From: Alex Hung alex.hung@canonical.com
stable inclusion from linux-4.19.155 commit 0b7ef21ba885b5fd0a32a3873936c6bd3bd6c676
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commit b226faab4e7890bbbccdf794e8b94276414f9058 upstream.
The default backlight interface is AMD's radeon_bl0 which does not work on this system, so use the ACPI backlight interface on it instead.
BugLink: https://bugs.launchpad.net/bugs/1894667 Cc: All applicable stable@vger.kernel.org Signed-off-by: Alex Hung alex.hung@canonical.com [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/acpi/video_detect.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index ab1da5e6e7e3..86ffb4af4afc 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -274,6 +274,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"), }, }, + /* https://bugs.launchpad.net/bugs/1894667 */ + { + .callback = video_detect_force_video, + .ident = "HP 635 Notebook", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"), + }, + },
/* Non win8 machines which need native backlight nevertheless */ {