[gm45] Graphic slow after laptop display turned off

[Martin Wildam]

Binary package hint: xorg

When I leave the laptop and turn back when screen got black (blanked by laptop bios and not by screensaver) moving the mouse or pressing a key to wake it up, I can see graphics is very slow (switching between windows, changing desktop etc).

Steps to reproduce:
1. Disable screensaver
2. Wait until screen becomes dark
3. Move the mouse or press a key

Graphic performance is slow and Xorg consumes a notable amount of processor time.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic-pae 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic-pae i686
Architecture: i386
Date: Tue Jan 25 18:31:18 2011
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. Latitude E5500
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-27-generic-pae root=UUID=0c5230d6-05d2-47c8-9325-347fe42d71f9 ro quiet splash
ProcEnviron:
 LC_TIME=en_DK.utf8
 LANGUAGE=en
 PATH=(custom, no user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: xorg
XorgConf:
 Section "Monitor"
        Identifier "TV1"
        Option "Ignore" "True"
 EndSection
dmi.bios.date: 04/15/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0DW634
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd04/15/2009:svnDellInc.:pnLatitudeE5500:pvr:rvnDellInc.:rn0DW634:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Latitude E5500
dmi.sys.vendor: Dell Inc.
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-27-generic-pae

[lspci]
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
     Subsystem: Dell Device [1028:0263]

[Martin Wildam (mwildam)]

Calling xrandr does not help (there was another bug where that helped after reactivating screen with screensaver enabled).

This problem did not occur before the last (recently releasted) xorg update - or maybe kernel firmware update (something like this was among the last updates).

[Martin Wildam (mwildam)]

logging off and in again helps. But that is super annoying, especially when many applications are open.

But found another workaround: Closing the laptop lid and re-opening brings back graphic performance.

BTW: When I wrote laptop "BIOS", I meant the power saving configuration under System->Preferences->Power Management.
Attached my relevant power management configuration (I am attached to power):

[Martin Wildam (mwildam)]

I also wrote "Xorg consumes a notable amount of processor time". It does so also every now and then when graphics is fast again, so this is probably not an indicator for the problem.

[Martin Wildam (mwildam)]

It might be of interest, that:

Problem does not occur, when using the laptop with docking station and external monitor connected (via HDMI) and ONLY that one active (laptop lid closed and display inactive - LVDS1 off in xrandr) - but it seems clear because there seems to be another problem with the external monitor: It isn't blanked at all. ;-)

[Chris Wilson (ickle)]

It was the bad PAT after resume bug.