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Subject[PATCH] enable readback to get HPET working on ATI SB4x00, kernel 2.6.35_rc5
  After commit 30a564be9d9554c168a654eddc2165869cc0d7bf 
"x86, hpet: Restrict read back to affected ATI chipsets" hpet did not
work anymore on HP nx6325. The machine hangs on booting until a
keystroke was taken. After a short time machine hangs again until next
keystroke. Applying the following patch solves the issue for me.

diff --git a/arch/x86/kernel/quirks.c b/arch/x86/kernel/quirks.c
index e72d3fc..8d28924 100644
--- a/arch/x86/kernel/quirks.c
+++ b/arch/x86/kernel/quirks.c
@@ -408,6 +408,7 @@ static void ati_force_enable_hpet(struct pci_dev *dev)
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
cached_dev = dev;
+ hpet_readback_cmp = 1;
Signed-off-by: Stephan Wolf <>

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