Comment 3 for bug 325518

Problem for me too on both my Ubuntu 9.04 workstation (with all Intel chipset) and my Ubuntu 8.04.2 Server (SiS chipset) from which the output below is shown:

~$ sudo hwclock --debug
hwclock from util-linux-ng 2.13.1
hwclock: Open of /dev/rtc failed, errno=16: Device or resource busy.
No usable clock interface found.
Cannot access the Hardware Clock via any known method.

~$ uname -a
Linux server 2.6.24-24-server #1 SMP Wed Apr 15 16:36:01 UTC 2009 i686 GNU/Linux

~$ lspci
00:00.0 Host bridge: Silicon Integrated Systems [SiS] 661FX/M661FX/M661MX Host (rev 11)
00:01.0 PCI bridge: Silicon Integrated Systems [SiS] SiS AGP Port (virtual PCI-to-PCI bridge)
00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS964 [MuTIOL Media IO] (rev 36)
00:02.7 Multimedia audio controller: Silicon Integrated Systems [SiS] AC'97 Sound Controller (rev a0)
00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.2 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f)
00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller
00:05.0 IDE interface: Silicon Integrated Systems [SiS] RAID bus controller 180 SATA/PATA [SiS] (rev 01)
00:09.0 Ethernet controller: Intel Corporation 82541GI Gigabit Ethernet Controller
00:0b.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
00:0b.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 661/741/760 PCI/AGP or 662/761Gx PCIE VGA Display Adapter