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If the initial fbdev configuration (intel_fbdev_initial_config()) runs and there still no sink connected it will cause drm_fb_helper_initial_config() to return 0 as no error happened (but internally the return is -EAGAIN). Because no framebuffer was allocated, when a sink is connected intel_fbdev_output_poll_changed() will not execute drm_fb_helper_hotplug_event() that would trigger another try to do the initial fbdev configuration. So here allowing drm_fb_helper_hotplug_event() to be executed when there is no framebuffer allocated and fbdev was not set up yet. This issue also happens when a MST DP sink is connected since boot, as the MST topology is discovered in parallel if intel_fbdev_initial_config() is executed before the first sink MST is discovered it will cause this same issue. This is a follow-up patch of https://patchwork.freedesktop.org/patch/196089/ Changes from v1: - not creating a dump framebuffer anymore, instead just allowing drm_fb_helper_hotplug_event() to execute when fbdev is not setup yet. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104158 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104425 Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> Tested-by: frederik <frederik.schwan@linux.com> # 4.15.17 Tested-by: Ian Pilcher <arequipeno@gmail.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180418234158.9388-1-jose.souza@intel.com |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.