It seems that the problem was solved with the release of 14.10. Adjust
the brightness works in a pure distribution when loaded from USB flash.
The bug can be closed.
** Changed in: linux (Ubuntu)
Status: Incomplete = Fix Released
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I too can confirm that on the same laptop. Also once i wake it up from
sleep and enter my password the screen goes blank. I need to repress the
power button and screen is back again. Should i install any drivers. I
am facing quiet a few screen issues.
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prathik, so your hardware may be tracked, could you please file a new report by
executing the following in a terminal while booted into a Ubuntu repository
kernel (not a mainline one) via:
ubuntu-bug linux
For more on this, please read the official Ubuntu documentation:
Ubuntu Bug Control and
** Changed in: linux (Baltix)
Importance: Medium = High
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Title:
[HP ProBook 4540s] brightness control problems
Status in
Probook 4540s with 12.04.3 3.8.0-29-generic x86_64 and
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Thames [Radeon HD 7550M/7570M/7650M]
and
** Tags added: needs-bisect needs-upstream-testing
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Title:
[HP ProBook 4540s] brightness control problems
Status in “linux”
i can confirm this on hp 4740s on 13.04,
tried last kernel 3.11 - problem still are, and wifi don't work.
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Title:
[HP ProBook
Bogdan Iavorskyi, if you have a bug in Ubuntu, the Ubuntu Kernel team, Ubuntu
Bug Control team, and Ubuntu Bug Squad would like you to please file a new
report by executing the following in a terminal while booted into a Ubuntu
repository kernel (not a mainline one) via:
ubuntu-bug linux
For
I can confirm this bug on several HP Probooks, including HP ProBook
4740s with Ubuntu 12.04.3 LTS (Precise) daily-live 2013-08-18 (from
http://cdimage.ubuntu.com/precise/), which has Linux kernel 3.8 (tested
with several linux-image-generic-lts-raring versions, including the
latest -
** Attachment added: backlight
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765939/+files/backlight
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** Attachment added: SSDT1.dat
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765947/+files/SSDT1.dat
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** Attachment added: fwts
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765944/+files/fwts
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Title:
** Attachment added: acpi
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765937/+files/acpi
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Title:
** Attachment added: DSDT.dat
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765942/+files/DSDT.dat
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** Attachment added: results.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765946/+files/results.log
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** Attachment added: dmidecode.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765940/+files/dmidecode.log
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** Attachment added: DSDT.dsl
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765943/+files/DSDT.dsl
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** Attachment added: acpidump.txt
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765938/+files/acpidump.txt
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** Attachment added: SSDT2.dat
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765949/+files/SSDT2.dat
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Problem gone with kernel parameter acpi_backlight=vendor. It works!
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Title:
[HP ProBook 4540s] brightness control problems
Status
** Attachment added: SSDT3.dat
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765950/+files/SSDT3.dat
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** Attachment added: version
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765952/+files/version
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** Attachment added: video
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1208257/+attachment/3765953/+files/video
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Title:
** Description changed:
I bought a laptop in December 2012, immediately tried to put Ubuntu
12.10, got broken wi-fi and non-working graphics acceleration. Updated
kernel to version 3.6, with graphic acceleration was all right, even
partially earned wi-fi. After some time wi-fi hang,
BondCreat, could you please provide the information following
https://wiki.ubuntu.com/Kernel/Debugging/Backlight ?
** Tags removed: regression-potential
** Tags added: regression-release
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** Changed in: linux (Ubuntu)
Importance: Undecided = Medium
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Title:
[HP ProBook 4540s] brightness control problems
Status in
In 3.11rc4 kernel Fn-F2 and Fn-F3 keys (brightness control) not working
at all, progress bar doesn't appear. Also wi-fi connection very
unstable.
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream-v3.11-rc4
** Changed in: linux (Ubuntu)
Status: Incomplete =
Christopher M. Penalver (penalvch), yes, in 12.10 all ok up to 3.6
kernel inc.
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Title:
[HP ProBook 4540s] brightness control
apport information
** Tags added: apport-collected raring
** Description changed:
I bought a laptop in December 2012, immediately tried to put Ubuntu
12.10, got broken wi-fi and non-working graphics acceleration. Updated
kernel to version 3.6, with graphic acceleration was all right, even
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Title:
HP ProBook 4540s brightness control problems
Status in
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