Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal: apport-collect 1981727
When reporting bugs in the future please use apport by using 'ubuntu- bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.15 in Ubuntu. https://bugs.launchpad.net/bugs/1981727 Title: kernel 5.15.0-41 update results in dim screen (5.13.0-52 OK) Status in linux-hwe-5.15 package in Ubuntu: New Bug description: A recent update to 5.15.0-41 results in my laptop screen (Dell Precision 7520) being unable to come up to full brightness. I have verified that I can revert to 5.13.0-52 and the problem is not there. I looked at /sys/class/backlight/nv_backlight/max_brightness which lists 1023 in the newer kernel and 100 in the older one. I have verified that changing the brightness manually does change /sys/class/backlight/nv_backlight/brightness, all the way up to 1023, but it's just not enough... the screen is still very dim. The other screen (standalone monitor through docking station) on a two-headed display is fine. I tried to write 100 into max_brightness but of course, the "file" is read-only. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.15/+bug/1981727/+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
