Public bug reported:
The symptoms reported with
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/451282 persist.
After resuming from sudpend the display returns fully dimmed, and
display brightness can't be adjusted, neither using FN keys, nor using
KDE power management control.
The issue occurs regardless whether the supend state was activated by
low battery, by closing the display, or by explicitly selecting sleep
mode in KDE.
Killing and restarting X does not solve the problem. A reboot does.
Notebook: HP 8530w, Quadro FX 770M, Nouveau driver. Details:
# dpkg -l xserver-xorg-video-nouveau
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture
Description
+++-==============================-====================-====================-==================================================================
ii xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 amd64
X.Org X server -- Nouveau display driver
# lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04
# cat /proc/version_signature
Ubuntu 3.13.0-39.66-generic 3.13.11.8
>From lspci -vnvn:
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation G96GLM [Quadro FX
770M] [10de:065c] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device [103c:30e7]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 46
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1390764
Title:
Display remains fully dimmed after resume from suspend
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