubuntu) = linux (Ubuntu)
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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.13 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
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