| Message ID | 201210240847.52417.linux@rainbow-software.org (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
On Wednesday 24 of October 2012 08:47:52 Ondrej Zary wrote: > Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to enable A20 > line but resume code assumes that KBC was used. > The laptop will not resume from S3 otherwise but powers off after a while > and then powers on again stuck with a blank screen. > > Fix it by enabling A20 using KBC. Affected laptop list and DMI data are from > bug reports at Ubuntu Launchpad. > > Tested with EX600 and PR200. > > Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 > > Signed-off-by: Ondrej Zary <linux@rainbow-software.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- a/arch/x86/kernel/acpi/boot.c > +++ b/arch/x86/kernel/acpi/boot.c > @@ -1349,6 +1349,20 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) > } > > /* > + * Enable A20 line using KBC even if it's already enabled using other method. > + * This is needed for some MSI laptops to resume from S3. > + */ > +static int __init a20_enable_kbc(const struct dmi_system_id *d) > +{ > + printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n", d->ident); > + outb(0xd1, 0x64); /* Command write */ > + outb(0xdf, 0x60); /* A20 on */ > + outb(0xff, 0x64); /* Null command, but UHCI wants it */ > + > + return 0; > +} > + > +/* > * If your system is blacklisted here, but you find that acpi=force > * works for you, please contact linux-acpi@vger.kernel.org > */ > @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = { > DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), > }, > }, > + /* > + * Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to > + * enable A20 line but resume code assumes that KBC was used. > + * The laptop will not resume from S3 otherwise but powers off > + * after a while and then powers on again stuck with a blank screen. > + */ > + { > + .callback = a20_enable_kbc, > + .ident = "MSI EX600 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"), > + }, > + }, > + { > + .callback = a20_enable_kbc, > + .ident = "MSI EX700 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "EX700"), > + }, > + }, > + { > + .callback = a20_enable_kbc, > + .ident = "MSI GX700 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "GX700"), > + }, > + }, > + { > + .callback = a20_enable_kbc, > + .ident = "MSI VR201 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"), > + }, > + }, > + { > + .callback = a20_enable_kbc, > + .ident = "MSI VR601 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"), > + }, > + }, > + { > + .callback = a20_enable_kbc, > + .ident = "MSI PR200 Laptop", > + .matches = { > + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"), > + }, > + }, > {} > }; > > > >
Minor concern: it should do the wait for ready before sending each command. "Rafael J. Wysocki" <rjw@sisk.pl> wrote: >On Wednesday 24 of October 2012 08:47:52 Ondrej Zary wrote: >> Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to >enable A20 >> line but resume code assumes that KBC was used. >> The laptop will not resume from S3 otherwise but powers off after a >while >> and then powers on again stuck with a blank screen. >> >> Fix it by enabling A20 using KBC. Affected laptop list and DMI data >are from >> bug reports at Ubuntu Launchpad. >> >> Tested with EX600 and PR200. >> >> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 >> >> Signed-off-by: Ondrej Zary <linux@rainbow-software.org> > >Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > >> --- a/arch/x86/kernel/acpi/boot.c >> +++ b/arch/x86/kernel/acpi/boot.c >> @@ -1349,6 +1349,20 @@ static int __init >dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) >> } >> >> /* >> + * Enable A20 line using KBC even if it's already enabled using >other method. >> + * This is needed for some MSI laptops to resume from S3. >> + */ >> +static int __init a20_enable_kbc(const struct dmi_system_id *d) >> +{ >> + printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n", >d->ident); >> + outb(0xd1, 0x64); /* Command write */ >> + outb(0xdf, 0x60); /* A20 on */ >> + outb(0xff, 0x64); /* Null command, but UHCI wants it */ >> + >> + return 0; >> +} >> + >> +/* >> * If your system is blacklisted here, but you find that acpi=force >> * works for you, please contact linux-acpi@vger.kernel.org >> */ >> @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata >acpi_dmi_table[] = { >> DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), >> }, >> }, >> + /* >> + * Some MSI laptop BIOSes are broken - INT 15h code uses port 92h >to >> + * enable A20 line but resume code assumes that KBC was used. >> + * The laptop will not resume from S3 otherwise but powers off >> + * after a while and then powers on again stuck with a blank >screen. >> + */ >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI EX600 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"), >> + }, >> + }, >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI