| Message ID | 20210802091414.9716-1-aaron.ma@canonical.com |
|---|---|
| Headers | show |
| Series | UBUNTU: SAUCE: Fix backlight control on Samsung 16727 panel | expand |
Acked-by: Tim Gardner <tim.gardner@canonical.com> On 8/2/21 3:14 AM, Aaron Ma wrote: > BugLink: https://bugs.launchpad.net/bugs/1930527 > > [Impact] > Backlight can't be controlled on 5.11- version of kernel. > > [Fix] > The panel needs DPCD to get control of backlight on 5.11- kernel. > After 5.12 kernel introduced new Intel HDR backlight control, and it > works well on this panel. > Add quirk ID to enable DPCD on 5.11- kernel. > > Because upstream kernel already got a fix, this patch is not going > to linus's tree. it's only for 5.11- stable kernel. > This patch had been submitted to stable kernel twice, and got Acked > by maintainer too. But still not applied. > > Regression: > It adds ID to use DPCD AUX control, it should be safe as UBUNTU SAUCE patch > for other panels. > > [Test] > Vendor Verified on hardware, with this quirk backlight can be changed on > 5.11 kernel. > > [Where problems could occur] > The panel backlight may not be changed. > > Aaron Ma (1): > UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Samsung 16727 > panel > > drivers/gpu/drm/drm_dp_helper.c | 1 + > 1 file changed, 1 insertion(+) >
Applied to hirsute master-next. thank you! -Kelsey On 2021-08-02 17:14:13 , Aaron Ma wrote: > BugLink: https://bugs.launchpad.net/bugs/1930527 > > [Impact] > Backlight can't be controlled on 5.11- version of kernel. > > [Fix] > The panel needs DPCD to get control of backlight on 5.11- kernel. > After 5.12 kernel introduced new Intel HDR backlight control, and it > works well on this panel. > Add quirk ID to enable DPCD on 5.11- kernel. > > Because upstream kernel already got a fix, this patch is not going > to linus's tree. it's only for 5.11- stable kernel. > This patch had been submitted to stable kernel twice, and got Acked > by maintainer too. But still not applied. > > Regression: > It adds ID to use DPCD AUX control, it should be safe as UBUNTU SAUCE patch > for other panels. > > [Test] > Vendor Verified on hardware, with this quirk backlight can be changed on > 5.11 kernel. > > [Where problems could occur] > The panel backlight may not be changed. > > Aaron Ma (1): > UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Samsung 16727 > panel > > drivers/gpu/drm/drm_dp_helper.c | 1 + > 1 file changed, 1 insertion(+) > > -- > 2.25.1 > > > -- > kernel-team mailing list > kernel-team@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/kernel-team
BugLink: https://bugs.launchpad.net/bugs/1930527 [Impact] Backlight can't be controlled on 5.11- version of kernel. [Fix] The panel needs DPCD to get control of backlight on 5.11- kernel. After 5.12 kernel introduced new Intel HDR backlight control, and it works well on this panel. Add quirk ID to enable DPCD on 5.11- kernel. Because upstream kernel already got a fix, this patch is not going to linus's tree. it's only for 5.11- stable kernel. This patch had been submitted to stable kernel twice, and got Acked by maintainer too. But still not applied. Regression: It adds ID to use DPCD AUX control, it should be safe as UBUNTU SAUCE patch for other panels. [Test] Vendor Verified on hardware, with this quirk backlight can be changed on 5.11 kernel. [Where problems could occur] The panel backlight may not be changed. Aaron Ma (1): UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for Samsung 16727 panel drivers/gpu/drm/drm_dp_helper.c | 1 + 1 file changed, 1 insertion(+)