Is there some special trick that will make a Dell ST2220L HDMI
monitor go to sleep when using the default GL driver on Buster?

With stretch the same thing happened, but the experimental GL
driver put the monitor to sleep and woke it successfully. On
Buster, the default GL driver seems to work well enough and is
more stable than the (faster) experimental. But, even though
the blanker seems to work, the monitor stays powered on.

There are numerous reports on-line of the ST2220L refusing to
wake up, but I've not found any references to chronic insomnia.

I gather there are commands to put in config.txt, but it seems
wise to ask before tampering.

Thanks for reading,

bob prohaska

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