*** This bug is a duplicate of bug 415023 ***
https://bugs.launchpad.net/bugs/415023
Public bug reported:
TL;DR: Whenever the screen tries to dpms off/standby/shutdown,
brightness change key events are generated, simulating activity and
instantly waking it. This is on an Advent 4211 netbook (rebranded MSI
Wind U100), running 2.6.31-14-generic on Kubuntu 9.10 x86.
- Background:
Whenever the brightness changes, both the hardware/kernel and the software
seems to generate a keypress, which in turn triggers a brightness change each
and causes them to race. This is tightly related to bug #435352, where the
solution so far has been to make changes to the HAL .fdi file for laptop
screens to properly signal this by enabling the property
laptop_panel.brightness_in_hardware on known affected laptop screens, and then
change the the software (here power managers; Powerdevil, gnome-power,
xfce4-power-manager, ...) to be aware of the property and to largely back off
brightness handling.
When the screen tries to DPMS off/standby/shutdown, both xev and dbus-
monitor report brightness key events (xev one brightness down key
release, dbus-monitor three up/down keypress events), and the screen
promptly wakes. If the power manager (here Powerdevil) is set to let the
screen sleep after a period of inactivity, this phantom activity will
reset the cycle.
KeyRelease event, serial 34, synthetic NO, window 0x3600001,
root 0xf9, subw 0x0, time 271798228, (55,-14), root:(59,11),
state 0x0, keycode 232 (keysym 0x1008ff03, XF86MonBrightnessDown),
same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
Asking Felix Geyer (debfx) whether Powerdevil could be told to ignore the event;
[18:21] <debfx> there is nothing powerdevil can do to prevent key events
[18:23] <debfx> hmm well yeah it could probably ignore them
[18:23] <debfx> i'll have a look at the code
[18:38] <debfx> doesn't seem that easy, by default powerdevil uses the
xsync extension to get notified on user activity
As it happens, this is a netbook (Advent 4211, a rebranded MSI Wind
U100), so thankfully I can close the lid. But the screen will never
otherwise sleep.
ProblemType: Bug
AplayDevices:
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC1200 Analog [ALC1200 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: zorael 5629 F.... knotify4
zorael 5648 F.... kmix
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xffe00000 irq 16'
Mixer name : 'Realtek ALC1200'
Components : 'HDA:10ec0888,14620110,00100101'
Controls : 22
Simple ctrls : 14
Date: Sun Nov 15 15:27:45 2009
DistroRelease: Ubuntu 9.10
HibernationDevice: RESUME=UUID=271467da-45c3-4047-b445-19929c58ab91
MachineType: MICRO-STAR INTERNATIONAL CO., LTD U-100
Package: linux-image-2.6.31-14-generic 2.6.31-14.48
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-14-generic
root=UUID=3970f499-b9ea-47af-9c60-2080e8e229ce ro quiet splash
ProcEnviron:
LANGUAGE=
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
linux-backports-modules-2.6.31-14-generic N/A
linux-firmware 1.24
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
Uname: Linux 2.6.31-14-generic i686
dmi.bios.date: 10/06/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.3
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: U-100
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.board.version: Ver.001
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO., LTD
dmi.chassis.version: Ver.001
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr4.6.3:bd10/06/2008:svnMICRO-STARINTERNATIONALCO.,LTD:pnU-100:pvrVer.001:rvnMICRO-STARINTERNATIONALCO.,LTD:rnU-100:rvrVer.001:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvrVer.001:
dmi.product.name: U-100
dmi.product.version: Ver.001
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO., LTD
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
Screen can't dpms off/standby/shutdown, wakes instantly
https://bugs.launchpad.net/bugs/483116
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