Comment 52 for bug 595896

I hereby confirm the following regressions on a Lenovo SL510 laptop since maverick (10.10) upgrade:
- The sound-mute button and the sound-mute LED no longer work. They both used to work in 10.04 but for internal speakers only, and were ineffective for the external jack.
- The mic-mute button does not work in 10.10, and did not work either in 10.04. Also, the front mic are always disabled by default at boot time, and one needs to activate the front mic with Alsa mixer to get it work. I was unable to get front-mic working at all in 10.04, so some little improvement here.
- Brightness control through <Fn> keys is cycling twice through the brightness indication bar in order to reach full brightness settings. It used to work correctly in 10.04.
- Brightness settings are lost when laptop enter some screen saving mode: one has to restore them by means of <Fn> key. This (rather annoying) malfunctionning was already present in 10.04.
- Standby mode does not work in 10.10, and did not work either in 10.04: the led keeps on flashing and fans keep on running without the laptop entering true standby; unable to wake up; need hard power off by pressing the power button for 5 seconds. This is a SEVERE restriction as standby mode is very helpful for a laptop, and need fix asap. Don't know if that bug is related to acpi module, but it is an hardware issue for sure.

FYI, the BIOS laptop has been upgraded to 1.41. The BIOS upgrade did not improve anything so far: same behaviour as before the upgrade.

We URGENTLY need prompt and effective support from Lenovo and/or acpi expert people to get acpi correctly tuned for that SL510 laptop model as those issues are pending for a too long time now (more than a year).

Regards