Re: b44: regression in 2.6.22 (resend)

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On Monday 28 May 2007, Michael Buesch wrote:
> Can you give 2.6.16 a try? The diff is not that big and we might
> be able to find out what broke if you find out 2.6.16 works.
> You can also try later kernels like .17, .18, .19 to further
> reduce the patch. (You could also git-bisect, if you have the time).
>
I did some testing and compiled some kernels and here are the results:

I was able to find out what causes the problems for me.  I did build two 
2.6.21.3 kernels, and one does work fine and the other doesn't.

This is a diff of the kernel configs I used:

--- /usr/src/linux-2.6.21.3-oldconfig1/.config  2007-05-28 13:41:15.000000000 
+0200
+++ /usr/src/linux-2.6.21.3/.config     2007-05-28 14:46:08.000000000 +0200
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Linux kernel version: 2.6.21.3
-# Mon May 28 13:41:15 2007
+# Mon May 28 14:46:09 2007
 #
 CONFIG_X86_32=y
 CONFIG_GENERIC_TIME=y
@@ -32,7 +32,7 @@
 #
 # General setup
 #
-CONFIG_LOCALVERSION="-oldconfig1"
+CONFIG_LOCALVERSION=""
 CONFIG_LOCALVERSION_AUTO=y
 CONFIG_SWAP=y
 CONFIG_SYSVIPC=y
@@ -108,9 +108,9 @@
 #
 # Processor type and features
 #
-# CONFIG_TICK_ONESHOT is not set
+CONFIG_TICK_ONESHOT=y
 # CONFIG_NO_HZ is not set
-# CONFIG_HIGH_RES_TIMERS is not set
+CONFIG_HIGH_RES_TIMERS=y
 # CONFIG_SMP is not set
 CONFIG_X86_PC=y
 # CONFIG_X86_ELAN is not set

The -oldconfig1 is the kernel that had no problems and the other shows the b44 
problem. So if High Resolution Timer Support is disabled everything works 
fine and if I enable it the problems do appear again.

I didn't test this on my 2.6.22-rc3 kernel yet, but I guess disabling High 
Resolution Timer Support will also solve the problem there.

The older kernels I tried also work perfectly fine and they didn't have the 
High Resolution Timer Support yet.

Maxi

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