Looking at your stripped log I can see "ACPI backlight interface available, not registering our own", thus I would say that the issue is not related to nouveau
Although can you please try the following
1 Boot into runlevel 3
Append " 3" to your kernel command line
2 Make sure that nouveau is not loaded - "lsmod" will tell you if it is
2.1 Possible solution - blacklist nouveau
3 Try to adjust the brightness via acpi
3.1 Look for *brightness* in /sys/devices/
find /sys/devices -name "*bright*" 2>/dev/null
4 Suspend
pm-suspend
5 Resume
6 Try to adjust the brightness again
7 Confirm/dismiss if it is a nouveau related issue
Hi Auke
Would you consider this as a regression ?
Looking at your stripped log I can see "ACPI backlight interface available, not registering our own", thus I would say that the issue is not related to nouveau
Although can you please try the following
1 Boot into runlevel 3
Append " 3" to your kernel command line
2 Make sure that nouveau is not loaded - "lsmod" will tell you if it is
2.1 Possible solution - blacklist nouveau
3 Try to adjust the brightness via acpi
3.1 Look for *brightness* in /sys/devices/
find /sys/devices -name "*bright*" 2>/dev/null
4 Suspend
pm-suspend
5 Resume
6 Try to adjust the brightness again
7 Confirm/dismiss if it is a nouveau related issue
I hope it helps
Cheers,
Emil