More tests:
I've been able to reproduce the random behavior reported by @Svante.
Sometimes the native resolution mode of the monitor (1366x768) is
recognized, sometimes it does not, and the system falls to 1024x768.
As a workaround I've created a typical screen.conf section in
/usr/share/X11/xorg.conf.d
Section "Screen"
Identifier "Default Screen"
Monitor " Configured Monitor"
Device " Configured Video Device"
SubSection "Display"
Virtual 1366 768
EndSubSection
EndSection
>From then on I have not experienced the problem. Being a random
behaviour it is dificcult to confirm the efficacy of this fix without a
more thoroughly examination of log files and so on.
As to flickering, I think it is much less noticeable at reduced
backlight levels. Backlight control is not activated by default in these
Vaio machines. It must be pass a paramater from grub. I have config my
grub file (/etc/default/grub) to do this:
GRUB_CMDLINE_LINUX_DEFAULT="pci=noacpi"
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https://bugs.launchpad.net/bugs/972294
Title:
Precise GMA500 screen resolution and flicker
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