If I use i915.disable_pch_pwm=0 with the legacy OPROM enabled, I have to run "echo 0 > /sys/class/backlight/intel_backlight/brightness", after which the backlight keys work. If I use i915.disable_pch_pwm=1 with the legacy OPROM _disabled_, the backlight keys work without any additional work.
If I use i915.disable_pch_pwm=0 with the legacy OPROM _disabled_, your test kernel fixes the backlight issue. (However, apparently Saucy's kernel causes really bad graphics corruption if the legacy OPROM is disabled, which is a separate issue.)
And for kicks, i915.disable_pch_pwm=1 with the legacy OPROM disabled brings the system up with the backlight at its lowest setting.
I tested on an L322X with _F_HD display and A09 BIOS in UEFI mode.
$ cat /proc/cmdline /vmlinuz- 3.11.0- 14-generic root=/dev/ mapper/ ubuntu- -vg-root ro splash quiet i915.disable_ pch_pwm= 0 vt.handoff=7
BOOT_IMAGE=
If I use i915.disable_ pch_pwm= 0 with the legacy OPROM enabled, I have to run "echo 0 > /sys/class/ backlight/ intel_backlight /brightness" , after which the backlight keys work. If I use i915.disable_ pch_pwm= 1 with the legacy OPROM _disabled_, the backlight keys work without any additional work.
If I use i915.disable_ pch_pwm= 0 with the legacy OPROM _disabled_, your test kernel fixes the backlight issue. (However, apparently Saucy's kernel causes really bad graphics corruption if the legacy OPROM is disabled, which is a separate issue.) pch_pwm= 1 with the legacy OPROM disabled brings the system up with the backlight at its lowest setting.
And for kicks, i915.disable_