Atualizei recentemente de 12,04 x64 para 14.04.1 x64 Laptop Dell Latitude
Estou vendo mensagens no dmesg que estão me causando preocupação. Os dois trechos abaixo são os que mais me interessam:
[ 4.804950] i915 0000:00:02.0: irq 46 for MSI/MSI-X
[ 4.804961] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 4.804963] [drm] Driver supports precise vblank timestamp query.
[ 4.829044] [drm] Wrong MCH_SSKPD value: 0x16040307
[ 4.829047] [drm] This can cause pipe underruns and display issues.
[ 4.829048] [drm] Please upgrade your BIOS to fix this.
e isso:
[ 6.724294] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input13
[ 6.724363] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[ 6.724426] ACPI Warning: 0x0000000000000428-0x000000000000042f SystemIO conflicts with Region \PMIO 1 (20131115/utaddress-251)
[ 6.724432] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 6.724435] ACPI Warning: 0x0000000000000540-0x000000000000054f SystemIO conflicts with Region \GPIO 1 (20131115/utaddress-251)
[ 6.724440] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 6.724441] ACPI Warning: 0x0000000000000530-0x000000000000053f SystemIO conflicts with Region \GPIO 1 (20131115/utaddress-251)
[ 6.724446] ACPI Warning: 0x0000000000000530-0x000000000000053f SystemIO conflicts with Region \_SB_.PCI0.PEG0.VID_.GPSP 2 (20131115/utaddress-251)
[ 6.724449] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 6.724451] ACPI Warning: 0x0000000000000500-0x000000000000052f SystemIO conflicts with Region \GPIO 1 (20131115/utaddress-251)
[ 6.724454] ACPI Warning: 0x0000000000000500-0x000000000000052f SystemIO conflicts with Region \_SB_.PCI0.PEG0.VID_.GPSP 2 (20131115/utaddress-251)
[ 6.724457] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver
[ 6.724459] lpc_ich: Resource conflict(s) found affecting gpio_ich
UPDATE: Em relação à mensagem do BIOS, atualizei meu BIOS e resolvi o problema.
Ainda procurando ajuda nos avisos da ACPI, se alguém puder me apontar na direção certa. ....