** Description changed: BugLink: https://bugs.launchpad.net/bugs/2046315 [Impact] On serveral Dell laptops, the screen often displays garbage or the screen is flicking + This PR is just a workaround, the upstream bug is here: + https://gitlab.freedesktop.org/drm/intel/-/issues/9739#note_2187863 + + After the upstream fixe this bug with a real fix, I will revert the + workaround and backport the real fix to Noble and Jammy oem-kernel. + [Fix] There is no real fix so far, ODM recommends to use a workaround to disable PSR2, this is a temp solution, after we get the real fix, we could revert the temp workaround. - [Test case] booting with the patched kernel, If the pannel's edid is in the qurik list, the PSR2 will be disabled (checking /sys/kernel/debug/dri/0/i915_edp_psr_status; if the pannel's edid is not in the quirk list, the graphic driver will work as before. [Where problems could occur] It is possible that the temp solution couldn't work, then the screen will still show garbage and the screen is flicking, another possible regression is the screen has no problem before, but after running patched kernel, the PSR2 is disabled and the system cost more power, but this possibility is very low, I tested the patched on some dell machines, all worked well.
** Description changed: BugLink: https://bugs.launchpad.net/bugs/2046315 [Impact] On serveral Dell laptops, the screen often displays garbage or the screen is flicking This PR is just a workaround, the upstream bug is here: https://gitlab.freedesktop.org/drm/intel/-/issues/9739#note_2187863 - After the upstream fixe this bug with a real fix, I will revert the + After the upstream fix this bug with a real fix, I will revert the workaround and backport the real fix to Noble and Jammy oem-kernel. [Fix] There is no real fix so far, ODM recommends to use a workaround to disable PSR2, this is a temp solution, after we get the real fix, we could revert the temp workaround. [Test case] booting with the patched kernel, If the pannel's edid is in the qurik list, the PSR2 will be disabled (checking /sys/kernel/debug/dri/0/i915_edp_psr_status; if the pannel's edid is not in the quirk list, the graphic driver will work as before. [Where problems could occur] It is possible that the temp solution couldn't work, then the screen will still show garbage and the screen is flicking, another possible regression is the screen has no problem before, but after running patched kernel, the PSR2 is disabled and the system cost more power, but this possibility is very low, I tested the patched on some dell machines, all worked well. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-6.5 in Ubuntu. https://bugs.launchpad.net/bugs/2046315 Title: oem-6.5: disable psr2 for some panels according to edid Status in HWE Next: New Status in linux package in Ubuntu: Triaged Status in linux-oem-6.5 package in Ubuntu: Triaged Status in linux source package in Jammy: Invalid Status in linux-oem-6.5 source package in Jammy: In Progress Status in linux source package in Noble: Triaged Status in linux-oem-6.5 source package in Noble: Triaged Bug description: BugLink: https://bugs.launchpad.net/bugs/2046315 [Impact] On serveral Dell laptops, the screen often displays garbage or the screen is flicking This PR is just a workaround, the upstream bug is here: https://gitlab.freedesktop.org/drm/intel/-/issues/9739#note_2187863 After the upstream fix this bug with a real fix, I will revert the workaround and backport the real fix to Noble and Jammy oem-kernel. [Fix] There is no real fix so far, ODM recommends to use a workaround to disable PSR2, this is a temp solution, after we get the real fix, we could revert the temp workaround. [Test case] booting with the patched kernel, If the pannel's edid is in the qurik list, the PSR2 will be disabled (checking /sys/kernel/debug/dri/0/i915_edp_psr_status; if the pannel's edid is not in the quirk list, the graphic driver will work as before. [Where problems could occur] It is possible that the temp solution couldn't work, then the screen will still show garbage and the screen is flicking, another possible regression is the screen has no problem before, but after running patched kernel, the PSR2 is disabled and the system cost more power, but this possibility is very low, I tested the patched on some dell machines, all worked well. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2046315/+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
