[Bug 422202] Re: [P4M900] Laptop TFT flickers after wake up from S3 sleep

[Bryce Harrington]

** Tags added: hardy

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[P4M900] Laptop TFT flickers after wake up from S3 sleep
https://bugs.launchpad.net/bugs/422202
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Status in “pm-utils” package in Ubuntu: Confirmed
Status in “xserver-xorg-video-openchrome” package in Ubuntu: Confirmed

Bug description:
I'm using Ubuntu 9.04, my laptop is a Fujitsu Siemens Amilo Li1705.

The problem:
The laptop enters S3 sleep state properly. After waking it up (by pressing the
Power button), the laptop's TFT-LCD screen FLICKERS in graphical mode.
And when I switch to one of the console screens (e. g. by pressing Ctrl + Alt + F1)
the console text displayed is completely DISTORTED, thus unreadable.
The console screens flickers heavily horizontally.

After rebooting the computer, everything is OK.

The flickering appears only after resuming from S3 SLEEP standby state.

Technical notes about flickering:
When using the GUI (Graphical User Interface) after S3 standby,
the whole screen flickers in one's peripheral vision (like a CRT monitor with vertical refresh
frequency set to 60 Hz!). Viewing the TFT panel from a few inches, I can see
every pixel 'oscillating'. 

I remember, that the older releases of Ubuntu could not be installed on this
laptop normally, because of the same problems described above (console
display corruption).

The laptop has a VIA VN896 integrated graphics chipset.

Further notes:
This latop has a ACPI DSDT table compiled with Microsoft
compiler. So it is not a surprise, that it does NOT correspond fully to
standard ACPI specification. I was able to fix it, by editing the table's
source, and loading the corrected table at boot, so overwriting the
original table, written into BIOS chips by the manufacturer.
So I was able to make the CPU fan function correctly.
Before fixing the DSDT table, the fan did not start after waking up from
S3 sleep state. But after some corrections, it functions properly
(like when running Windows XP).

The screen flickering after resuming form S3 sleep is the only problem
I could not fix myself concerning this laptop.
So I believe, there must be a solution to this problem.

Thank you for your help in advance.

Gabor Angler
from Hungary