Some CedarView VBT-s claim that there is a LVDS panel, while there is none. Specifically this happens on the Thecus N2800 / N5550 NAS models.
This commit adds a LVDS blacklist to deal with this and adds an entry for the Thecus NAS-es. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1665766 Signed-off-by: Hans de Goede <hdego...@redhat.com> --- drivers/gpu/drm/gma500/cdv_intel_lvds.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/gpu/drm/gma500/cdv_intel_lvds.c b/drivers/gpu/drm/gma500/cdv_intel_lvds.c index de9531caaca0..268643af114c 100644 --- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c +++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c @@ -572,6 +572,20 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev, return false; } +static const struct dmi_system_id cdv_intel_lvds_blacklist[] = { + { + /* Thecus N2800 and N5550 family NAS-es */ + .matches = { + DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), + DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Milstead Platform"), + DMI_EXACT_MATCH(DMI_BOARD_NAME, "Granite Well"), + /* BIOS version is CDV_T<version> X64 */ + DMI_MATCH(DMI_BIOS_VERSION, "CDV_T"), + }, + }, + {} +}; + /** * cdv_intel_lvds_init - setup LVDS connectors on this device * @dev: drm device @@ -594,6 +608,15 @@ void cdv_intel_lvds_init(struct drm_device *dev, int pipe; u8 pin; + /* + * Check blacklist for machines with BIOSes that list an LVDS panel + * without actually having one. + */ + if (dmi_check_system(cdv_intel_lvds_blacklist)) { + dev_info(&dev->pdev->dev, "System is on LVDS blacklist, skipping LVDS panel detection\n"); + return; + } + pin = GMBUS_PORT_PANEL; if (!lvds_is_present_in_vbt(dev, &pin)) { DRM_DEBUG_KMS("LVDS is not present in VBT\n"); -- 2.21.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