EX700 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "EX700"), >> + }, >> + }, >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI GX700 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "GX700"), >> + }, >> + }, >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI VR201 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"), >> + }, >> + }, >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI VR601 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"), >> + }, >> + }, >> + { >> + .callback = a20_enable_kbc, >> + .ident = "MSI PR200 Laptop", >> + .matches = { >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"), >> + }, >> + }, >> {} >> }; >> >> >> >>
On Wednesday 24 October 2012 21:36:04 H. Peter Anvin wrote: > Minor concern: it should do the wait for ready before sending each command. It was a hack and then I forgot to add the waits... Should I redo the patch? I'll not be able to test it as I have to return the machine. > "Rafael J. Wysocki" <rjw@sisk.pl> wrote: > >On Wednesday 24 of October 2012 08:47:52 Ondrej Zary wrote: > >> Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to > > > >enable A20 > > > >> line but resume code assumes that KBC was used. > >> The laptop will not resume from S3 otherwise but powers off after a > > > >while > > > >> and then powers on again stuck with a blank screen. > >> > >> Fix it by enabling A20 using KBC. Affected laptop list and DMI data > > > >are from > > > >> bug reports at Ubuntu Launchpad. > >> > >> Tested with EX600 and PR200. > >> > >> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 > >> > >> Signed-off-by: Ondrej Zary <linux@rainbow-software.org> > > > >Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > >> --- a/arch/x86/kernel/acpi/boot.c > >> +++ b/arch/x86/kernel/acpi/boot.c > >> @@ -1349,6 +1349,20 @@ static int __init > > > >dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) > > > >> } > >> > >> /* > >> + * Enable A20 line using KBC even if it's already enabled using > > > >other method. > > > >> + * This is needed for some MSI laptops to resume from S3. > >> + */ > >> +static int __init a20_enable_kbc(const struct dmi_system_id *d) > >> +{ > >> + printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n", > > > >d->ident); > > > >> + outb(0xd1, 0x64); /* Command write */ > >> + outb(0xdf, 0x60); /* A20 on */ > >> + outb(0xff, 0x64); /* Null command, but UHCI wants it */ > >> + > >> + return 0; > >> +} > >> + > >> +/* > >> * If your system is blacklisted here, but you find that acpi=force > >> * works for you, please contact linux-acpi@vger.kernel.org > >> */ > >> @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata > > > >acpi_dmi_table[] = { > > > >> DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), > >> }, > >> }, > >> + /* > >> + * Some MSI laptop BIOSes are broken - INT 15h code uses port 92h > > > >to > > > >> + * enable A20 line but resume code assumes that KBC was used. > >> + * The laptop will not resume from S3 otherwise but powers off > >> + * after a while and then powers on again stuck with a blank > > > >screen. > > > >> + */ > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI EX600 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"), > >> + }, > >> + }, > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI EX700 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "EX700"), > >> + }, > >> + }, > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI GX700 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "GX700"), > >> + }, > >> + }, > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI VR201 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"), > >> + }, > >> + }, > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI VR601 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"), > >> + }, > >> + }, > >> + { > >> + .callback = a20_enable_kbc, > >> + .ident = "MSI PR200 Laptop", > >> + .matches = { > >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), > >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"), > >> + }, > >> + }, > >> {} > >> };
Probably should. Ondrej Zary <linux@rainbow-software.org> wrote: >On Wednesday 24 October 2012 21:36:04 H. Peter Anvin wrote: >> Minor concern: it should do the wait for ready before sending each >command. > >It was a hack and then I forgot to add the waits... Should I redo the >patch? >I'll not be able to test it as I have to return the machine. > >> "Rafael J. Wysocki" <rjw@sisk.pl> wrote: >> >On Wednesday 24 of October 2012 08:47:52 Ondrej Zary wrote: >> >> Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to >> > >> >enable A20 >> > >> >> line but resume code assumes that KBC was used. >> >> The laptop will not resume from S3 otherwise but powers off after >a >> > >> >while >> > >> >> and then powers on again stuck with a blank screen. >> >> >> >> Fix it by enabling A20 using KBC. Affected laptop list and DMI >data >> > >> >are from >> > >> >> bug reports at Ubuntu Launchpad. >> >> >> >> Tested with EX600 and PR200. >> >> >> >> Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 >> >> >> >> Signed-off-by: Ondrej Zary <linux@rainbow-software.org> >> > >> >Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> >> > >> >> --- a/arch/x86/kernel/acpi/boot.c >> >> +++ b/arch/x86/kernel/acpi/boot.c >> >> @@ -1349,6 +1349,20 @@ static int __init >> > >> >dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) >> > >> >> } >> >> >> >> /* >> >> + * Enable A20 line using KBC even if it's already enabled using >> > >> >other method. >> > >> >> + * This is needed for some MSI laptops to resume from S3. >> >> + */ >> >> +static int __init a20_enable_kbc(const struct dmi_system_id *d) >> >> +{ >> >> + printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n", >> > >> >d->ident); >> > >> >> + outb(0xd1, 0x64); /* Command write */ >> >> + outb(0xdf, 0x60); /* A20 on */ >> >> + outb(0xff, 0x64); /* Null command, but UHCI wants it */ >> >> + >> >> + return 0; >> >> +} >> >> + >> >> +/* >> >> * If your system is blacklisted here, but you find that >acpi=force >> >> * works for you, please contact linux-acpi@vger.kernel.org >> >> */ >> >> @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata >> > >> >acpi_dmi_table[] = { >> > >> >> DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), >> >> }, >> >> }, >> >> + /* >> >> + * Some MSI laptop BIOSes are broken - INT 15h code uses port >92h >> > >> >to >> > >> >> + * enable A20 line but resume code assumes that KBC was used. >> >> + * The laptop will not resume from S3 otherwise but powers off >> >> + * after a while and then powers on again stuck with a blank >> > >> >screen. >> > >> >> + */ >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI EX600 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"), >> >> + }, >> >> + }, >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI EX700 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "EX700"), >> >> + }, >> >> + }, >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI GX700 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "GX700"), >> >> + }, >> >> + }, >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI VR201 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"), >> >> + }, >> >> + }, >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI VR601 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"), >> >> + }, >> >> + }, >> >> + { >> >> + .callback = a20_enable_kbc, >> >> + .ident = "MSI PR200 Laptop", >> >> + .matches = { >> >> + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), >> >> + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"), >> >> + }, >> >> + }, >> >> {} >> >> };
On Wed, 24 Oct 2012 12:36:04 -0700
"H. Peter Anvin" <hpa@zytor.com> wrote:
> Minor concern: it should do the wait for ready before sending each command.
Can we get a command line to do this quirk too - it strikes me that if
the MSIs rely upon it then it may be something Windows always does so
will be useful to try on other problem machines as an experiment.
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
On 10/24/2012 02:09 PM, Alan Cox wrote: > On Wed, 24 Oct 2012 12:36:04 -0700 > "H. Peter Anvin" <hpa@zytor.com> wrote: > >> Minor concern: it should do the wait for ready before sending each command. > > Can we get a command line to do this quirk too - it strikes me that if > the MSIs rely upon it then it may be something Windows always does so > will be useful to try on other problem machines as an experiment. I agree, one has to keep in mind the age-old question "how does Windows work?" since it surely has no such quirk. I'd say we're sometimes too quick to add these DMI quirks when a more general solution would be somehow figure out how the Linux behavior differs from what Windows is doing. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
My guess is that Windows explicitly enables A20 on resume. We should do that too, really... with the current heavily unified realmode code it should be easy - let me hack up a patch in the morning. Robert Hancock <hancockrwd@gmail.com> wrote: >On 10/24/2012 02:09 PM, Alan Cox wrote: >> On Wed, 24 Oct 2012 12:36:04 -0700 >> "H. Peter Anvin" <hpa@zytor.com> wrote: >> >>> Minor concern: it should do the wait for ready before sending each >command. >> >> Can we get a command line to do this quirk too - it strikes me that >if >> the MSIs rely upon it then it may be something Windows always does so >> will be useful to try on other problem machines as an experiment. > >I agree, one has to keep in mind the age-old question "how does Windows > >work?" since it surely has no such quirk. I'd say we're sometimes too >quick to add these DMI quirks when a more general solution would be >somehow figure out how the Linux behavior differs from what Windows is >doing.
