I can confirm this bug on HP Tablet PC TC4200 with 2.6.15-25-686, this model is similar hardware as in IBM ThinkPad X41.
The latest update for acpi-support 0.85 doesn't help either.
I have also found a strange issue that the Suspend to RAM (Suspend) does not work without first doing a Suspend to Disk (Hibernate).
I can confirm this bug on HP Tablet PC TC4200 with 2.6.15-25-686, this model is similar hardware as in IBM ThinkPad X41.
The latest update for acpi-support 0.85 doesn't help either.
I have also found a strange issue that the Suspend to RAM (Suspend) does not work without first doing a Suspend to Disk (Hibernate).