** Also affects: linux-raspi2 (Ubuntu Xenial) Importance: Undecided Status: New
-- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1708417 Title: Board hangs with 'dtoverlay=vc4-kms-v3d' while writing to /dev/fb0 Status in linux-raspi2 package in Ubuntu: New Status in linux-raspi2 source package in Xenial: New Bug description: Impact: There is a kernel hang in 4.4.y if the vc4 driver is enabled, and another program opens /dev/fb0 to display an image. Fix: Apply the attached patch and recompile the kernel. How to test: Enable the gpu hardware acceleration by loading the vc4 overlay: config.txt: ... dtoverlay=vc4-kms-v3d ... reboot and check that vc4 was activated: $ dmesg | grep vc4 ... [ 15.274385] vc4-drm soc:gpu: bound 3f902000.hdmi (ops vc4_hdmi_ops [vc4]) [ 15.274660] vc4_dsi 3f700000.dsi: DSI not set up by firmware. [ 15.274753] vc4-drm soc:gpu: bound 3f700000.dsi (ops vc4_dsi_ops [vc4]) [ 15.274873] vc4-drm soc:gpu: bound 3f400000.hvs (ops vc4_hvs_ops [vc4]) [ 15.275178] vc4-drm soc:gpu: bound 3f206000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 15.275407] vc4-drm soc:gpu: bound 3f207000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 15.275643] vc4-drm soc:gpu: bound 3f807000.pixelvalve (ops vc4_crtc_ops [vc4]) [ 15.275818] vc4-drm soc:gpu: bound 3fc00000.v3d (ops vc4_v3d_ops [vc4]) [ 15.403354] vc4-drm soc:gpu: fb0: frame buffer device ... then download and compile psplash: $ git clone git://git.yoctoproject.org/psplash $ cd psplash $ autoreconf --install $ ./configure $ make $ sudo ./psplash here the board should hang, pull the plug to get it back. Now install the patched kernel, and execute psplash again - the board will be fine, and a bitmap will be displayed on hdmi, ctrl+c to exit psplash. -- To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1708417/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp