add uhci_hcd bug to README.md

diff --git a/.gitignore b/.gitignore
index 0331bbbddbdebeee16d79d2da12112d9291559c3..f4379321332ab2be059b81a0a23e3e114f56e91d 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,5 @@
 *.exe
 *.out
 *.app
+
+/evhz

diff --git a/README.md b/README.md
index 40dbeeb4bc9406889ad018b3f14506e5ae4c6eaf..780a9adb2c65699d57173c7c931ef0d3ea1c612a 100644 (file)
--- a/README.md
+++ b/README.md
@@ -11,6 +11,11 @@ The program is just evhz.c. Compile and run:
 
 Nonverbose mode = -n
 
+There exists a kernel bug for USB ports which use the uhci_hcd driver,
+where a 1000 hz mouse will only read at 500hz, causing jittering:
+https://bugzilla.kernel.org/show_bug.cgi?id=60586. A workaround is to
+use USB ports that use the ehci-pci driver.
+
 Maintainer: Ian Kelling <ian@iankelling.org>
 
 Bugs, patches, requests, feedback are welcome.