1. Forum
  2. Usenet
  3. LINUX.DEBIAN.BUGS.DIST

  • Bug#1035878: rpi400: visual speckling on 'faulty' HDMI port during mous

    From Ben Hutchings@21:1/5 to James Addison on Sat Jul 12 18:40:02 2025
    XPost: linux.debian.kernel

    Hi all,

    On Tue, 2025-04-29 at 10:40 +0000, James Addison wrote:
    Control: tags -1 patch

    Hi Diederik, Maxime,

    On Wed, 10 May 2023 19:20:45 +0200, Diederik wrote:
    Control: forwarded -1 https://lore.kernel.org/all/[email protected]/

    I've found the time to test Maxime's vc4 dlist deferral patch -- with
    minor adjustments to rebase against Debian's 6.12.22-1 kernel -- on an
    rpi400 machine locally.

    From testing two side-by-side kernel builds, one with the patch
    applied, and one without it, I can attest that the patch does indeed
    resolve the reported cursor/video speckling problem when using the
    mini-HDMI port most-distant from the USB-C power port.
    [...]

    Looking at the previous posting of this patch upstream, it was not clear
    to me why the patch wasn't applied. Maxime, do you know what happened?

    Would it be worth submitting James's updated patch as a v3?

    Ben.

    --
    Ben Hutchings
    Experience is directly proportional to the value of equipment destroyed
    - Carolyn Scheppner

    -----BEGIN PGP SIGNATURE-----

    iQIzBAABCgAdFiEErCspvTSmr92z9o8157/I7JWGEQkFAmhyjjUACgkQ57/I7JWG EQkfNw//fjNc+w9bEED5DygIDKbYhGgmykbCgZjRyCDlglA3zm81OKYmeQp8/iPC l4zctqgk6sVo91niEqJpaALJ9pUuPkjqwp7Ae5hQ5F+mJ+D81S9qUoyDLL2Ub6Sw 28K+SNWMe91IcUgkCXJKY7jVtIbzWo8nUgGCLDbpICg0B/6zlcZAUPXsQxqFX0GR i/y7p8XhEDQs3pMhLPrwL76rYvBghc/08ME7hCydlfu/3Fzwb+Wn2EYtXW2nj+7M pAWfwAYEFwjTfdPl8dZp54rTI6+3d86vatSUzXmFx8Ea7itxiceYupY93Rw+fO0S YKYP4x9lZtJXN5S7I8D+ueLz77IVdDc1VflJGNIUmb47rhzrNmJ4Mpe5cmAlovky MSHFaDgJ5XDhwvNHfU2lj8h+cuAj0c0MCpTfXbwnSsrHdxaxuf4uuBWFqmgOuqk8 uaTcLh8X+Sr9njghW4BpyF+nGrtiMeHBWi9rt98XsIM5lONRbifSPwBS10FfUbyg LH9pT2kCvoTqJggtHQfME2sl73fRUv1wGcta199Uak2S+d26OLojGWWVo69ImXeM 3ssClRJaJH2kfSRZsACj/CddVf1jjVn1MWeg5/9STk2i7NcLhSsa2vqtZ7EC4Eiv 07F07wSkseZFE892YuuAUdFFRQh1MKTBB3GqaO+rqjH0n3sglcs=
    =1SM9
    -----END PGP SIGNATURE-----

    --- S
  • From Maxime Ripard@21:1/5 to Ben Hutchings on Mon Jul 28 12:00:01 2025
    XPost: linux.debian.kernel

    Hi,

    On Sat, Jul 12, 2025 at 06:32:53PM +0200, Ben Hutchings wrote:
    Hi all,

    On Tue, 2025-04-29 at 10:40 +0000, James Addison wrote:
    Control: tags -1 patch

    Hi Diederik, Maxime,

    On Wed, 10 May 2023 19:20:45 +0200, Diederik wrote:
    Control: forwarded -1 https://lore.kernel.org/all/[email protected]/

    I've found the time to test Maxime's vc4 dlist deferral patch -- with
    minor adjustments to rebase against Debian's 6.12.22-1 kernel -- on an rpi400 machine locally.

    From testing two side-by-side kernel builds, one with the patch
    applied, and one without it, I can attest that the patch does indeed resolve the reported cursor/video speckling problem when using the mini-HDMI port most-distant from the USB-C power port.
    [...]

    Looking at the previous posting of this patch upstream, it was not clear
    to me why the patch wasn't applied. Maxime, do you know what happened?

    Would it be worth submitting James's updated patch as a v3?

    If I remember well, my series was considered a workaround to a bug
    triggered by an obsolete mechanism in the kernel.

    So it was advocated that we should get rid of that mechanism instead,
    and thus this series would be made irrelevant. However, removing that
    mechanism triggered a few regressions in some drivers, so it never went through, and my series was forgotten about.

    It's been in limbo ever since.

    Maxime

    -----BEGIN PGP SIGNATURE-----

    iJUEABMJAB0WIQTkHFbLp4ejekA/qfgnX84Zoj2+dgUCaIdHGgAKCRAnX84Zoj2+ dmSfAXsEtrFbk2nlIzXWnB++RQbrvw2Bose6Tgy/Enk9wcl8al9wpZ7Q35YPmqgj q9PlrA0BgJszcdTlGNgs9l3Q1XdGuuhVQ6JYL8QBZ8UidQYorEUbzJ7OdYIPIYM7
    LVgPks+SQw==
    =dXjH
    -----END PGP SIGNATURE-----

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)