Created attachment 50058 [details]
My E-350 laptop screen flickers for ~5 minutes every time after waking from DPMS. The flicker persists through VT switches and changing the power profile to high.
After the wait it stabilizes and picture is good again.
It looks similar to a CRT on 60Hz, but xrandr is confident the mode is right for the lcd (60hz, not something lower).
Lenovo G575 laptop
Created attachment 50060 [details]
Now that I tried to make it happen manually (sleep 1 && xset dpms force off), it didn't show itself; though for the last few days, it's always happened after X's 10-minute delay DPMS.
I have this problem too on similar E350-based hardware.
Sometimes I get this flicker, sometimes the screen is garbled (bug #36513). When I get a garbled screen the flicker usually persists even after a reboot. (Though this never happens in windows so I don't think it's a hardware issue.)
I am getting this on a C-50 based Acer Aspire One 522.
I can reliably reproduce the issue with:
xset dpms force off; sleep 10; xset dpms force on
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