Public bug reported: Duet 3i backlight doesn't work with kernel 5.13 on jammy alpha. But it is currently the same kernel with witch impish runs.
I suspect it needs the parameter i915.enable_dpcd_backlight=1 to make it work. However this function is broken since 5.12, please backport the following upstream patches. https://patchwork.freedesktop.org/series/95127/ Freedesktop bug report https://gitlab.freedesktop.org/drm/intel/-/issues/3680 ** Affects: linux Importance: Unknown Status: Unknown ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Affects: linux-hwe (Ubuntu) Importance: Undecided Status: New ** Affects: linux-hwe-5.13 (Ubuntu) Importance: Undecided Status: New ** Bug watch added: gitlab.freedesktop.org/drm/intel/-/issues #3680 https://gitlab.freedesktop.org/drm/intel/-/issues/3680 ** Also affects: linux via https://gitlab.freedesktop.org/drm/intel/-/issues/3680 Importance: Unknown Status: Unknown ** Also affects: linux-hwe (Ubuntu) Importance: Undecided Status: New ** Also affects: linux-hwe-5.13 (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1951692 Title: Backlight adjustment doesn't work on Lenovo Ideapad Duet 3i Status in Linux: Unknown Status in linux package in Ubuntu: New Status in linux-hwe package in Ubuntu: New Status in linux-hwe-5.13 package in Ubuntu: New Bug description: Duet 3i backlight doesn't work with kernel 5.13 on jammy alpha. But it is currently the same kernel with witch impish runs. I suspect it needs the parameter i915.enable_dpcd_backlight=1 to make it work. However this function is broken since 5.12, please backport the following upstream patches. https://patchwork.freedesktop.org/series/95127/ Freedesktop bug report https://gitlab.freedesktop.org/drm/intel/-/issues/3680 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1951692/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
