Bug#870641: light-locker: screen stays black after closing and opening laptop lid
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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.
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