Comment 0 for bug 1390764

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