** Description changed: - On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce GTX - 1050 Ti Mobile] - Updating to nvidia-driver-455 results in loss of brightness control. On - boot, the laptop display brightness is somewhat less than fully bright - and cannot be changed. The brightness up/down keys do pop up the gnome - gui brightness widget, and /sys/class/backlight/nvidia_0/* values do - change, but the actual display's brightness does not. + WORKS FINE: + nvidia-driver-450: 450.102.04-0ubuntu0.18.04.1 + + NO BRIGHTNESS CONTROL: + nvidia-driver-455: 455.38-0ubuntu0.18.04.1 + nvidia-driver-460: 460.32.03-0ubuntu0.18.04.1 + + + On my Lenovo X1 Extreme with GPU: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti Mobile], and other laptop model(s): + + Updating to nvidia-driver-455 (or -460) results in loss of brightness + control. On boot, the laptop display brightness is somewhat less than + fully bright and cannot be changed. The brightness up/down keys do pop + up the gnome gui brightness widget, and /sys/class/backlight/nvidia_0/* + values do change, but the actual display's brightness does not. Problem occurs with either version of nvidia-driver-455 (the archive or - the ~graphics-drivers/PPA). Normal functionality returns if I downgrade - to any version of nvidia-driver-450. + the ~graphics-drivers/PPA) or any version of -460. + + Normal functionality returns if I downgrade to any version of nvidia- + driver-450. + + Also observed: 455 and 460 temporarily display some pixel garbage while + mode-switching during the graphic login sequence. Only a minor glitch, + but note that 450 does not exhibit that issue either. Note also that manually applying this to /lib/systemd/system/nvidia-persistenced.service has no effect on the problem: https://github.com/hugh712/nvidia-graphics-drivers/commit/bccad5ee6444dd8c5c47ba19ea0232106a1086f5 Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic kernel: 5.4.0-54-generic #60~18.04.1-Ubuntu SMP Fri Nov 6 17:25:16 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux - - nvidia-driver-455: 455.38-0ubuntu0.18.04.1
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1905591 Title: no brightness control in {455,460} after update from 450 To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1905591/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
