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Old 05-12-2008, 03:25 PM
Stefan Bader
Default SRU request for LP#152187

This is a multi-part message in MIME format.https://bugs.launchpad.net/ubuntu/+bug/152187

SRU justification:

Impact: Some devices fail to operate after suspend. The bug is
restricted to the serial Wacom tablet but the scope of this might be
larger. The underlying problem is that acpi allows irq to be represented
as 3 or 4 byte descriptors. Linux always converted those to 3 byte
versions. Irq descriptors are written before suspend and they have to be
in the format they were read. This wasn't honored by Linux and would
cause problems.

Patch: [attached]. Unfortunately a bit large and causes an ABI bump. The
patch is being in the process to get integrated into mainline but due to
the complicated nature of acpi fixes this has been delayed.

Testcase: Suspend and resume with serial Wacom tablet attached. See bug
report for verification feedback.
Old 06-09-2008, 01:07 PM
Stefan Bader
Default SRU request for LP#152187


SRU justification:

Impact: This bug showed up on suspend/resume with a serial Wacom tablet,
but due to the nature of the problem could also hide in other
suspend/resume problems. Whenever IRQ descriptors with 3 bytes are saved
as 2 byte descriptors this can cause trouble since this is often assumed
to be the same size.

Fix: Some major changes to the ACPI subsystem. Most of it is accepted
upstream. Just the way of incooperation it is slow. But should make it
for 2.6.26 (although then hidden in other changes). One piece is missing
upstream which was in our test kernel. A modified version has been
accepted into -mm (diff to ours is just a debug line).
Fix has been tested in a PPA kernel for around a month now.

Testcase: Suspend with a tablet attached and resume. The tablet is not
working without the fix.

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