On Friday 26 October 2012, H. Peter Anvin wrote: > My guess is that Windows explicitly enables A20 on resume. We should do > that too, really... with the current heavily unified realmode code it > should be easy - let me hack up a patch in the morning. Neither s3_beep nor s3_leds (this patch: https://lists.ubuntu.com/archives/kernel-team/2011-May/015621.html ) worked for me so I thing that BIOS breaks on resume before we can do anything. > Robert Hancock <hancockrwd@gmail.com> wrote: > >On 10/24/2012 02:09 PM, Alan Cox wrote: > >> On Wed, 24 Oct 2012 12:36:04 -0700 > >> > >> "H. Peter Anvin" <hpa@zytor.com> wrote: > >>> Minor concern: it should do the wait for ready before sending each > > > >command. > > > >> Can we get a command line to do this quirk too - it strikes me that > > > >if > > > >> the MSIs rely upon it then it may be something Windows always does so > >> will be useful to try on other problem machines as an experiment. > > > >I agree, one has to keep in mind the age-old question "how does Windows > > > >work?" since it surely has no such quirk. I'd say we're sometimes too > >quick to add these DMI quirks when a more general solution would be > >somehow figure out how the Linux behavior differs from what Windows is > >doing.
--- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -1349,6 +1349,20 @@ static int __init dmi_ignore_irq0_timer_override(const struct dmi_system_id *d) } /* + * Enable A20 line using KBC even if it's already enabled using other method. + * This is needed for some MSI laptops to resume from S3. + */ +static int __init a20_enable_kbc(const struct dmi_system_id *d) +{ + printk(KERN_NOTICE "%s detected: enabling A20 using KBC\n", d->ident); + outb(0xd1, 0x64); /* Command write */ + outb(0xdf, 0x60); /* A20 on */ + outb(0xff, 0x64); /* Null command, but UHCI wants it */ + + return 0; +} + +/* * If your system is blacklisted here, but you find that acpi=force * works for you, please contact linux-acpi@vger.kernel.org */ @@ -1423,6 +1437,60 @@ static struct dmi_system_id __initdata acpi_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), }, }, + /* + * Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to + * enable A20 line but resume code assumes that KBC was used. + * The laptop will not resume from S3 otherwise but powers off + * after a while and then powers on again stuck with a blank screen. + */ + { + .callback = a20_enable_kbc, + .ident = "MSI EX600 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook EX600"), + }, + }, + { + .callback = a20_enable_kbc, + .ident = "MSI EX700 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "EX700"), + }, + }, + { + .callback = a20_enable_kbc, + .ident = "MSI GX700 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "GX700"), + }, + }, + { + .callback = a20_enable_kbc, + .ident = "MSI VR201 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR201"), + }, + }, + { + .callback = a20_enable_kbc, + .ident = "MSI VR601 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook VR601"), + }, + }, + { + .callback = a20_enable_kbc, + .ident = "MSI PR200 Laptop", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"), + DMI_MATCH(DMI_PRODUCT_NAME, "MSI Notebook PR200"), + }, + }, {} };
Some MSI laptop BIOSes are broken - INT 15h code uses port 92h to enable A20 line but resume code assumes that KBC was used. The laptop will not resume from S3 otherwise but powers off after a while and then powers on again stuck with a blank screen. Fix it by enabling A20 using KBC. Affected laptop list and DMI data are from bug reports at Ubuntu Launchpad. Tested with EX600 and PR200. Fixes https://bugzilla.kernel.org/show_bug.cgi?id=12878 Signed-off-by: Ondrej Zary <linux@rainbow-software.org>