changing to GRUB_CMDLINE_LINUX_DEFAULT="quiet acpi_osi=Linux" did the job for me.
I'm running Ubuntu 11.10 amd64 on an HP 2540p EliteBook.
$ sudo lspci -v -s 00:02.0 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller]) Subsystem: Hewlett-Packard Company Device 7008 Flags: bus master, fast devsel, latency 0, IRQ 45 Memory at d0000000 (64-bit, non-prefetchable) [size=4M] Memory at c0000000 (64-bit, prefetchable) [size=256M] I/O ports at 5058 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915
changing to GRUB_CMDLINE_ LINUX_DEFAULT= "quiet acpi_osi=Linux" did the job for me.
I'm running Ubuntu 11.10 amd64 on an HP 2540p EliteBook.
$ sudo lspci -v -s 00:02.0
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Device 7008
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
Memory at c0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 5058 [size=8]
Expansion ROM at <unassigned> [disabled]
Kernel driver in use: i915
Kernel modules: i915