After an extensive series of tests, we've determined that the following kernel config change is the root cause of the issue:
commit 682f607fd4a57d273db9ecc360589a8fa9cec8e6 Author: Andy Whitcroft <[email protected]> Date: Fri Jul 20 21:33:43 2012 +0100 UBUNTU: [Config] Enable CONFIG_DRM_AST/_CIRRUS_QEMU/_MGAG200 The above config change enabled the mgag200 driver which is described as follows: config DRM_MGAG200 tristate "Kernel modesetting driver for MGA G200 server engines" depends on DRM && PCI && EXPERIMENTAL select FB_SYS_FILLRECT select FB_SYS_COPYAREA select FB_SYS_IMAGEBLIT select DRM_KMS_HELPER select DRM_TTM help This is a KMS driver for the MGA G200 server chips, it does not support the original MGA G200 or any of the desktop chips. It requires 0.3.0 of the modesetting userspace driver, and a version of mga driver that will fail on KMS enabled devices. This driver is marked as EXPERIMENTAL. Our default config policy is to enable device specific experimental options to promote testing and feedback. However, should any experimental option produce adverse affects, we will disable them. As such, I've built a test kernel with CONFIG_DRM_MGAG200 disabled and we have confirmed this resolves the issue [1]. I've committed this change to the Quantal kernel git repository. It should be included in the subsequent 3.5.0-13.14 or newer upload. This however may unfortunately not land in time for the Quantal Beta-1 release. However, it will land well in advance of 12.10 being final. A temporary workaround aside from running the test kernel [1] is to blacklist the mgag200 driver. [1] http://people.canonical.com/~ogasawara/lp1039178/ ** Project changed: linux => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1042903 Title: mgag200 driver hangs on HP ProLiant Gen 8 platform To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1042903/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
