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[SRU v2] [F/G/Unstable/OEM-5.10] [PATCH 0/1] Use DCPD to control HP DreamColor panel

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Kai-Heng Feng
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[SRU v2] [F/G/Unstable/OEM-5.10] [PATCH 0/1] Use DCPD to control HP DreamColor panel

Kai-Heng Feng
BugLink: https://bugs.launchpad.net/bugs/1911001

[Impact]
Cannot change brightness on HP ZBook Fury with certain panel.

[Fix]
Add the panel to DPCD quirk table to use DPCD to control the panel
backlight.

[Test]
Changing backlight sysfs doesn't change the display brightness.
With the patch applied, changing sysfs backlight can really change the
display brightness.

[Where problems could occur]
This fix is specific to a single panel, so it's not likely to cause any
regression to other devices.

Kai-Heng Feng (1):
  UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix

 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

--
2.29.2


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Kai-Heng Feng
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[PATCH v2 1/1] UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix

Kai-Heng Feng
BugLink: https://bugs.launchpad.net/bugs/1911001

Another HP DreamColor panel, which is used by new HP ZBook Fury, needs
to use DPCD to control brightness.

Once the proper fix [1] is merged, this can be dropped.

[1] https://patchwork.freedesktop.org/series/81702/

Signed-off-by: Kai-Heng Feng <[hidden email]>
---
 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index c55c14453ecb..efd50e87ec99 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1881,6 +1881,7 @@ static const struct edid_quirk edid_quirk_list[] = {
  * controls anyway...). Until we have a better way of detecting these,
  * force DPCD backlight mode on all of them.
  */
+ { MFG(0x06, 0xaf), PROD_ID(0x8c, 0xcd), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
  { MFG(0x06, 0xaf), PROD_ID(0x9b, 0x32), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
  { MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
  { MFG(0x30, 0xe4), PROD_ID(0x61, 0x06), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
--
2.29.2


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Timo Aaltonen-6
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APPLIED [OEM-5.10] Re: [SRU v2] [F/G/Unstable/OEM-5.10] [PATCH 0/1] Use DCPD to control HP DreamColor panel

Timo Aaltonen-6
In reply to this post by Kai-Heng Feng
On 12.1.2021 12.54, Kai-Heng Feng wrote:

> BugLink: https://bugs.launchpad.net/bugs/1911001
>
> [Impact]
> Cannot change brightness on HP ZBook Fury with certain panel.
>
> [Fix]
> Add the panel to DPCD quirk table to use DPCD to control the panel
> backlight.
>
> [Test]
> Changing backlight sysfs doesn't change the display brightness.
> With the patch applied, changing sysfs backlight can really change the
> display brightness.
>
> [Where problems could occur]
> This fix is specific to a single panel, so it's not likely to cause any
> regression to other devices.
>
> Kai-Heng Feng (1):
>    UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix
>
>   drivers/gpu/drm/drm_dp_helper.c | 1 +
>   1 file changed, 1 insertion(+)
>

applied to oem-5.10, thanks

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t

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Stefan Bader-2
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ACK: [PATCH v2 1/1] UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix

Stefan Bader-2
In reply to this post by Kai-Heng Feng
On 12.01.21 11:54, Kai-Heng Feng wrote:

> BugLink: https://bugs.launchpad.net/bugs/1911001
>
> Another HP DreamColor panel, which is used by new HP ZBook Fury, needs
> to use DPCD to control brightness.
>
> Once the proper fix [1] is merged, this can be dropped.
>
> [1] https://patchwork.freedesktop.org/series/81702/
>
> Signed-off-by: Kai-Heng Feng <[hidden email]>
Acked-by: Stefan Bader <[hidden email]>

> ---
>  drivers/gpu/drm/drm_dp_helper.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index c55c14453ecb..efd50e87ec99 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1881,6 +1881,7 @@ static const struct edid_quirk edid_quirk_list[] = {
>   * controls anyway...). Until we have a better way of detecting these,
>   * force DPCD backlight mode on all of them.
>   */
> + { MFG(0x06, 0xaf), PROD_ID(0x8c, 0xcd), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x06, 0xaf), PROD_ID(0x9b, 0x32), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x30, 0xe4), PROD_ID(0x61, 0x06), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>


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Paolo Pisati-5
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APPLIED H: Re: [PATCH v2 1/1] UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix

Paolo Pisati-5
In reply to this post by Kai-Heng Feng
On Tue, Jan 12, 2021 at 06:54:46PM +0800, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1911001

--
bye,
p.

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Ian May
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ACK: [PATCH v2 1/1] UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix

Ian May
In reply to this post by Kai-Heng Feng
LGTM

Acked-by: Ian May <[hidden email]>

On 2021-01-12 18:54:46 , Kai-Heng Feng wrote:

> BugLink: https://bugs.launchpad.net/bugs/1911001
>
> Another HP DreamColor panel, which is used by new HP ZBook Fury, needs
> to use DPCD to control brightness.
>
> Once the proper fix [1] is merged, this can be dropped.
>
> [1] https://patchwork.freedesktop.org/series/81702/
>
> Signed-off-by: Kai-Heng Feng <[hidden email]>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index c55c14453ecb..efd50e87ec99 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1881,6 +1881,7 @@ static const struct edid_quirk edid_quirk_list[] = {
>   * controls anyway...). Until we have a better way of detecting these,
>   * force DPCD backlight mode on all of them.
>   */
> + { MFG(0x06, 0xaf), PROD_ID(0x8c, 0xcd), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x06, 0xaf), PROD_ID(0x9b, 0x32), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x06, 0xaf), PROD_ID(0xeb, 0x41), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
>   { MFG(0x30, 0xe4), PROD_ID(0x61, 0x06), BIT(DP_QUIRK_FORCE_DPCD_BACKLIGHT) },
> --
> 2.29.2
>
>
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Kelsey Skunberg
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APPLIED[F/G]: [SRU v2] [F/G/Unstable/OEM-5.10] [PATCH 0/1] Use DCPD to control HP DreamColor panel

Kelsey Skunberg
In reply to this post by Kai-Heng Feng

Applied to F/G master-next. thank you!

-Kelsey

On 2021-01-12 18:54:45 , Kai-Heng Feng wrote:

> BugLink: https://bugs.launchpad.net/bugs/1911001
>
> [Impact]
> Cannot change brightness on HP ZBook Fury with certain panel.
>
> [Fix]
> Add the panel to DPCD quirk table to use DPCD to control the panel
> backlight.
>
> [Test]
> Changing backlight sysfs doesn't change the display brightness.
> With the patch applied, changing sysfs backlight can really change the
> display brightness.
>
> [Where problems could occur]
> This fix is specific to a single panel, so it's not likely to cause any
> regression to other devices.
>
> Kai-Heng Feng (1):
>   UBUNTU: SAUCE: drm/dp: Another HP DreamColor panel brigntness fix
>
>  drivers/gpu/drm/drm_dp_helper.c | 1 +
>  1 file changed, 1 insertion(+)
>
> --
> 2.29.2
>
>
> --
> kernel-team mailing list
> [hidden email]
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

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