From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux@arm.linux.org.uk (Russell King - ARM Linux) Date: Tue, 23 Jun 2015 21:41:54 +0100 Subject: mx6 hdmi resolution behaviour In-Reply-To: References: <20150623164443.GC7557@n2100.arm.linux.org.uk> Message-ID: <20150623204154.GD7557@n2100.arm.linux.org.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Jun 23, 2015 at 01:52:50PM -0300, Fabio Estevam wrote: > On Tue, Jun 23, 2015 at 1:44 PM, Russell King - ARM Linux > wrote: > > > If you have no connected connectors, then you get 1024x768: > > > > imx-drm display-subsystem: No connectors reported connected with modes > > [drm] Cannot find any crtc or sizes - going 1024x768 > > > > as that's what DRM defaults to when it has no other timing information > > available. > > Agreed, but after the cable is connected we could try to find a more > suitable timing? > > >> [ 16.310548] imx-ipuv3 2400000.ipu: videomode adapted for IPU restrictions > > > > I don't see this message booting on a Hummingboard with HDMI > > disconnected. > > I see this message in the following case: > > - Boot the board with HDMI disconnected > > - Connect the HDMI cable and then such message is displayed. I've just tried this (the HBi1 was booted previously with the HDMI socket disconnected). Just now, I turned the TV on, and then connected it to the HDMI. The TV reported a resolution of 1024x768, and the kernel log was silent. My guess would be that your HDMI sink is reporting slightly non-standard 1024x768 timings, which cause the IPU restrictions to be violated. Maybe dumping the EDID of the HDMI device would reveal this? # edid-decode < /sys/class/drm/card0-HDMI-A-1/edid might provide some hints? -- FTTC broadband for 0.8mile line: currently@10.5Mbps down 400kbps up according to speedtest.net.