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platform/x86: intel-vbtn: Switch to an allow-list for SW_TABLET_MODE reporting 

2 recent commits:
cfae58ed68 ("platform/x86: intel-vbtn: Only blacklist SW_TABLET_MODE
on the 9 / "Laptop" chasis-type")
1fac39fd03 ("platform/x86: intel-vbtn: Also handle tablet-mode switch on
"Detachable" and "Portable" chassis-types")

Enabled reporting of SW_TABLET_MODE on more devices since the vbtn ACPI
interface is used by the firmware on some of those devices to report this.

Testing has shown that unconditionally enabling SW_TABLET_MODE reporting
on all devices with a chassis type of 8 ("Portable") or 10 ("Notebook")
which support the VGBS method is a very bad idea.

Many of these devices are normal laptops (non 2-in-1) models with a VGBS
which always returns 0, which we translate to SW_TABLET_MODE=1. This in
turn causes userspace (libinput) to suppress events from the builtin
keyboard and touchpad, making the laptop essentially unusable.

Since the problem of wrongly reporting SW_TABLET_MODE=1 in combination
with libinput, leads to a non-usable system. Where as OTOH many people will
not even notice when SW_TABLET_MODE is not being reported, this commit
changes intel_vbtn_has_switches() to use a DMI based allow-list.

The new DMI based allow-list matches on the 31 ("Convertible") and
32 ("Detachable") chassis-types, as these clearly are 2-in-1s and
so far if they support the intel-vbtn ACPI interface they all have
properly working SW_TABLET_MODE reporting.

Besides these 2 generic matches, it also contains model specific matches
for 2-in-1 models which use a different chassis-type and which are known
to have properly working SW_TABLET_MODE reporting.

This has been tested on the following 2-in-1 devices:

Dell Venue 11 Pro 7130 vPro
HP Pavilion X2 10-p002nd
HP Stream x360 Convertible PC 11
Medion E1239T

Fixes: cfae58ed68 ("platform/x86: intel-vbtn: Only blacklist SW_TABLET_MODE on the 9 / "Laptop" chasis-type")
BugLink: https://forum.manjaro.org/t/keyboard-and-touchpad-only-work-on-kernel-5-6/22668
BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1175599
Cc: Barnabás Pőcze <pobrn@protonmail.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
zero-sugar-mainline-defconfig
Hans de Goede 2020-09-30 15:19:05 +02:00 committed by Andy Shevchenko
parent 21d64817c7
commit 8169bd3e6e
1 changed files with 43 additions and 9 deletions
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52
drivers/platform/x86/intel-vbtn.c
View File

@ -167,20 +167,54 @@ static bool intel_vbtn_has_buttons(acpi_handle handle)
return ACPI_SUCCESS(status);
}
/*
* There are several laptops (non 2-in-1) models out there which support VGBS,
* but simply always return 0, which we translate to SW_TABLET_MODE=1. This in
* turn causes userspace (libinput) to suppress events from the builtin
* keyboard and touchpad, making the laptop essentially unusable.
*
* Since the problem of wrongly reporting SW_TABLET_MODE=1 in combination
* with libinput, leads to a non-usable system. Where as OTOH many people will
* not even notice when SW_TABLET_MODE is not being reported, a DMI based allow
* list is used here. This list mainly matches on the chassis-type of 2-in-1s.
*
* There are also some 2-in-1s which use the intel-vbtn ACPI interface to report
* SW_TABLET_MODE with a chassis-type of 8 ("Portable") or 10 ("Notebook"),
* these are matched on a per model basis, since many normal laptops with a
* possible broken VGBS ACPI-method also use these chassis-types.
*/
static const struct dmi_system_id dmi_switches_allow_list[] = {
{
.matches = {
DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "31" /* Convertible */),
},
},
{
.matches = {
DMI_EXACT_MATCH(DMI_CHASSIS_TYPE, "32" /* Detachable */),
},
},
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Venue 11 Pro 7130"),
},
},
{
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP Stream x360 Convertible PC 11"),
},
},
{} /* Array terminator */
};
static bool intel_vbtn_has_switches(acpi_handle handle)
{
const char *chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
unsigned long long vgbs;
acpi_status status;
/*
* Some normal laptops have a VGBS method despite being non-convertible
* and their VGBS method always returns 0, causing detect_tablet_mode()
* to report SW_TABLET_MODE=1 to userspace, which causes issues.
* These laptops have a DMI chassis_type of 9 ("Laptop"), do not report
* switches on any devices with a DMI chassis_type of 9.
*/
if (chassis_type && strcmp(chassis_type, "9") == 0)
if (!dmi_check_system(dmi_switches_allow_list))
return false;
status = acpi_evaluate_integer(handle, "VGBS", NULL, &vgbs);