Several power management problems are solved by using 64-bit Ubuntu on the DarU2 / MS-1221.
1. Under 32-bit Ubuntu, the machine would literally shut off while trying to resume from S-1 suspend. Under 64-bit, S-1 suspend works perfectly.
2. Under 32-bit the screen would alternately dim and brighten as the machine was failing to accurately determine if it was on A/C or Battery power. Under 64-bit Ubuntu, this is also fixed.
Several power management problems are solved by using 64-bit Ubuntu on the DarU2 / MS-1221.
1. Under 32-bit Ubuntu, the machine would literally shut off while trying to resume from S-1 suspend. Under 64-bit, S-1 suspend works perfectly.
2. Under 32-bit the screen would alternately dim and brighten as the machine was failing to accurately determine if it was on A/C or Battery power. Under 64-bit Ubuntu, this is also fixed.
From here on out, we will participate in this bug report... /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/139701
https:/
Let me know what other info I can provide.