Good to know that it does not add anything to Xorg.0.log. That means we
can exclude something calling xrandr as being the source of this bug.
I'm not exactly sure where it belongs, but I guess probably the kernel. Screen
brightness change goes through the ACPI interface and those bugs are filed to
the kernel. In Xrandr.txt (output of `xrandr --verbose`) you have the following
lines:
BACKLIGHT_CONTROL: kernel
supported: native legacy combination kernel
BACKLIGHT: 0 (0x00000000) range: (0,7)
which bacally says that the kernel has control of the backlight and that it
currently is at level 0 of 7. Could you verify that the first 0 on the last
line changes when you turn the brightness up and down? And check what happens
to this number when you go beyond the top.
Another place to check the brightness level is in the /proc file system.
On my computer /proc/acpi/video/VID/LCD0/brightness has information
about the brightness level. You may want to check how this changes when
you change the brightness level and you trigger the bug.
Also, does the same happen when you use the hotkeys (Fn+something) to
change the brightness level? (assuming that it works).
--
[i965] Jaunty: random screen flashes
https://bugs.launchpad.net/bugs/356510
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