I've been experiencing similar issues.
Here's a screenshot: http://omploader.org/vbzA1 .
Note how emacs is only taking up half of the terminal's total height.
However, my diagnostics are different from yours. Sending SIGWINCH
(in this case, to emacs) fixes the issue, at least temporarily. However,
sending SIGWINCH to the shell process under which emacs is running
(using a negative PID, to specify the "process group") has no visible effect.
I believe the issue has to do with sending SIGWINCH to process groups,
though I do not have enough experience in this area to be sure.
git-bisect tracked it down to this:
46151122e0a2e80e5a6b2889f595e371fe2b600d is first bad commit
Author: Mike Galbraith <efa...@gmx.de>
Date: Thu May 8 17:00:42 2008 +0200
sched: fix weight calculations
Starting at v2.6.26, I wasn't able to easily revert the commit. However,
the following "patch" seems to have alleviated the problem.
=== begin patch ===
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 1c7283c..0e269ed 100644
@@ -1,4 +1,4 @@
=== end patch ===
This is merely a workaround, however.
I was able to easily revert commit 46151122e0a2e80e5a6b2889f595e371fe2b600d on
the latest git version of the kernel. However, it did not alleviate the problem.
As in v2.6.26, the above patch (disabling NEW_FAIR_SLEEPERS) seems to work well.
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