So my suggestion would be to: 1. Open issue in drm/xe tracker
https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/new Please include the Launchpad URL and attach: - edid.bin - brightness-rc5-drm.log - brightness-rc5-vesa-drm.log - The tested kernel version - Laptop, BIOS, GPU and panel identifiers - A short comparison of automatic PWM mode and xe.enable_dpcd_backlight=2 2. The firmware issue can also be reported to Lenovo Support https://support.lenovo.com/contact-us Please ask Lenovo to escalate it to the BIOS or display firmware team. Include the machine type 83SN, BIOS TNCN37WW 1.37, panel EF25QBA63.B and the Launchpad link. Explain that the BIOS VBT selects PCH PWM, which does not affect the physical screen, while VESA AUX works when forced. After filing the upstream issue, please add its URL to Launchpad so the reports can be tracked together. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163244 Title: Ubuntu 26.04 LTS -- Lenovo Yoga 7 Pro 15IPH11 Screen Brightness not Working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163244/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
