| Message ID | YUhseVXMsTJKAqF6@legolas.home.lovergine.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/1] drm: This patch fixes colour banding caused by wrong information passed by the Lenovo Thinkpad L540 panel. | expand |
On Thu, Sep 23, 2021 at 2:15 PM Francesco Paolo Lovergine <frankie@debian.org> wrote: > > Hi, The patch title is a little long. How about something like: drm: fix colour banding on Lenovo Thinkpad L540 panel > > there is an issue with Lenovo Thinkpad L540 very similar to those described here: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420 or here: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308 > that is a bad looking color banding with dark colors mainly. > It happens with any kernel starting from 4.8 up to the current. Bugs should be referenced like: Bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420 Bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308 Otherwise looks good to me. Alex > > Signed-off-by: Francesco Paolo Lovergine <frankie@debian.org> > --- > drivers/gpu/drm/drm_edid.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c > index 6325877c5fd6..48e06cc33e4d 100644 > --- a/drivers/gpu/drm/drm_edid.c > +++ b/drivers/gpu/drm/drm_edid.c > @@ -141,6 +141,9 @@ static const struct edid_quirk { > /* LGD panel of HP zBook 17 G2, eDP 10 bpc, but reports unknown bpc */ > { "LGD", 764, EDID_QUIRK_FORCE_10BPC }, > > + /* LGD panel of Lenovo L540 reports 8 bpc, but is a 6 bpc panel */ > + { "LGD", 0x038e, EDID_QUIRK_FORCE_6BPC }, > + > /* LG Philips LCD LP154W01-A5 */ > { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, > { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, > -- > 2.30.2 > > > -- > Francesco P. Lovergine
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 6325877c5fd6..48e06cc33e4d 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -141,6 +141,9 @@ static const struct edid_quirk { /* LGD panel of HP zBook 17 G2, eDP 10 bpc, but reports unknown bpc */ { "LGD", 764, EDID_QUIRK_FORCE_10BPC }, + /* LGD panel of Lenovo L540 reports 8 bpc, but is a 6 bpc panel */ + { "LGD", 0x038e, EDID_QUIRK_FORCE_6BPC }, + /* LG Philips LCD LP154W01-A5 */ { "LPL", 0, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE }, { "LPL", 0x2a00, EDID_QUIRK_DETAILED_USE_MAXIMUM_SIZE },
Hi, there is an issue with Lenovo Thinkpad L540 very similar to those described here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749420 or here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1788308 that is a bad looking color banding with dark colors mainly. It happens with any kernel starting from 4.8 up to the current. Signed-off-by: Francesco Paolo Lovergine <frankie@debian.org> --- drivers/gpu/drm/drm_edid.c | 3 +++ 1 file changed, 3 insertions(+)