Am 31.07.2014 12:23, schrieb Thierry Reding: > On Thu, Jul 31, 2014 at 10:57:55AM +0200, Andreas Färber wrote: >> Am 31.07.2014 10:38, schrieb Ajay kumar: > [...] >>> With just the spring-bridge.v6 branch of your own tree, I am able to see >>> bootup logo on Skate(a variant of spring which also contains ps8622). >>> I have tried both exynos_defconfig and multi_v7_defconfig. >>> I enable DRM, EXYNOS DRM, BRIDGE CHIPS, IOMMU, EXYNOS IOMMU >>> in configs. >>> >>> Even in your bootlogs, I can see DP getting probed. >>> And, you say backlight is also visible. That means entire display >>> path should be fine. Its just that you should start writing to the buffer. >>> Have you enabled boot logos? >> >> Let me clarify: U-Boot uses the display [*], so it is powered and I see >> penguins initially. Then, when drm gets initialized, the screen goes >> black and no longer prints kernel messages or systemd output or X11 gdm >> login screen. > > Who's displaying the penguins? If you're referring to the Linux boot > logo then it shouldn't be displayed at all until after DRM has been > initialized (and the framebuffer console been set up). Yes, I'm referring to the default boot logo, but before the boot messages (console=tty1) indicate that [drm] driver is being initialized. >> Since drm stuff is the only variance here and it works with simplefb, >> surely something prints to some buffer! > > If you have something like simplefb enabled in addition to a DRM driver, > then perhaps the DRM driver isn't properly taking over the framebuffer > console. Okay, that's worth a try. Around v4 of this series it was not a problem. Thanks, Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
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