| Message ID | 1527478164-928-2-git-send-email-alex.hung@canonical.com |
|---|---|
| State | Accepted |
| Headers | show |
| Series | Enable BIOS workaround for system crashes | expand |
On 05/27/18 20:29, Alex Hung wrote: > BugLink: https://bugs.launchpad.net/bugs/1773299 > > A number of Dell systems require an OEM _OSI string "Linux-Dell-Video" > as a BIOS workaround to disable RTD3 which causes systems hangs when > NVidia graphics cards are installed. The affected Dell systems are > with system IDs: 0818, 0819, 0820, 0850, 0851, 086F, 0870, 0885 and > 0886. > > The form of the OEM _OSI strings is defined by each OEMs and is > discussed in Documentation/acpi/osi.txt. > > Signed-off-by: Alex Hung <alex.hung@canonical.com> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > (cherry picked from commit 9251a71db62ca9cc7e7cf364218610b0f018c291) > Signed-off-by: Alex Hung <alex.hung@canonical.com> Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com> > --- > drivers/acpi/osi.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c > index c2ef3e6c21ba..081e25e66e1c 100644 > --- a/drivers/acpi/osi.c > +++ b/drivers/acpi/osi.c > @@ -57,6 +57,15 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { > {"Processor Device", true}, > {"3.0 _SCP Extensions", true}, > {"Processor Aggregator Device", true}, > + /* > + * Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics > + * cards as RTD3 is not supported by drivers now. Systems with NVidia > + * cards will hang without RTD3 disabled. > + * > + * Once NVidia drivers officially support RTD3, this _OSI strings can > + * be removed if both new and old graphics cards are supported. > + */ > + {"Linux-Dell-Video", true}, > }; > > static u32 acpi_osi_handler(acpi_string interface, u32 supported) >
On 27.05.2018 20:29, Alex Hung wrote: > BugLink: https://bugs.launchpad.net/bugs/1773299 > > A number of Dell systems require an OEM _OSI string "Linux-Dell-Video" > as a BIOS workaround to disable RTD3 which causes systems hangs when > NVidia graphics cards are installed. The affected Dell systems are > with system IDs: 0818, 0819, 0820, 0850, 0851, 086F, 0870, 0885 and > 0886. > > The form of the OEM _OSI strings is defined by each OEMs and is > discussed in Documentation/acpi/osi.txt. > > Signed-off-by: Alex Hung <alex.hung@canonical.com> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > (cherry picked from commit 9251a71db62ca9cc7e7cf364218610b0f018c291) > Signed-off-by: Alex Hung <alex.hung@canonical.com> Acked-by: Stefan Bader <stefan.bader@canonical.com> > --- > drivers/acpi/osi.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c > index c2ef3e6c21ba..081e25e66e1c 100644 > --- a/drivers/acpi/osi.c > +++ b/drivers/acpi/osi.c > @@ -57,6 +57,15 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { > {"Processor Device", true}, > {"3.0 _SCP Extensions", true}, > {"Processor Aggregator Device", true}, > + /* > + * Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics > + * cards as RTD3 is not supported by drivers now. Systems with NVidia > + * cards will hang without RTD3 disabled. > + * > + * Once NVidia drivers officially support RTD3, this _OSI strings can > + * be removed if both new and old graphics cards are supported. > + */ > + {"Linux-Dell-Video", true}, > }; > > static u32 acpi_osi_handler(acpi_string interface, u32 supported) >
diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c index c2ef3e6c21ba..081e25e66e1c 100644 --- a/drivers/acpi/osi.c +++ b/drivers/acpi/osi.c @@ -57,6 +57,15 @@ osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { {"Processor Device", true}, {"3.0 _SCP Extensions", true}, {"Processor Aggregator Device", true}, + /* + * Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics + * cards as RTD3 is not supported by drivers now. Systems with NVidia + * cards will hang without RTD3 disabled. + * + * Once NVidia drivers officially support RTD3, this _OSI strings can + * be removed if both new and old graphics cards are supported. + */ + {"Linux-Dell-Video", true}, }; static u32 acpi_osi_handler(acpi_string interface, u32 supported)