On 2020-09-12 12:49 a.m., Greg KH wrote:

On Fri, Sep 11, 2020 at 04:14:20PM -0600, Alex Hung wrote:

...

Default backlight interface is AMD's radeon_bl0 which does not work on this system. As a result, let's for ACPI backlight interface for this system.

BugLink: https://bugs.launchpad.net/bugs/1894667

Cc: All applicable stable@vger.kernel.org Signed-off-by: Alex Hung alex.hung@canonical.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 2499d7e..05047a3 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -282,6 +282,15 @@ 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 */ { -- 2.7.4

<formletter>

This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly.

</formletter>

Sorry about this.

I will send V2 to correct it to "Cc: stable@vger.kernel.org"