-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Mon, 2020-05-11 at 19:34 -0400, David Farrier wrote: > I see I am coming to this thread a bit late, but for what it is worth, > here is some additional information. > > But first, thanks to Udo Richter for suggesting the workaround of > installing linux-image-5.4.0-0.bpo.2-amd64, in other words backporting the > testing/bullseye kernel into buster. On my laptop, this fixed the > intermittent problem restoring blanked screen. It also seems to have > introduced a new problem where the computer occasionally does not blank > or lock when it should, but that is far better than occasionally losing > work-in-progress due to inability to restore the screen.
I've also re-pinged upstream Linux and the patch should be included in the next Linux point release (hopefully 4.19.123), and which will then be included in Debian buster for the next Debian point release (hopefully 10.5). It's not tomorrow but still it should help at one point. > > However, this does not seem to simply be a case of buster's default 4.19.0 > kernel being buggy. I say this, because I tried the backport version of > 4.19.0 in stretch. On my laptop, screen blanking and locking work just > fine in stretch, regardless whether it is the default 4.9.0 or the > backported 4.19.0 kernel. Apparently, something besides the kernel > changed between stretch and buster. Yes, it's likely the userland part also has changed. Maybe it changed from the Intel driver to the Modesetting one, or maybe the Modesetting gained (partial) support for atomics or something. Regards, - -- Yves-Alexis -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEE8vi34Qgfo83x35gF3rYcyPpXRFsFAl66aNAACgkQ3rYcyPpX RFtAJggAvRXqZoOgEKrbDKyN5VoSDnMKB/AA/cbxBiFpXXpCt/RSsn4yyWEqDmj8 Lgp2QjCJvfLrW4G9XWfmq6vNrU/JdplDMUCFE302zHQuBMEXOmSUwUSIQJ8YyOhx f2Fo0SEGV1LPIvr0dQkGZOSi1tSHBWj9/RaWwP3VKys0PxpkXKRfuoCmzUW6S8As FhVjuQDurgQYhbDHcENnHm2D+vjbbjVjJ6/Ww0PsBOVbRu0JYal5KOnIDa2wjNp3 VKxgMvTTskYuCdCiriCdH5c17GYNXmAK5JZD2el63a6mSw0Oxsx0lhlgnuzAf7/K tjJQlOLAqk/AkAnQUiITGcaasZM4Vw== =umz8 -----END PGP SIGNATURE-----