Comment 54 for bug 156824

Hi all,
My otherwise very well-supported Acer 1410 notebook has been suffering from this bug for a number of months. My symptoms are very similar to the OP's: high CPU usage when the screen is closed, flickering and unresponsiveness after it is reopened. If I leave the screen closed for more than a few minutes, the system become permanently unresponsive AFAICT, and SysRq-B is the only way to reboot.

If I flip to a virtual terminal, then close the screen... there is no problem. It is *only* when I am on the X terminal that this problem occurs.

I have tried setting /proc/acpi/video/*/DOS to 0, 4, and 6. None of these fix the problem.

I am running Ubuntu 10.04's kernel 2.6.32-21-generic, on i386. I do not have Compiz enabled.

Here is my lspci -nn output:

00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub [8086:2a40] (rev 07)
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
00:02.1 Display controller [0380]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a43] (rev 07)
00:1a.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 [8086:2937] (rev 03)
00:1a.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 [8086:293c] (rev 03)
00:1b.0 Audio device [0403]: Intel Corporation 82801I (ICH9 Family) HD Audio Controller [8086:293e] (rev 03)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 [8086:2940] (rev 03)
00:1c.3 PCI bridge [0604]: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 [8086:2946] (rev 03)
00:1d.0 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 [8086:2934] (rev 03)
00:1d.1 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 [8086:2935] (rev 03)
00:1d.2 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 [8086:2936] (rev 03)
00:1d.7 USB Controller [0c03]: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 [8086:293a] (rev 03)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev 93)
00:1f.0 ISA bridge [0601]: Intel Corporation ICH9M-E LPC Interface Controller [8086:2917] (rev 03)
00:1f.2 SATA controller [0106]: Intel Corporation ICH9M/M-E SATA AHCI Controller [8086:2929] (rev 03)
00:1f.3 SMBus [0c05]: Intel Corporation 82801I (ICH9 Family) SMBus Controller [8086:2930] (rev 03)
01:00.0 Ethernet controller [0200]: Atheros Communications AR8131 Gigabit Ethernet [1969:1063] (rev c0)
02:00.0 Network controller [0280]: Intel Corporation WiFi Link 5100 [8086:4232]

I have attached a tarball with the outputs of intel_reg_dumper before, during, and after the screen close for DOS values of 0, 4, and 6. I used this simple script to produce these:

echo $DOS | tee /proc/acpi/video/OVGA/DOS; echo before; intel_reg_dumper > before.DOS=$DOS; sleep 10; echo during; intel_reg_dumper > during.DOS=$DOS; sleep 10; echo after; intel_reg_dumper > after.DOS=$DOS

I can provide more diagnostic information in a timely fashion if it is useful. Thanks!