Every 30 seconds (not precisely, sometimes around 10) the screen fades out to vertical color stripes that are somewhat affected by what's happening on screen. Mostly, the color is greenish-brown. If I shut off the screen and turn it back on, it goes away for another 30 seconds. It usually takes about 10 seconds to go away, but then comes back either almost immediately, in about 30 seconds, or not at all, for a while. If I connect the laptop to an external monitor, the problem is not seen.
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