Before and after changing the brightness:
BACKLIGHT_CONTROL: native
supported: native legacy combination kernel
BACKLIGHT: 296 (0x00000128) range: (0,296)
BACKLIGHT_CONTROL: native
supported: native legacy combination kernel
BACKLIGHT: 272 (0x00000110) range: (0,296)
All the files called brightness contain <not supported>.
This bug has the particularly annoying side-effect of turning the
brightness all the way down leaving the computer unusable without a
reboot.
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[i945gme] brightness fluxuates wildly on KMS (karmic)
https://bugs.launchpad.net/bugs/381461
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